Monday, October 20, 2014

Continuous Commissioning

Continuous Commissiong be a highly cost-effective means of obtaining significant energy savings across a variety of building types

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1. Background

2. Acronyms/Definitions
3. Business Case
4. Benefits
5. Risks/Issues
6. Success Criteria
7. Companies
8. Links
Building Lifecycle Operating Inefficiencies


1.Background
  • Buildings rarely perform as intended, resulting in energy use that is higher than anticipated. Buildings systems underperform for several reasons:
    1. They were never properly configured
    2. The design did not account for all sources of building efficiency
    3. The building is not properly maintained
    4. The use of the building has changed over time
    5. Just as a piano goes "Out of Tune", so do the systems that control a building. It is estimated by Texas A&M researchers that as much as 20% of the energy used in an average commercial building is waste associated with poorly commissioned systems.
  • Lawrence Berkeley National Laboratory (LBNL) and Texas A & M have done seminal work on the typical 10 percent to 30 percent 'drift' in energy consumption that can happen in just the first two years of building operation. The prescription for halting and reversing this drift is regular retro-commissioning. LBNL’s database of over 600 buildings representing around 100 million square feet of floor-space shows that the median whole-building energy savings for retro-commissioning is around 16 percent and the median ROI is 1.1 years.
  • Building commissioning has emerged as a strategy for remedying this problem in non-residential buildings. Commissioning is a systematic process of ensuring that all building systems perform interactively according to the contract documents, the design intent and the Owner’s operational needs. Retro-commissioning (RCx) is a single-instance commissioning of systems in an existing building.
  • 75% - 80% of the buildings that will exist in 2030 exist today and 150 Billion Sq.ft. of Existing Buildings in the U.S. will need to be renovated in the next 30 years. Retro commissioning play an important role in make our building stock energy efficient.
  • Continuous or Monitoring-Based Commissioning (MBCx) can also be thought of as monitoring-enhanced building operation that incorporates three components:
    1. Permanent energy information systems (EIS) and diagnostic tools at the whole-building and sub-system level
    2. Retro-commissioning based on the information from these tools and savings accounting emphasizing measurement as opposed to estimation or assumptions
    3. On-going commissioning to ensure efficient building operations and measurement-based savings accounting.
  • MBCx is a measurement-based paradigm which affords improved risk-management by identifying problems and opportunities that are missed with periodic commissioning.
    Buildings get out of synch so it has to be done again


2. Acronyms/Definitions
  1. AB1103 will require that all California non-residential buildings provide a performance rating of their operational energy performance at the time of sale or lease. Many public sector buildings are being required to benchmark on a continuous basis, with goals to reduce energy use annually. The California Energy Commission is drafting regulations. The original proposed draft regulations require the initial compliance to begin on January 1, 2011. However, new proposed draft regulations will postpone the initial compliance date until January 1, 2012.

  2. Advanced Reset - RCx to reset schedules of HVAC processes
    • Supply Air Temperature reset based on Outside Air Temperature
    • Corrections to fan/pump speeds
    • Lighting levels.

  3. Benchmark (or Benchmarking): When establishing ratings for the energy use and carbon emissions of buildings, the actual building’s energy or emission performance must be compared against some standard or benchmark. The benchmark can take the form of energy use of existing buildings from large data sets of measured energy use or, in the case of new buildings particularly, the benchmark may be a comparison of the simulation estimates of energy consumption against either existing building energy use or simulations of a baseline energy use relative to a particular building code or standard.

  4. BuildingSmart – The National Building Information Model Standard (NBIMS) rebranded to be more user friendly and international in scope.

  5. COBie - Construction Operations Building Information Exchange - Commissioning information. COBIE is that portion of BuildingSmart that defines the handover at the end of construction of building information to operations. COBIE also includes a framework for tying commissioning reports to the underlying systems from the design.

    Today, most contracts require the handover of paper documents containing equipment lists, product data sheets, warranties, spare part lists, preventive maintenance schedules, and other information. This information is essential to support the operations, maintenance, and the management of the facilities assets by the owner and/or property manager.

    Gathering this information at the end of the job, today's standard practice, is expensive, since most of the information has to be recreated from information created earlier. COBie simplifies the work required to capture and record project handover data.

    The COBie approach is to enter the data as it is created during design, construction, and commissioning. Designers provide floor, space, and equipment layouts. Contractors provide make, model, and serial numbers of installed equipment. Much of the data provided by contractors comes directly from product manufacturers who can also participate in COBie.

  6. Commissioning - Building commissioning is the process of ensuring, in new construction, that all the subsystems for HVAC, Plumbing, Electrical, Fire/Life safety, and Building Security are operating as intended by the building owner and as designed by the building architects and engineers. Building commissioning is a quality assurance process for the complexity of modern construction projects. Normally the commissioning firm is involved from project initiation to project completion. While the service methodology can vary from firm to firm and project to project, the basic formula for successful building commissioning involves a synergy of pre-construction review of design documents for compliance with the Owner's Performance Requirements (OPR), periodic site observations during the construction phase, and systems performance testing as the project nears completion. While the practice of building commissioning is still fairly new in the construction industry, it has quickly become common practice as savvy building owners and developers have seen substantial returns on their investment. The ultimate goal of the commissioning provider is to deliver for the owner a project that is on schedule and under budget, and a building with fully operational and optimized systems on day one.

  7. CCx - Continuous Commissioning - This term has been registered (SM) by Texas A&M University (TAMU), who defines it as “an ongoing process to resolve operating problems, improve comfort, optimize energy use and identify retrofits for existing commercial and institutional buildings and central plant facilities.” Specific commissioning protocols are also associated with the term.

  8. Datalogger - Measuring and recording devices. They include:
    • Signal receiver from sensor or transducer
    • Analog-to-digital converter
    • Data sampling rate
    • Data storage rate
    • Memory (stores readings)
    • Internal clock
    • Programming and data retrieval software
    • Computer interface
    • Microprocessor
    • Power supply

  9. Types of logers include:
    • Instantaneous - Represents just a moment in time. Typical of EMS systems
    • Averaging - Typical of data loggers, Data represents average value at end of interval
    • Change of State - Economical use of memory if changes are infrequent, Captures all cycling. Data represents value at beginning of interval.

  10. EIS - Energy Information Systems
  11. Equipment Staging - RCx that affect control settings for the availability or staging of duplicate equipment, e.g., Chiller staging and loading sequence or lead-and-lag pumping sequences.

  12. Loop Tuning - RCx that modify control loop parameters to improve control by reducing cycling, hunting, and oscillations.

  13. MBCx - Monitoring-Based Commissioning - The approach in the UC/CSU/IOU partnership. It involves three elements: 1) Energy Information Systems/Building Diagnostics; 2) Retro-commissioning; and 3) Ongoing commissioning and measurement-based savings accounting using the metered and monitored data.

  14. New-Construction Commissioning: Single-instance commissioning of the systems in a newly constructed building (or major building addition), applied from project inception to initial occupancy.

  15. Occupancy Determined Scheduling - equipment or lighting - RCx affecting the control of equipment availability as a function of building occupancy (e.g. lighting sweeps; temperature setbacks; morning warm-up).

  16. RCx - Retro-Commissioning - Single-instance commissioning of systems in an existing building.

  17. Re-commissioning: - Periodic commissioning of systems in an existing building to ensure that systems are operating as intended.

  18. RIN 1904 -- AC13 -  Final rule establishing criteria for federal agencies that choose to employ green building rating system issued by the U.S. Department of Energy (DOE). The rule covers new construction and major renovations of federal buildings, including certain residential construction, of $2.5 million or more beginning on October 14, 2015. The rule does not specify use of any particular certification system, but rather establishes criteria that promote energy-efficient building designs and that focus on energy and water management.

    The new rule sets a precedent for active energy and water management by requiring post-occupancy verification of the savings at least every four years. By mandating post-occupancy verification of energy and water savings on a regular basis, the government can be sure that its facilities are performing optimally. The new rule will have a significant impact on federal energy use, as one-third of the energy used by the federal government is in its buildings. The rule supports DOE's goal of reducing building energy use in the United States by 50 percent, as well as the Accelerate Energy Productivity 2030 partnership between DOE, the Alliance to Save Energy, and the Council on Competiveness to double U.S. energy productivity by 2030.

  19. >
  20. Sensors – Accuracy of entire measuring range maintained during heating and cooling control applications?

  21. Setpoint Modification (high VAV setpoint minimum, setpoint suboptimal) - RCx that modify the setpoint of a control loop. E.g., Supply air temperature setpoint, thermostat setpoint, or static pressure setpoint.

  22. Sequence of Operations - RCx that propose changes significant enough to be considered a major modification to the building’s existing sequence of operations.
3. Business Case
  • Despite its benefits, commissioning has yet to achieve widespread penetration – there is still considerable room for growth. A Smart Grid has the potential to accelerate the adoption of commissioning programs, and offers a new opportunity in the form of continuous commissioning.

  • A Smart Grid will allow automatic monitoring and proactive maintenance of end-use equipment, which can be an avenue for energy savings and reduced carbon emissions. Equipment is sometimes not properly commissioned when it is first installed or replaced.

  • With the two-way communications of a Smart Grid infrastructure in place, a utility could monitor the performance of major consumer equipment through advanced interval metering and on-premise energy management control systems. The utility would be able to send alerts to a facility energy manager to indicate if major equipment is not performing up to nameplate efficiency specifications. With this information in hand, the facility manager may then choose to either adjust the operational settings of existing equipment or replace sub-optimal equipment with more energy-efficient equipment to improve overall operational efficiency. Depending on the service agreement, the utility may also offer to send a representative to re-commission the equipment for a customer.

  • The result would be a greater degree of proactive maintenance that would benefit the customer by improving operation and reducing energy costs, and would benefit the utility by fostering enhanced customer relations and potentially reducing peak load. The energy savings would also equate to a reduction in carbon emissions.

Continuous commissioning provides three streams of additional energy savings in compared to one time RCx alone


4. Benefits
  • Energy Savings - Expected to be more robust and persistent for MBCx projects than for conventionally commissioned ones, due to the level of metering and monitoring. Retro commissioning can save 10 – 20% of building operating expenses. EPRI estimates that retro-commissioning could lead to an annual energy savings potential of 2.2 billion–8.8 billion kWh, depending on the level of market penetration. Experience shows that commissioning is particularly cost-effective in large commercial buildings (> 100,000 sf), and can yield overall energy savings of 15% (or 17 kBTU/sf-yr), and electricity savings of 9% (or 1.7 kWh/sf-yr).

  • Sustained Savings - Several studies have shown that RCx savings can degrade without an explicit effort to monitor and maintain them. Retro-commissioning is known to be vulnerable to persistence problems, and thus is a particularly good candidate for a measurement-based approach. Furthermore, certain commissioning opportunities cannot even be identified without the use of measurement.

  • Savings due to Trending Data - Savings from persistence and optimization of savings from RCx due to early identification of deficiencies through metering and trending. Savings from measures identified through metering and trending during the initial commissioning effort i.e. measures unlikely to be found from RCx alone. Examples include: poor control of chilled water distribution to air handlers; unnecessary chiller operation due to disabled chiller lockout; poor VAV zone control due to inoperative actuators on air dampers and hot water valves.

  • Identification of New Problems - Continually identified new measures. By virtue of the continuous nature of the monitoring, MBCx can identify new problems that emerge after the initial retro-commissioning investigation stage, such as equipment cycling and excessive simultaneous heating and cooling.

  • User Feedback - User behavior and motivation to reduce energy use is influenced by feedback on actual building performance.

  • Validate Green Building Projections - Too much anecdotal information suggests that a fairly large number of high-profile green buildings are using much more energy than their widely published projections. We desperately need more data on actual performance, with random samples, and comparisons of new green buildings to plain vanilla, standard construction buildings serving the same uses as those green buildings.

  • Validate Estimates - Current paradigms based on stipulated or estimated energy savings invite significant uncertainty and thus risk of under-attainment of goals. Shifting to a measurement-based strategy affords better risk-management and also helps to identify problems and opportunities that are missed when only engineering estimates are used.

Wireless technology retrofit can require 20% of the cost and 10% of the time compared to traditional DDC retrofit


5. Risks/Issues
  • Commissioning Only to Gain LEED Credit - The checklist-driven standardization to satisfy a commissioning requirement and attain an extra LEED credit is all too often a poor substitute for true “third-party verification.”

  • Gaming the System - Recently, there have been a couple of projects where owners pay for two sets of energy models: one to get the most LEED credits, and another with more realistic assumptions about operating conditions for budgeting their real expected energy costs. If this sort of “gaming” grows, our current modeling and reward system is setting perverse incentives. We’ve set expectations and incentives for energy modelers to predict idealized performance, regardless of what will really happen in the building when it’s built and occupied.

  • Ineffective Green Building Strategies - The lack of real, measured performance data on green buildings causes owners and their designers to operate in somewhat of a vacuum, often pursuing technologies and techniques that are not worthwhile.

  • Busy Facilities Managers - It may seem obvious, but the value of a dashboard tool is only as much as the time people are willing to take to use it and the ability of users to understand and follow up on the information they provide. Most facility managers’ time is almost always a triage of which of the daily emergencies is the greatest threat to their job. Once people are looking the other way, typically these folks will go back to the way they have always done things, unless there is deep expertise behind the dashboard to support them. Unfortunately this expertise is not to be found within most dashboard companies, principally because investors have failed to understand, or understand too late, that nothing scales in the building industry without good people.

  • Speculative ROI Baseline - LBNL’s database of over 600 buildings representing around 100 million square feet of floor-space shows that the median whole-building energy savings for retro-commissioning is around 16 percent and the median ROI is 1.1 years.

    What the LBNL study does not address is how many serious issues are actually discovered by  on-site facility folks who provide 'daily' maintenance. The question is, when? Sometimes issues are prevented before they happen through daily maintenance routines, or sometimes they are caught days, weeks or months later.

    The value of a dashboard is that it could reduce the time needed to discover problems.   Tetro-commissioning is designed to find issues that are assumed no one would ever have found in the course of a typical maintenance regime, or that would have at least remained undiscovered for a year or more.

    Rarely is enough due diligence performed pre-dashboard deployment to understand how well a building or portfolio is performing and therefore what can be saved. The only way an ROI can authoritatively be claimed is if there is perfect future knowledge about what would have happened anyway in the absence of the installation of the dashboard. Since this obviously is not possible, one can only conclude that most, if not all ROIs mentioned in the context of a purchase or sale are self-serving at best.

    For example, assume a dashboard helps identify a problem with a facility’s load profile. Upon further investigation, it is discovered that equipment has been running overnight unnecessarily because the building operator made an error when programming the building automation system. The problem gets resolved right away. How long would the equipment have continually run had the issue not been discovered? A day? A week? A month? Or would it occur until the next retro-commissioning occurs?  'ROI' would vary by up to three orders of magnitude depending on the answer.

    Further complicating the issue is that quite often buildings are not performing, or are not being operated, as designed/intended, which means that initial energy baselines established by the energy dashboard may overlook existing problems. Put another way, dashboards benchmark buildings against what is happening, not necessarily what should be happening. If, for example, when the energy dashboard is installed, a site has an air-handling unit that is not being turned off at the appropriate time, it may not exhibit enough energy waste to trigger an alarm. In this case, a typical dashboard would automatically establish an incorrect baseline and trigger an alarm only when energy consumption goes above that amount.

6. Success Criteria
  • Impacts of future programs can be maximized by benchmarking energy use and targeting the commissioning towards particularly energy-intensive facilities such as laboratories
Data logging shows how an Economizer is not bringing in outside air when it should
7. Companies
  1. Architectural Energy Corporation, Boulder CO, 27-year history of improving the performance of hundreds of new and existing buildings, as well as for its research that has shaped the industry's understanding of high-performance buildings. Provides sustainable design assistance and support with Leadership in Energy and Environmental Design (LEED) certification — as well as an expanded range of engineering services, including building commissioning, retro-commissioning, and measurement and verification.

    Acquired by UTC Power, a United Technologies Corp. (NYSE:UTX) in October 2008
    .
  2. Cimetrics, Boston, MA, Their Infometrics is the leading service for remote monitoring and ongoing commissioning of building systems. An Infometrics program provides powerful algorithm-based analysis of continuously collected building automation data. Valuable periodic reports enable owners to optimize efficiency and comfort, lower maintenance costs, and effectively manage facility staff and contractors. Provides data without direct controlling building management systems

  3. Scientific Conservation - San Francisco, CA - Makes tools for analyzing energy consumption in industrial and commercial buildings -- already has 15 million square feet under management. The company is racking up deals with large customers like General Electric, Boeing and Neiman Marcus. Provides data without direct controlling building management systems. Continuous commissioning, delivered by SCIwatch, provides
    1. A traceable, predictive and constantly up-to-date baseline of the energy consumption of the facility systems being monitored
    2. The most comprehensive diagnostics available in the market
    3. Prioritization of system anomalies
    4. Ongoing, real-world measurement of operational efficiency
    5. Predictive tools to accelerate responsiveness to operational degradation
    6. Continuous tracking of the service resolution proces
8. Links
  1. California Commissioning Collaborative - a non-profit 501(c)3 organization committed to improving the performance of buildings and their systems. The CCC is made up of government, utility and building services organizations and professionals who have come together to create a viable market for building commissioning in California.
  2. Lawrence Berkeley National Laboratory (LBNL) Building Commissioning Site 
    A Golden Opportunity for Reducing Energy Costs and Greenhouse-Gas Emissions
  3. LBNL - Monitoring Based Building Commissioning - This report documents an in-depth benchmarking analysis of energy savings from a portfolio of 24 Monitoring-based Commissioning (MBCx) projects designed to achieve energy and peak power savings in the University of California and California State University system buildings.
    • For the MBCx cohort, source energy savings of 22 kBTU/sf-year (10%) were achieved, with a range of 2% to 25%. Median electricity savings were 1.9 kWh/sf-year (9%), with a range of 1% to 17%. Peak electrical demand savings were 0.2 W/sf-year (4%), with a range of 3% to 11%.
    • The aggregate commissioning cost for the 24 projects was $2.9 million. We observed a range of normalized costs from $0.37/sf to 1.62/sf, with a median value of $1.00/sf for buildings that implemented MBCx projects. Half of the projects were in buildings containing complex and energy-intensive laboratory space, with higher associated costs.
    • A median simple payback time of 2.5 years was achieved for the portfolio.
    • The greatest absolute energy savings and shortest payback times were achieved in laboratory-type facilities. While impacts varied from project to project, on a portfolio basis we find MBCx to be a highly cost-effective means of obtaining significant program-level energy savings across a variety of building types. Energy savings are expected to be more robust and persistent for MBCx projects than for conventionally commissioned ones
  4. Lawrence Berkeley Lab - Building Commissioning: A Golden Opportunity for Reducing Energy Costs and Greenhouse-Gas Emissions - Cost-benefit Assessments
  5. Texas A&M System Energy Systems Lab - Continuous Commissioning - Based on Continuous Commissioning® results from more than 300 buildings, the average measured utility savings are about 20%, with simple paybacks typically occurring in less than two years. Continuous Commissioning® maintains long-term savings using ongoing monitoring of energy consumption with follow-up commissioning, as needed. It also improves system reliability and building comfort by optimizing system operation and control schedules based on actual building conditions, upgrades the operating staff's skills by allowing direct participation in the CC® process, and reduces O&M costs.
  6. EPRI – The Green Grid Electric Power Research Institute, The Green Grid: EPRI Report 1016905 (Palo Alto, CA: Electric Power Research Institute, 2007).
  7. UC/CSU/IOU MBCx Program - The University of California (UC), California State University (CSU), and Investor-Owned Utility (IOU) Energy Efficiency Partnership is a California-wide energy efficiency program that establishes a permanent framework for a long-term, comprehensive energy management program at the 33 UC and CSU campuses served by California's four large IOUs (PG&E, SDG&E, SCE and SoCalGas)
  8. CEC 2008. “Savings Persist with Monitoring-Based Commissioning” Technical Brief. California Energy Commission. CEC-500-2008-053-FS.
  9. SCE's RCx Program - Provides retro-commissioning services to large customers.
  10. Malin, N. 2008. "Lies, Damn Lies, and... (Another Look at LEED Energy Efficiency).” Posted Sept. 2, 2008, on BuildingGreen.com
  11. Greentech Media Guest Post: The Energy Dashboard Delusion, Part 1 &  Part2

Energy Codes & Smart Energy

Building energy codes are one of the easiest and most cost efficient ways for states and local jurisdictions to implement energy management policies.

Navigate this Report
Back to Energy Efficiency Index
1. Background
2. Acronyms/Definitions
3. Business Case
4. Benefits
5. Risks/Issues
6. Next Steps
7. Links

Sept 23, 2013 Update - Added to Definitions: S. 1392 (Shaheen D-NH/Portman R-OH) The Energy Savings and Industrial Competitiveness Act of 2013. This bill setting voluntary building codes, establishing industrial assistance program and ordering federal agencies to reduce their energy use was designed to be small, an effort to "put some points on the board," as Sen. Ron Wyden (D-Ore.) puts it-- and to demonstrate that the Senate could pass an energy bill for the first time since 2007. If it passed, supporters said, maybe that would herald hope for a new era of small-bore energy bills that could make it through a fractured Congress. However, it being held up by an unrelated amendment from Sen David Vitter (R-LA) to repeal Obamacare.
Status of State Commercial Energy Codes Source: DOE EERE as of April 5, 2012



1.Background
  • Energy codes can vary greatly from state to state and even from edition to edition of codes developed by the same authority. Some of the codes in place are state developed, and take into account state-specific concerns such as climate, the state's economy and history, and impact on local building communities. Many other states adopt state-specific amendments to the national model codes. The codes are not a static document and, while national model codes are published every 3 years, they are almost constantly under revision to improve compliance, implementation, and enforcement for everyone involved in the building process.

  • Energy codes generally provide two methods for compliance. The first, and most common method is referred to as the prescriptive approach. In this approach, a structure must be built to the prescribed insulation and other values found in the code. Trade-offs are allowed between certain building components that have different energy performances, giving an added degree of flexibility.

  • The alternative method of compliance is the performance approach. Using this process, a structure is allocated an energy budget, or total allowable energy use, and can use a combination of different insulation values and equipment efficiencies in order to meet this budget. The overall energy performance of the structure, and not the individual components, is what matters. For example, a builder can use less insulation but a more efficient furnace to meet the allocated energy budget for the structure.

  • Building a new power plant can cost over $2000 per each kilowatt it can produce. By comparison, each kilowatt saved by an investment in an energy-efficient building costs only about $300. Despite general agreement that energy efficient structures are a good thing, surprising obstacles remain. Building regulations in the US are localized in the US have created literally several thousand different code specifications which in essence fragment the construction market, contribute to manufacturing inefficiencies and increase costs.


2. Acronyms/Definitions
  1. ACH - Air Changes per Hour - Amout of outside air infultration or leakage in a building. Measured by a Blower Door test for envelope tightness at 50 pascals or 0.20 inches. Minimum of 0.35 ACH is required for IAQ (Indoor Air Quality) 2008 Title 24 requires mechanical ventilation on new residential construction.

  2. ASHRAE - American Society of Heating and Refrigeration and Air Conditioning Engineers - The organization that creates standards for building engineers.

  3. ASHRAE -IEC 90.1 Building Code - Many states use IEC 90.1 as a base for state specific amendments. Commercial building energy codes are based on ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings, jointly developed by ASHRAE and the Illuminating Engineering Society (IES). ASHRAE Standard 90.1 applies to all buildings, except residential buildings less than three stories, and provides minimum requirements for the design of energy efficient buildings. Recent work from ASHRAE has resulted in a series of new efficiency standards and Advanced Energy Design Guidelines.

  4. BBEES - Big Bold Energy Efficiency Strategy 
    1.  All new residential construction in California will be zero net energy by 2020;
    2.  All new commercial construction in California will be zero net energy by 2030;

  5. CalGreen -voluntary tiers intended for local government adoption
    • ‡ Tier 1 is one code cycle in advance of Title 24, Part 6 2016
      CALGreen Tier 1 should be ZNE
    • ‡ Tier 2 is two cycles in advance of Title 24, Part 6 - ƒ 2013
      CALGreen Tier 2 should be ZNE
  6. CALRES 2008 - A revised public domain compliance software for the 2008 Residential Building Energy Efficiency Standards. CALRES 2008 is now available for demonstrating compliance with the 2008 Standards for one zone, newly constructed residential buildings.

  7. Carbon Neurality - (aka net zero carbon footprint)- Achieving net zero carbon emissions by balancing a measured amount of carbon released with an equivalent amount sequestered or offset.Has become a goal because it can be directly measured. vs. legal lot line.

  8. ComCheck – Code compliance software for IECC and 90.1 Free download

  9. Compliance Options - There are several pathways to comply with Title24.
    1. Prescriptive Approach - Lists the minimum R-value or maximum U-factor requirements for each building component such as windows, walls, and roofs. This approach is quick and easy to use, but many users find it somewhat restrictive because the requirements typically are based on worst-case assumptions and all requirements must be met exactly as specified. The prescriptive approach allows quick review of the requirements.

    2. Trade-Off Approach - Allows you to trade enhanced energy efficiency in one component against decreased energy efficiency in another component. You can, for example, trade decreased wall efficiency (lower R-value) for increased window efficiency (lower U-factor), or increase the roof insulation and reduce or eliminate slab-edge insulation. Typically, this method is less restrictive than prescriptive approaches because components that exceed the requirements can compensate for those that do not meet the code. If these requirements are too restrictive, try a trade-off approach. For example, if the window area of the building exceeds that allowed by the prescriptive approach, a trade-off approach might work.

    3. Systems Performance Approach - Allows you to compare your proposed design to a baseline or reference design and demonstrate that the proposed design is at least as efficient as the baseline in terms of annual energy use. This approach allows greater flexibility but requires considerably more effort. A performance approach is often necessary to obtain credit for special features, such as passive solar design, photovoltaic cells, thermal energy storage, and fuel cells. This approach requires an annual energy analysis for the proposed design and the reference design. If nontraditional components are used or if energy use trade-off between building systems (e.g., envelope, mechanical) is desired, then use the performance approach.

  10. DEER - Database for Energy Efficient Resources. The DEER database has two pieces of information. It has measure costs but it also has estimated savings. We would not be using the estimated savings part of the database, just the, just the measure costs. This is a starting point. We expect that the HERS providers, and in fact it is the responsibility of the HERS providers, to periodically update this database on at least an annual basis. And they would do this by taking into account custom approach costs that are reported through their raters and other types of information.

  11. EPCA – Energy Policy and Conservation Act - Historically high oil prices and economic shocks that hit the United States prompted Congress to pass EPCA in 1975. One of the act's primary objectives was petroleum price regulation and allocation. In 1978, an amendment was passed requiring states receiving financial assistance from the federal government to initiate "mandatory programs and measures, including: energy conservation standards for new buildings".

  12. Energy Codes - A subset of building codes. Building codes are written legal requirements governing the design and construction of buildings. Most of the codes adopted by state and local governments set minimum standards for safe occupancy and to protect individuals from substandard living and working conditions. All building codes generally reflect a consensus of current design and construction practice. They are intended to lock in safe current practice as a minimum standard for design and construction of residential and commercial structures.

    Energy codes cover areas of construction such as wall and ceiling insulation, window and door specifications, Heating, Ventilation, and Air-Conditioning (HVAC) equipment efficiency, as well as lighting fixtures and controls. In some sense, energy codes are different compared to other building codes. They do not exist to protect the immediate health and safety of the building occupants in the same way as other codes. Implementing energy codes results in a reduced demand for energy.

  13. EISA 2007 - Energy Independence and Security Act of 2007 -  Established energy management goals and requirements while also amending portions of the National Energy Conservation Policy Act (NECPA).  EISA 2007 sets Federal energy management requirements in several areas, including:
  14. Energy Pro 5.0 - The latest version of Energy Pro, which has been updated to meet the ACM Manual requirements for compliance software for the 2008 Nonresidential Building Energy Efficiency Standards. The Energy Commission approved Energy Pro 5.0 on July 29, 2009. Energy Pro 5.0 is now available for demonstrating compliance with the 2008 Standards for nonresidential buildings, high-rise residential buildings and hotels and motels.

  15. Energy Star Building Rating- The national energy performance rating is a type of external benchmark that helps energy managers assess how efficiently their buildings use energy, relative to similar buildings nationwide. The rating system’s 1–100 scale allows everyone to quickly understand how a building is performing — a rating of 50 indicates average energy performance, while a rating of 75 or better indicates top performance. Becuase rating is based on percentile, when a building scores close to the median, small EUI changes result in a big change in score. Energy Star is normalized for occupancy hours and building use.
  16. EPAct 1992 - Federal Energy Policy Act of 1992 - EPAct amended the EPCA, establishing a role for the DOE to determine whether or not the 1992 Council of American Building Officials (CABO) Model Energy Code (MEC) and the ASHRAE Standard 90.1-1989 would improve energy efficiency for residential and commercial buildings respectively. This also applied to subsequent revisions of those codes, and is the basis on which DOE is required to make a determination within 12 months of the revision of the respective energy codes. Once a positive determination is published in the Federal Register, each state has 2 years to certify that it has made revisions to its own energy code, so that it meets or exceeds the requirements of the latest iteration of the national models. A state may decline to adopt a residential energy code by submitting a statement to the Secretary of the DOE, detailing its reasons for doing so. The CABO MEC was last promulgated in 1995 and has since been replaced by the International Energy Conservation Code (IECC).

  17. EPACT 2005 - Federal Energy Policy Act of 2005.
    • New ballast efficiency standards,
    • set criteria for up to $0.0225 per SF tax deduction for efficient buildings
    • Tax deduction of $0.60 per sf for lighting systems that are 40% better than 90.1-2001 and have dual level switching.

  18. Executive Order 13514 - Federal Leadership in Environmental, Energy, and Economic Performance This Oct 5, 2009,  executive order mandates that at least 15 percent of existing federal buildings and leases meet Energy Efficiency Guiding Principles by 2015, and that annual progress be made toward 100 percent conformance of all federal buildings, with a goal of 100% of all new federal buildings achieving zero-net-energy by 2030. The U.S. government is the largest consumer of energy in America. It has roughly 500,000 buildings, and most of these buildings are energy-inefficient. Fifteen percent of 500,000 buildings is 75,000 buildings.

    • Green roofs are explicitly recommended for government buildings.

    • Zero-net-energy goals are to be incorporated into the process of buying or leasing new government properties.

    • As of 2020, all planning for new Federal buildings requires design specifications that achieve Zero-Net-Energy use by 2030.

    • Large government buildings have to start showing progress by 2015. More specifically, at least 15 percent of any agency's existing buildings and building leases above 5,000 gross square feet must conform to Zero-Net-Energy by Fiscal Year 2015. Ongoing improvement is required.

    • Historic buildings may be retrofit to comply with the order.


  19. Federal Building Energy Codes - The final rule was issued on December 21, 2007, and became effective on January 22, 2008. The interim final rule was published on December 4, 2006, and became effective January 3, 2007. The new requirements are based on ANSI/ASHRAE/IESNA Standard 90.1-2004. View 10 CFR 433

    The final rule also establishes a requirement for new Federal buildings to achieve a level of energy efficiency 30% greater than 90.1-2004 when life-cycle cost-effective. If the additional 30% savings is not life-cycle cost-effective, an agency must evaluate the cost-effectiveness of alternate designs at successive decrements below 30% (e.g., 25%, 20%, etc.) in order to identify the most life-cycle cost-effective design for that building.

  20. GreenTRIP - Rates how well a project encourages sustainable transportation options. Most green certification programs such as the U.S. Green Building Council’s LEED certification or the U.S. Environmental Protection Agency’s Energy Star rankings look at a building’s systems and materials while GreenTRIP focuses just on transportation.

    GreenTRIP provide a one-page scorecard that shows whether the developer is doing much more to ensure transportation for the life of a project and is sponsored by TransForm, a Bay Area group that advocates public transportation and walkable communities.

    Projects receive points for having features such as bike racks, proximity to bike lanes and public transportation and for providing transit passes and car-sharing access to residents for 40 years. Other programs, such as LEED, reward points for projects that provide car sharing and transit passes for three years. The new program also rewards developers who require buyers or renters to pay separately for a parking spot instead of including it in the purchase price of the unit or the rent.

  21. HERS- Home Energy Rating System - HERSII Objectives
    • Guiding the production of consistent, accurate, and uniform ratings based on a single statewide rating scale
    • Ensuring that any audit or rating include reasonable estimates of potential utility bill savings and reliable recommendations on cost-effective measures to improve energy efficiency
    • Establishing labeling procedures that will meet the needs of home buyers, homeowners, renters, the real estate industry, and mortgage lenders with an interest in home energy ratings
    • Proposing a technique for determining energy efficiency measure cost-effectiveness
    • Proposing a technique to develop recommendations for energy efficiency improvements, including cross checking against utility bills,

  22. HERS Index - The index is the ratio of TDV energy of the rated house to the time-dependant valued energy of a reference house. So on this scale zero would represent a net zero home. One hundred would represent, would indicate that your home is complying or uses the exact same energy as the reference home.

  23. IECC – International Energy Conservation Code – Energy code Introduced in 2000 as a streamlined code for both commercial and residential. Part of the family of International Codes developed by the International Code Council, a widely recognized building code development organization. The IECC is applicable to all residential and commercial buildings and provides the minimum energy efficiency provisions for residential and commercial buildings. The code contains building envelope requirements for thermal performance and air leakage while making allowances for different climate zones. Because it is written in mandatory, enforceable language, state and local jurisdictions can easily adopt the model as their energy code.

  24. IECC 2012  This package of code changes will achieve a 30 percent goal in the increase in energt savings in both residential and commercial buildings compared to its 2006 predecessor.  The vote was part of the International Code Council's (ICC's) final action hearings, which were held October 27-31, 2010 in Charlotte, North Carolina.

    Residential Changes

    • A mandatory air infiltration test in all homes to ensure building envelope efficiency
    • A requirement that ducts be tested to a tighter duct leakage standard
    • An increase in stringency for insulation and glazing efficiency requirements
    • A set of options to solve the problem of "stranding"–and therefore wasting–heated water: keeping pipes "short and skinny," or insulating them to avoid waste
    • The elimination of a former duplication of model energy codes between the IECC and the International Residential Code, streamlining the process into a singular, efficient path to residential compliance
    Non-Residential Changes

    • Comprehensive revisions to IECC's Chapter 5, including the compliance option to choose between high performance lighting, high performance HVAC equipment, or onsite renewable power generation
    • More efficient air leakage requirements by requiring continuous air barriers for the building envelope
    • A commissioning requirement for HVAC systems
    • Increased efficiency of the opaque thermal envelope provisions
    • Increased fenestration efficiency
    • Mandated automatic daylighting controls for buildings with a window-to-wall ratio over 30%
    • A requirement for skylights and daylighting controls for spaces over 10,000 ft2 in certain building types
    • Added efficiency requirements for cooling towers
    • Increased minimum efficiency requirements for certain HVAC equipment
    • Increased HVAC piping insulation provisions

  25. IECC 2009 has new requirements in building envelope tightness, duct testing, lighting equipment, pool controls and covers, and snow melt controls compared to the 2006 version. According to the DOE, the 2009 IECC will produce approximately 15% in energy efficiency gains compared to the 2006 edition. Smart provisions include:
    • In the 2009 Residential Standard, if primary heating system is a forced-air furnace, then at least one programmable thermostat/dwelling unit is required
    • Capability to set back or temporarily operate the system to maintain zone temperatures down to 55ºF (13ºC) or up to 85ºF (29ºC)
    • Initially programmed with heating temperature set point no higher than 70ºF (21ºC) and cooling temperature set point no lower than 78ºF (26ºC)

  26. Green Globes - A building assessment and rating system

    The genesis of the system was the Building Research Establishment's Environmental Assessment Method (BREEAM), In 1996, the Canadian Standards Association (CSA) published BREEAM Canada for Existing Buildings.

    The Green Globes system is used in Canada and the USA. In the USA, Green Globes is operated by the Green Building Initiative (GBI). In Canada, the version for existing buildings is operated by BOMA Canada under the brand name 'BOMA BESt'. The Green Globes system has also been used by the Continental Association for Building Automation (CABA) to power a building intelligence tool, called Building Intelligence Quotient ( BiQ).

    Green Globes is being supported as an alternative to LEED by trade industry associations due in large part to proposed LEED v4 integration of EU's REACH standards and credits for disclosure of chemicals in products and avoidance of chemicals of concern.

  27. LEED – Leadership in Energy Efficiency and Environmental Design - Product of US Green Building Council. Increasingly important on commercial and institutional projects. Points based system.

  28.  LEED v4 - Launched in November, 2013.

    USGBC is placing a greater focus on data collection. In the past, LEED hasn't fully collected and analyzed data on things like energy and water savings, reduced runoff or air quality. This new emphasis on building performance management will also help the long-term success of LEED certified projects. Building owners will be encouraged to maintain their buildings better, so that investments in green tech reach their full potential in the energy savings or other benefits

    To help projects reach a higher standard of sustainability, LEED v4 also introduces new "impact categories," which are climate change, human health, water resources, biodiversity, green economy, community and natural resources.

    New building types include: data centers, warehouses and distribution centers, hospitality, existing schools, existing retail and mid-rise residential projects.

    LEED credit submittal requirements have been simplified, descriptive step-by-step reference guide materials with videos and tutorials, and a more intuitive technology platform have been added.

    Among the biggest changes are those in the Materials and Resources (MR) category. Even though this category carries relatively few points (about 10% of the total in most Building Design & Construction rating systems), it has the most direct impact on major building material markets with their associated economic and ecological impacts, so this category is a lightening rod for controversy.

    LEED v4 rewards both disclosure of chemicals in products and avoidance of chemicals of concern in its new credits.

    USGBC has stuck with its strong commitment to the Forest Stewardship Council as the minimum standard for wood product certification. It has, however, backed off in the May 2012 draft from a credit that included PVC—the plastic most widely used in buildings—among the substances to be avoided. That’s a function of a decision to reference the European REACH list for that credit. PVC remains among the substances that would have to be disclosed, based on the lists in Clean Production Action’s Green Screen Benchmark.

    LEED V4 introduces a more sophisticated approach to many of the materials credits, replacing simple proxies for environmental benefit, such as recycled content and rapidly renewable materials, with requirements that call for life-cycle assessment, disclosure of ingredients, and avoidance of problem chemicals.

    These new approaches are challenging because tools and protocols for meeting these requirements are not yet widely available. USGBC is responding to this situation in several ways:
    • Introducing a pilot projects program and extended phase-in period for all of LEED 2012, so that only project teams that want to knock themselves out pioneering these new practices have to do so;
    • Pointing out that building commissioning and energy modeling were also not widely used when LEED began requiring them in 2000, so there is precedent for LEED creating this kind of infrastructure; and, to support that process,
    • Offering credit in some cases for merely reporting on ingredients and LCA results, regardless of how good those results are. This approach amounts to a big vote for transparency and support for developing data sources and tools, in the hopes that future versions of LEED will be able to make use of widely available data to set rigorous thresholds.
    • Using the EU's REACH standard as a base (which is creating political problems of its own)
    • The USGBC responds that it is not a standard-setting organization; it gathers the best third-party standards in order to transform the market in the service of healthy and sustainable built environments. Unfortunately, on the subject of safer chemicals, there is no equivalent U.S. standard to REACH.
    While the methods are far from perfect, moving to include mining impacts in the mix, and introducing some filters to the old blanket endorsement of any rapidly renewable material, are clearly big steps forward. Similarly, in the arena of indoor pollutants from materials, USGBC has determined that the market is finally ready to move from documenting VOC content to measuring VOC emissions. A letter, dated May 18 and signed by 60 members of Congress, accuses USGBC of transforming LEED into a “tool to punish chemical companies and plastics makers” and says adding the REACH program to the LEED system would give U.S. manufacturers no voice in changes to the program’s requirements. The letter urges GSA’s administration to discontinue its use of the LEED rating system as a guide for construction or major renovations in federal buildings if USGBC does not reconsider “these harmful provisions in LEED 2012.” In comments submitted to USGBC, the American Coatings Association (ACA) said inserting the REACH program into the LEED rating system would present major compliance complications. Among other comments, ACA made the following observations.
    • REACH is a complex chemical risk-management program that would present major compliance issues for U.S. building-materials suppliers and other parties with ties to building construction and renovation. Manufacturers currently face the task of complying with domestic regulatory requirements, and bringing the REACH program into the picture would add a whole new set of regulatory requirements.
    • REACH presents a particularly difficult challenge for companies that do not currently export products to Europe and are not versed on the REACH program. This would disrupt the market and could severely limit the range of products that can be used while still meeting the LEED 2012 credit criteria.
    • ACA also said USGBC has failed to give materials suppliers and other interested “stakeholders” adequate opportunity to participate in the credit-development process, with REACH added as criteria for credits only recently, at the time the fourth and final comment period was announced; the comment period began May 1.
    • ACA urged USGBC to completely eliminate the credit category for avoidance of chemicals of concern, based on the reasons cited in the comments. The association also said proposed disclosure criteria for “chemicals of concern” would reveal proprietary information about products, a crucial issue for makers of formulated products that rely on technology advances to compete in the marketplace.
    • ACA also called for revisions in several other parts of the LEED 2012 draft, including emissions testing for low-emitting interior products. Emissions testing as opposed to content requirements is not a practical or viable approach, and would adversely affect the availability of needed products that can comply with such testing, the association said.
    • Demand Response is now Base LEED Credit in Version 4 -

      • Enroll in minimum of one-year manual demand response program with an ISO, utility or curtailment service provider for 10 percent of estimated peak demand or a minimum of 20kW.
      • If demand response isn’t available, you can simply put a plan in place to take advantage of it, or dynamic pricing plans, when it becomes available, although it is unclear whether this can score any actual credit.
      • The second option is to have semi- or fully automated demand response for at least 10kW or 5 percent of peak electricity, although it still must meet a 10 percent load shed requirement overall. Semi-automated demand response -- which is defined by USGBC as a real person implementing an automated, pre-programmed DR plan (rather than someone shutting stuff off manually) -- was specified as being separate from a fully automated system.

  29. MEC - Model Energy Code - Predecessor to the IECC

  30. Perform 2008 - The revised public domain compliance software for the 2008 Nonresidential Building Energy Efficiency Standards. PERFORM 2008 is now available for demonstrating compliance with the 2008 Standards for nonresidential buildings, high-rise residential buildings and hotels and motels.

  31. QII - Quality Insulation Installation - Under Title24, a compliance credit is offered when QII procedures is followed for SPF application in low rise-residential buildings and verified by a qualified HERS rater.

  32. REACH - a European Union Regulation that addresses the production and use of chemical substances, and their potential impacts on both human health and the environment. It is the strictest law to date regulating chemical substances and will affect industries throughout the world. REACH entered into force in 1 June 2007, with a phased implementation over the next decade.

    When REACH is fully in force, it will require all companies manufacturing or importing chemical substances into the European Union in quantities of one tonne or more per year to register these substances with a new European Chemicals Agency (ECHA) in Helsinki, Finland. Since REACH applies to some substances that are contained in objects (articles in REACH terminology), any company importing goods into Europe could be affected.

  33. Reach Codes -  Local ordinances (reach codes) prepare the market in advance of statewide standards.
    • Unvented Attic option 
    • Compressorless Comfort Home

  34. REScheck – DOE Residential Compliance Software Tool - The REScheck materials have been developed to simplify and clarify code compliance with the Model Energy Code (MEC), the International Energy Conservation Code (IECC), and a number of state codes. The REScheck residential compliance materials offer two ways to demonstrate compliance: the trade-off approach and the prescriptive packages approach.

  35. RIN 1904 -- AC13 -  Final rule establishing criteria for federal agencies that choose to employ green building rating system issued by the U.S. Department of Energy (DOE). The rule covers new construction and major renovations of federal buildings, including certain residential construction, of $2.5 million or more beginning on October 14, 2015. The rule does not specify use of any particular certification system, but rather establishes criteria that promote energy-efficient building designs and that focus on energy and water management.

    The new rule sets a precedent for active energy and water management by requiring post-occupancy verification of the savings at least every four years. By mandating post-occupancy verification of energy and water savings on a regular basis, the government can be sure that its facilities are performing optimally. The new rule will have a significant impact on federal energy use, as one-third of the energy used by the federal government is in its buildings. The rule supports DOE's goal of reducing building energy use in the United States by 50 percent, as well as the Accelerate Energy Productivity 2030 partnership between DOE, the Alliance to Save Energy, and the Council on Competiveness to double U.S. energy productivity by 2030.

  36.  S. 1392 (Shaheen D-NH/Portman R-OH) The Energy Savings and Industrial Competitiveness Act of 2013.
    Reported by Committee May 08, 2013, has not passed Senate as of Mar 1, 2014.

    The chemical industry is lobbying vigorously under the guise of the “American High-Performance Building Coalition“ to insert an innocuous-sounding provision into the Senate’s Shaheen-Portman energy efficiency bill (S.761) that would prevent the U.S. government from using LEED. They are concerned about one or two points out of 100 that would reward the use of healthier building materials and have longer term fears about the precedent and what might become mandatory.

    This bill setting voluntary building codes, establishing industrial assistance program and ordering federal agencies to reduce their energy use was designed to be small, an effort to "put some points on the board," as Sen. Ron Wyden (D-Ore.) puts it-- and to demonstrate that the Senate could pass an energy bill for the first time since 2007. If it passed, supporters said, maybe that would herald hope for a new era of small-bore energy bills that could make it through a fractured Congress. However, it was held up by an unrelated amendment  from Sen David Vitter (R-LA). to repeal Obamacare.

    Bill summary from the Congressional Research Service, a nonpartisan division of the Library of Congress:

    Amends the Energy Conservation and Production Act to direct the Secretary of Energy (DOE) to:
    1. Support the development and updating of national model building energy codes for residential and commercial buildings to enable the achievement of aggregate energy savings targets established by this Act,
    2. Encourage and support the adoption by states and local governments of building energy codes that meet or exceed the national codes, and
    3. Support full compliance with state and local codes.

    Directs the Secretary to provide grants to establish building training and assessment centers at institutions of higher learning to identify and promote opportunities, concepts, and technologies for expanding building energy and environmental performance.

    Requires the Secretary to make grants to eligible nonprofit partnerships to pay the federal share of career skills training programs to help students obtain a certification to install energy efficient buildings technologies.

     Amends the Energy Independence and Security Act of 2007 to:
    1. Replace references to the energy-intensive industries program with references to the future of industry program, and
    2. Reduce the amount authorized to be appropriated for the Zero Net Energy Commercial Buildings Initiative for FY2015-FY2018.


    Requires the Administrator of the Small Business Administration (SBA) to expedite consideration of applications from eligible small businesses for loans under the Small Business Act to implement recommendations of industrial research and assessment centers.


    Amends the Energy Policy and Conservation Act to require the Secretary:
    1. As part of the Office of Energy Efficiency and Renewable Energy, to conduct on-site technical assessments at the request of a manufacturer to identify opportunities for maximizing the energy efficiency of industrial processes and cross-cutting systems, preventing pollution and minimizing waste, improving efficient use of water in manufacturing processes, and conserving natural resources;

    2. As part of DOE's industrial efficiency programs, to carry out an industry-government partnership program to research, develop, and demonstrate new sustainable manufacturing and industrial technologies and processes that maximize the energy efficiency of industrial systems, reduce pollution, and conserve natural resources.

    Establishes within DOE a Supply Star program to identify and promote practices, recognize companies, and recognize products that use highly efficient supply chains that conserve energy, water, and other resources. Directs the Secretary to establish a rebate program for expenditures for the purchase and installation of:
    1. A new constant speed electric motor control that is attached to an electric motor and reduces motor energy use by at least 5%; and

    2. Commercial or industrial machinery or equipment that is manufactured and incorporates an advanced motor and drive system that has greater than one horsepower into a redesigned machine or equipment that did not previously make use of the system or was previously used and placed back into service in 2014 or 2015 that upgrades the existing machine or equipment with such system.

    Directs the Secretary to establish a rebate program for expenditures made by owners of industrial or manufacturing facilities, commercial buildings, and multifamily residential buildings for the purchase and installation of new energy efficient transformers. Terminates the program on December 31, 2015.

     Directs the Secretary to issue guidance for federal agencies to employ advanced tools promoting energy efficiency and energy savings through the use of information and communications technologies.

    Authorizes the Administrator of the General Services Administration (GSA), for any building project for which congressional approval has been received and the design has been substantially completed, but the construction of which has not begun, to use appropriated funds to update the building's design to meet energy efficiency and other standards for new federal buildings.

     Requires the Administrator for the Office of E-Government and Information Technology within the Office of Management and Budget (OMB) to develop and publish a goal for the total amount of planned energy and cost savings and increased productivity by the government through the consolidation of federal data centers during the next five years.

  37. SLA - Specific Leakage Area - Effective Leakage Area (ELA expressed in square centimters) divided by the floor area (expressed in square meters)

  38. TDV - Time Dependent Valuation - Measures savings from energy efficiency standards at times of peak.

  39. Title 24 –Part 6 is the California Energy Code - The Standards contain energy efficiency and indoor air quality requirements for newly constructed buildings, additions to existing buildings, alterations to existing buildings and in the case of nonresidential buildings, repairs to existing buildings. Cost effective with a 7 year payback - The 1974 Warren Alquist act created the Energy Commission in and gave authority to develop and maintain Energy Efficiency Standards. The legislation requires that the Standards be cost effective when taken in their entirety and amortized over the economic life of the structure and that the Energy Commission periodically update the Standards and develop manuals to support the Standards (about every 3 years).

  40. Title 24 2013

    Implementation has been postponed to July 1, 2014. This update to the code require single family residential buildings to be 25%, multi-family to be 14% and non-residential buildings to be 30% more energy efficient than the previous 2008 standard. Major changes include:
    • Building Envelope
      • Glazing - U 0.32/ SHGC 0.25
      • Insulation/cool roofs  - Wall Insulation R15 or R21+4 - Ceiling R30 or R38, Std - Roof Deck Insulation R4 or R8 in some CZ's. - Roof Reflectance (Tile Roof) 0.2
      • Infiltration - (ACH50)  7.6 - Radiant Barrier/ Roof Ventilation  RB/300
    • System Efficiency
      • HVAC - WHF in cooling dominated CZ - Night-Ventilation Systems
      • Ducts - Duct Insulation R6 or R8 - Duct Ceiling & Testing Reqd.
      • DHW - Compact design
    • Verification of proper installation
      • QII - Required.
      • HERS inspections
    • Equipment/Plug loads
      • Lighting - ;High efficacy lighting in kitchens and bathrooms - Credit for 'higher-efficacy' lighting - Outdoor lighting controls
      • Upgradeable Thermostats
    • Renewables
      • Solar (PV) Ready Houses
      • Solar Oriented Development

  41. ZNE - Zero Net Energy - A popular term to describe a buildings use with zero net energy consumption and zero carbon emissions annually.  The amount of energy provided by on-site renewable energy sources is equal to the amount of energy used by the building.  A ZNE building may also consider embodied energy – the quantity of energy required to manufacture and supply to  the point of use, the materials utilized for its building.

    Zero energy buildings can be used autonomously from the energy grid supply – energy can be harvested on-site usually in combination with energy producing technologies like Solar and Wind while reducing the overall use of energy with extremely efficient HVAC and Lighting technologies.

    California has a ZNE goal for new homes by 2020 and commercial buildings by 2030. The ZNE goal means that new buildings must use a combination of improved efficiency and distributed renewable generation to meet 100 percent of their annual energy need.

    There is not a consensus on exactly what ZNE means.  Questions include:
    1. How is energy valued for trade-offs between different sources (natural gas, propane and electricity) and trade-offs with on-site renewable generation? Site, source, TDV? 
    2. What energy consumption is included?  Building operation, T-24 regulated only, embedded, transportation  energy etc.?
    3. What is on-site renewable energy  PV, hydro, fuel cells, biomass, landfill gas?
    4. What is on-site?   Building site, development site, utility grid etc? 
    5. How does definition or policy address sites that do not have access to renewable energy?

  42. Status of State Residential Energy Codes   Source: DOE EERE as of April 5, 2012    
    3. Business Case
    • According to the U.S. Department of Energy (DOE), the nation’s buildings account for more than 70 percent of total U.S. electricity use and roughly 40 percent of the nation’s total energy bill at a cost of $400 billion dollars per year. With 20 percent or more of this energy wasted, comparable reductions in energy could save an estimated $80 billion annually.

    • The California Energy Commission adopted the 2013 Building Energy Efficiency Standards (Title 24, Parts 1 and 6) on May 31, 2012, and they will become effective on July 1, 2014.  The updates are expected to cut energy use 25 percent in new homes, 30 percent in  new commercial buildings and 14 percent in multifamily residences. Changes include:

      Residential:

      1. Solar-ready roofs to allow homeowners to add solar photovoltaic panels at a future date. Provides an area on roof that is penetration and shade free. Exceptions include reduced solar zone area with demand response thermostat and no solar zone with high efficacy lighting and DR thermostat
      2. More efficient windows to allow increased sunlight, while decreasing heat gain
      3. Insulated hot water pipes, to save water and energy and reduce the time it takes to deliver hot water
      4. Whole house fans to cool homes and attics with evening air reducing the need for air conditioning load.
      5. Air conditioner installation verification to insure efficient operation. Improper installation of cooling systems reduces its efficiency. Having the installation verified by an independent inspection guarantees your air conditioner will operate as efficiently as designed


      Nonresidential:

      1. High performance windows, sensors and controls that allow buildings to use "daylighting"
      2. Efficient process equipment in supermarkets, computer data centers, commercial kitchens, laboratories, and parking garages
      3. Advanced lighting controls to synchronize light levels with daylight and building occupancy, and provide demand response capability
        • Occupant Controlled Smart Thermostat
        • Setback thermostat plus communications and demand response capable
        • Communications and DR can be built‐in or thermostat can be
          upgradeable with modular components
        • Communications Communications can can bebe turned turned on/off on/off byby occupant occupant
        • Optional enrollment in DR services and programs enabled
        • Occupant Occupant always always has has full full control control of of settings settings
      4. Solar-ready roofs to allow businesses to add solar photovoltaic panels at a future date
      5. Cool roof technologies Lighter colored roofing material re ects more of the sun’s heat energy away from the building. This reduces a bulding’s electricity bill by decreasing the amount of air conditioning required.
      6. High efficiency heating and cooling equipment To improve indoor comfort and reduce energy use, variable speed HVAC systems ef ciently match a building’s heating and cooling requirements to the building’s electricity budget

    • The California Energy Commission adopted the 2008 Building Energy Efficiency Standards (Title 24, Parts 1 and 6) on April 23, 2008, and they became effective on January 1, 2010. Smart Grid, Building Information Modeling and Building Control related changes include:
      1. Revisions and clarifications to Section 119, Mandatory Requirements for Lighting Control Devices
      2. Revisions and clarification to Sections 130-134, Mandatory Requirements for Lighting Systems and Equipment related to Luminaire Power determination, sign lighting controls, and other clarifications
      3. Updates for compliance to require side-lighting (§131) and day-lit areas near windows, change definition of daylit area and requirements for daylighting controls. Update skylight requirements to include smaller buildings (8,000 sf vs 25,000 sf), buildings with 15 ft ceiling heights (§143(c))
      4. Add requirements for occupant sensors in new indoor areas including small offices, multipurpose rooms less than 1,000 sf, classrooms, and conference rooms (§132(d))
      5. Revising the Lighting Power Densities (LPDs) for Complete Building Method Type of Use categories and Area Category Function Areas for indoor lighting (§146)
      6. Update indoor lighting requirements for Tailored Method, including wall and floor display lighting, and revised LPDs based on metal halide (§146)
      7. Compliance credit for high efficacy load shedding ballasts to reduce energy use when signaled (§146)
      8. Demand response controls to reduce indoor lighting when signaled (§146)
      9. Update Time Dependent Valuation (TDV) to measure savings from energy efficiency standards at times of peak
      10. Refine acceptance testing requirements to ensure HVAC works properly, allow compliance credit for automatic fault detection diagnostic systems (NA7)
      11. New controls requirements for single-zone variable (adjustable) air volume equipment (§122)
      12. Expand direct digital
      13. control systems to zone level for HVAC systems, including demand shedding controls, hydronic pressure reset, VAV zone minimums, demand control ventilation, and supply air temperature reset (§121)
      14. Improve roof and attic modeling - Unconditioned Zone Model (UZM) - to better model thermal interactions in attic such as radiant barriers, cool roofs, and ducts
      15. Improved cross-flow prevention and pump protection for central hot water distribution systems in multifamily buildings with demand-control circulation loops (§113)
      16. Distributed Energy Storage as a new residential compliance option
      17. New Nonresidential Compliance Options
        a. Fault Detection And Diagnostics For Air Handler Units, VAV, and Rooftop Units
        b. Thermal Energy Storage
    4. Benefits 5. Risks/Issues
    • Challenges to LEED - A new coalition, the American High-Performance Buildings Coalition, is challenging the LEED rating system as the dominant standard for buildings.  The coalition includes about 20 building industry trade organizations from the Adhesive and Sealant Council (ASC) to the  Vinyl Siding Institute (VSI).  

      The group is lobbying the U.S. General Services Association (GSA), which requires the LEED standard for all federal buildings, to reconsider, opting instead to require the Green Globes standard  They point to a March 2012 GSA study that shows that Green Globes aligns with more of the federal sustainability requirements than any other green building rating system for new construction – including LEED.

      The GSA study evaluated and compared 180 third‐party green building certification systems for new construction, taking into account criteria outlined in the Guiding Principles for Federal Leadership in High Performance and Sustainable Buildings. The GSA commissioned the study in accordance with requirements set forth in the Energy Independence and Security Act of 2007 Section 436(h) to identify tools that could help federal agencies comply with the requirements mandated in Executive Order 13514 issued in 2009.

      New Construction

      • Green Globes aligns at some level with more of the Federal requirements (25) than any other new construction system in the GSA review. The Green Globes system does not include two of the Federal requirements (benchmarking and building system controls).
      • LEED aligns at some level with 20 Federal requirements. The LEED system does not include seven of the Federal requirements (integrated design,process water, benchmarking, moisture control, acoustics, building system controls and greenhouse gas emissions).
      • The Living Building Challenge aligns at some level with 14 Federal requirements: The Living Building Challenge system does not include thirteen of the Federal requirements (integrated design, commissioning, water efficient products, measurement and verification, >benchmarking, recycled content, biobased content, thermal comfort, moisture control, indoor air quality protection during construction, acoustics, building system controls, and greenhouse gas)

      Existing Buildings
      • Green Globes CIEB aligns at some level with 22 Federal requirements. The Green Globes CIEB system does not include six of the Federal requirements (commissioning, recycled content, biobased content, low emitting materials, siting, and building system controls).
      • LEED EBO&M aligns at some level with more of the Federal requirements (27) than any other existing building system in the GSA review. The LEED EBO&M system does not include one of the Federal requirements (greenhouse gas emissions).
      • The Living Building Challenge aligns at some level with seventeen Federal requirements. The Living Building Challenge system does not include eleven of the Federal requirements (commissioning, water use, stormwater, water efficient products, measurement and verification, recycled content, biobased content, thermal comfort, integrated pest management, moisture control, acoustics and building system controls.)

      Other Comparisons
      • Green Globes and Living Building Challenge use on-site auditors to augment the certification information received electronically, while LEED bases its certification solely on the information submitted electronically.
      • LEED has an established piloting process that is implemented prior to a revision to the certification system being released.
      • LEED requires that new construction projects submit measured energy and water performance to the USGBC for five years following certification.
      • The Living Building Challenge is designed to incorporate the results of at least the first year of a building’s operations prior to certification, which means this system has the greatest emphasis on measured performance.

      The chemical and plastics industries object to LEED’s proposed fourth-generation standard, known as LEED v4, which originally allowed buildings to score points for avoiding certain chemicals of concern, such as polyvinyl chloride, or PVC. The chemical-plastics industry coalition complained that these are “arbitrary chemical restrictions” and claims that LEED is “becoming a tool to punish chemical companies.” But the draft has since been changed, to provide only credit for using "good" materials, not avoiding "bad" ones. Still, the chemical and plastics industries still seem to find this threatening. The industry group also claims that LEED v4 is not “science-based” and does not use a “true consensus approach” to development. Among the industries’ concerns is a proposed credit that applies to the construction of schools, stores, and data centers, among others. It is meant to encourage the use of materials that disclose chemical ingredients and encourage builders to use products that don’t exceed a certain level of lead, mercury, hexavalent chromium, carcinogens, polyvinyl chloride and other toxic substances.


    • Measurement Equity - Home Performance measures Energy per Square Foot. A measure of energy use per resident would be more equitable. An energy efficient 4000 sqft mini-mansion with no one home can have a better score than an unimproved 1500 home with a family of four even though the later uses much less energy per person.

    • Innovation - Codes and standards take a long time to adopt and modify they also tend to inhibit innovation and encourage the use of approved, but obsolete technology

    • Flipping – The builder’s goal is to sell the building immediately after construction at the highest profit margin. The way buildings are constructed and financed emphasizes lowest first cost. Contractors The builder’s goal is t sell the building immediately

    • Modeled vs. Actual Performance - The gap between designed (aka modeled) and actual building performance is one of the most important issues in green buildings and by extension the push to improve the energy efficiency of our economy.

    • LEED "Box Ticking" - When it comes to energy efficiency, it is often the letter of the law is often used more than the spirit of the law. In LEED projects a comprehensive energy efficiency strategy built into the overall design and construction of a building could be “dumbed down” into a series of tag on efforts.

      While some energy efficient measures might be taken, they aren’t necessarily ones that are strategically important in making a big dent in overall energy consumption. It becomes a box-ticking exercise more than a serious attempt to curtail energy use—changing the lightbulbs when you could transform the building. The sad truth is that many green buildings today are neither highly efficient nor particularly intelligent, and this is a missed opportunity. We have the potential to deliver green intelligent buildings that are sustainable as well as able to deliver high-performance, low-energy usage. A green intelligent building “not only has a bike rack, green roof and waterless urinals, but also the systems, controls and automation needed to provide improved scheduling, coordination, optimization and usability.

    • Commercial Focus - Programs like LEED are geared more for commercial construction versus residential.

    • Poor Quality Insulation - Title24 derates insulation performance by 30% (that is R30 is treated as R20) because in practice so many insulation installations are done wrong. The insulation installer is usually the lowest paid constration worker with the least training and often poor working conditions and is often working on a piece rate. Often, insulation building inspection is not required by building departments. QII, Quality Insulation Inspection, requires a third party HERS inspection.

    • Lack of Context - A project can earn a high rating and be located in a hard-to-reach place or built on former open space.
    • Compliance and Enforcement
      • Lack of Inspection/Staff Time
      • Interpretation Problems
      • Inconsistent Interpretation
      • Structural and Safety Codes are the priority
      • Capacity and Training

    6. Next Steps
    Source: IEPR Workshop California Energy Commission July 20, 2011
    Source: IEPR Workshop California Energy Commission July 20, 2011
    These next steps are based on some of the 134 gaps identified in Standardization Roadmap, Energy Efficiency in the Built Environment prepared by the Energy Efficiency Standardization Coordination Collaborative of the American National Standards Institute. Version 1.0, Draft was made available for Public Comment January 2014
    •  There is a need for standards that address supply chain and product embedded water–energy evaluations that can inform consumers of the energy and water intensity of the building systems, products, or services they buy. There is currently no recognized consistent methodology for the way building systems, products, and services are evaluated as to their overall water and energy footprint. Architects, engineers, consumers, and companies wishing to proactively reduce their water and energy intensity often receive mixed messages as a result. Developing uniform standards that address the water and energy embedded in a system’s or
      product’s supply chain would serve several purposes:
      1. Provide a needed consistent method that would allow proper cross-comparison of options for products and services;
      2. Smooth out the duplicative and competing footprint methodologies, some of which unfairly favor certain companies, processes, or products, and most of which do not correctly count both water and energy interactions back through the supply chain; and,
      3. Allow a deeper focus on systems, products, and services in the commercial and industrial sector where the combined water and
        energy savings potential is very high.
      Recommended Timeline: While work should begin as soon as possible, this is a complex issue and is therefore a long-term effort: 5+ years.

    • There is a need to address detailing and integration of the building envelope at interface conditions – quite literally the 'gaps' between materials, components, and systems in a building enclosure. Perhaps more than any other single aspect of design and construction, improper detailing and installation at these conditions is the most common source of improperly managed heat/air/moisture transfer and a corresponding increase in energy use, operation, and maintenance costs over the lifecycle of a building.    Work to address this gap should be conducted in the near-term: 0-2 years

    • Thermal energy is a grossly underutilized resource in the United States relative to other developed countries. The development of an American National Standard for heat metering, led by ASTM International with cooperation from IAPMO, is currently underway. This standard will address a major gap in standardization, allowing for thermal technologies to be more easily utilized in residential and commercial buildings.

    • Currently, there is considerable debate at codes and standards meetings in the industry regarding the minimum level of duct leakage testing that is required to improve efficiencies. Independently developed data pertaining to the practical levels of duct leakage testing is needed to guide standards developers to determine cost-effective provisions while avoiding unnecessary cost. ANSI recommended Timeline: This work should be conducted in the mid-term: 2-5 year

    • Consensus standards for heat metering and hot water solar thermal systems need to be completed to advance the use of thermal technologies for water heating applications. This represents a significant and very achievable advancement in energy efficiency.
      Recommended Timeline: This work should be conducted in the mid-term: 2-5 years.

    • There is considerable pressure to further increase the water savings by requiring decreased flows and flush volumes. It has been shown that further reduction in water use can be achieved through more efficient plumbing component design. Nevertheless, there is little research available today that evaluates the impact of those designs on the plumbing system’s overall performance due to reduced flows in the system, and especially the drainage system. There are research projects underway in the U.S., notably the Plumbing Efficiency Research Coalition, that will help to determine “how low we can go” without negatively impacting public health and safety.

    6. Links