LEEDuser Premium membership gives you access to all credit tips, checklists, documentation samples, and more. For project percent improvement for the cost metric, on-site renewable energy may be subtracted from proposed energy cost prior to calculating proposed building performance per ASHRAE Standard 90.1-2013 Section G 2.4.1. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with: © 2020 BuildingGreen, Inc. All rights reserved except where noted. Defining the baseline for energy performance. Major Sample templates to help guide your narratives and LEED Online submissions. NC-Retail (except restaurant/grocery) 5% Alternatively, to claim more than 20% lighting power savings for a complete lighting system, the greater of the installed lighting power or the tenant required lighting power density may be modeled in the proposed case if a binding owner commitment letter with a sample tenant sales and lease agreement is provided establishing tenant lighting power requirements. Points Healthcare o The LEED v4 Minimum Energy Performance Calculator (http://www.usgbc.org/resources/minimum-energy-performance-calculator) (or a document with equivalent information) with Baseline inputs updated to refer to Seattle Energy Code. • ID+C: The energy model must be modeled using the Title-24 new construction requirements for HVAC, DHW, lighting and envelope. This LEED Interpretation pertains to the requirement to limit voltage drop for Energy & Atmosphere Prerequisite 2 for Minimum Energy Performance. As the Rating Authority for LEED projects, the GBCI will accept an ECM for garage demand control ventilation under the following circumstances: 2) Proposed case shall reflect the actual design. Calculators to help assess credit compliance. 90,000 square feet is conditioned by a variable air volume system with electric reheat, and 10,000 square feet is conditioned with fossil fuel furnaces This Executive • The Proposed model shall include either a 20% increase in the receptacle power density for these spaces OR a 20% increase in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Baseline model. Fundamental Commissioning of Buildings Energy Systems - Pre2. Title 24 2019 has requirements for lighting power density more stringent than those requirements in ASHRAE 90.1-2010, and unfinished spaces in our project will be subject to the Title 24 2019 requirements. Additionally, all projects using this method must provide a narrative explaining how infiltration and exfiltration of air through building entries is addressed in the design. A sensitivity analysis related to the number of occupants entering on an hourly basis would need to be justified. A sensitivity analysis related to the number of occupants entering on an hourly basis would need to be justified. If the documentation demonstrates that tenant space layout is complete, and that a lighting system has been designed and installed such that the tenants most likely to occupy the space can use the space for its intended function without alterations to the lighting system, shall this be considered a “complete lighting system”? (Note: Emergency back-up heating refers to heating that runs when the primary system fails or needs to be shut off in an emergency, and does not refer to a backup system which may be used to provide additional capacity as needed.). Unfinished spaces not submitted in the CS rating system shall use the CS values. EA P1 – Fundamental Commissioning of the Building Energy Systems (prerequisite) EA P2 – Minimum Energy Performance (prerequisite) EA P3 – Fundamental Refrigerant Management (prerequisite) EA 1 – Optimize Energy Performance; EA 2 – On-Site Renewable Energy… Our project is located in California and subject to compliance with Title 24 2019. • Path 1: LEED v4.1 projects Using the Appendix G Performance Rating Method may model a penalty in the energy model. o The Baseline model shall include either a 20% decrease in the receptacle power density for these spaces OR a 20% decrease in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Proposed model. The contaminants of concern that must be monitored may be limited to CO if a narrative is provided justifying how the controls will also help to limit NO2, VOCs and PM2.5 concentrations. Energy Type Utility Company Name Utility Rate and Description of rate structure1 Units of Energy Proposed Virtual Rate2 ($ per unit energy) Baseline Virtual CS-Restaurant / Grocery 2% The following pilot alternative compliance paths are available for this prerequisite. Note that this control setting is already corrected in CanQUEST for the Reference case. CS, Schools The following modeling requirements apply: See the pilot credit library for more information. EA Prerequisite 2 – Minimum Energy Performance REQUIRED Intent: To reduce the environmental and economic harms of excessive energy use by achieving a minimum level of energy efficiency for the building and its systems. Baseline system fan power shall be calculated at 0.3 watts per CFM. Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. ), or for biofuels not qualifying as on-site renewable fuel sources that are purchased, the actual energy costs associated with the purchased energy must be modeled in EA Prerequisite 2: Minimum Energy Performance and EA Credit 1: Optimize Energy Performance, and the renewable fuel source may not be modeled as "free", since it is a purchased energy source. LEED is changing all the time, and every project is unique. Internationally applicable. CS-Retail (except restaurant/grocery) 3% Project Type1 LEED® certification must meet a “Minimum Energy Performance” prerequisite. GSA projects are also subject to Executive Order. Energy and Atmosphere - Prerequisite 2 Minimum Energy Performance (Required points) Back to LEED Checklist To achieve any level of LEED certification buildings must demonstrate a 10% improvement for new buildings or a 5% improvement for existing building renovations in the proposed building performance rating compared to the baseline building performance rating per ASHRAE … Ground source heat pumps with backup fossil fuel boiler CS-Office 3% Note: The baseline and proposed receptacle energy consumption for these spaces must be modeled identically if using this approach; the project is not eligible for any further receptacle savings in these spaces using the Exceptional Calculation Method. The referenced energy standard and modeling requirements in LEED 2009 will not change. 3.9 Premium Economizer Performance Manual subtraction of the energy cost savings associated with vestibules as conservatively estimated by PNNL-20026 “Energy Saving Impact of ASHRAE 90.1 Vestibule Requirements: Modeling of Air Infiltration through Door Openings”. NC-Multifamily 3% The following additional requirements apply: Points BD+C (except Schools, Healthcare) CI-Office 3% Document the PCI, PCIt, and percentage improvement using metrics of cost or greenhouse gas (. Greenhouse gas emissions: The total greenhouse gas emissions, in terms of carbon dioxide equivalents, shall be calculated for the baseline building performance rating and for the proposed building performance rating, and the percentage improvement shall be determined using carbon dioxide equivalent emissions. Buildings falling under the proposed change can use the same methodologies and referenced standards, but will need to earn additional points in order to achieve certification. Not a member yet? 5) A narrative shall describe all Baseline and Proposed case assumptions included for this measure, and the calculation methodology used to determine the projected savings. New projects registering for LEED 2009 must now meet a higher threshold for minimum energy performance. This LEED Interpretation pertains to the requirement to limit voltage drop for Energy & Atmosphere Prerequisite 2 for Minimum Energy Performance. and energy consumption for equipment listed in Tables 1-4 of the LEED-NC for Retail EA Credit 1 credit requirements (documented in Upload EAp2-4). Comply with the HVAC and service water heating requirements, including equipment efficiency, economizers, ventilation, and ducts and dampers, in Chapter 4, Design Strategies and Recommendations by Climate Zone, for the appropriate ASHRAE 50% Advanced Energy Design Guide and climate zone: For projects outside the U.S., consult ASHRAE/ASHRAE/IESNA Standard 90.1–2010, Appendixes B and D, to determine the appropriate climate zone. Isolatek International’s Contributions to LEED v4 New Construction and Major Renovation. CI-Restaurant / Grocery 3% How can we document credit for Title 24 2019 compliant lighting in unfinished spaces? The project must provide documentation regarding the receptacle equipment controls that will be implemented for the project; and must provide justification supporting the claim that the savings over the life of the efficiency measure will be similar to those anticipated for a project compliant with Section 90.1-2010 Section 8.4.2. The proposed alternative compliance path for meeting the mandatory requirement of ASHRAE 90.1-2007/2010 Section 8.4, Voltage Drop Limitation, allowing voltage drop as a regulated parameter within the energy models, is not acceptable; however, a simplified alternative compliance path can be approved. o The Proposed receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known) Provide detailed exceptional calculation method calculations with each step of the calculation clearly described and in alignment with the analysis performed in PNNL-20026, but specific to the project building. ASHRAE 90.1-2010 mandatory requirement 8.4.2 Automatic Receptacle Control applies to 125 Volt receptacles in private offices, open offices, and computer classrooms. Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work. This approach would achieve the direct intent of the voltage drop requirement of Standard 90.1 in regulating the energy efficiency of power distribution systems, but through the inherent trade-off methodology of Appendix G would allow projects the flexibility to eliminate a disproportionate cost premium that is otherwise incurred by a prescriptive requirement. The Reference Guide includes guidance for calculating Update 11/9/20: Points are awarded according to Table 1 and Table 2. 3.5 Supply Air Temperature Reset (VAV) The energy model's scope accounts for only downstream equipment, plus purchased heating and cooling. Table 1. Calculators to help assess credit compliance. ASHRAE 90.1-2016 Compliance pathways in Section 4.2.1.1 include compliance with all mandatory provisions, and compliance with one of the following: On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. 1. • BD+C: Major renovations must be modeled using the Title-24 new construction modeling requirements for HVAC, DHW, and lighting (as opposed to existing conditions). The proposed design must meet the following criteria: Document the energy modeling input assumptions for unregulated loads. Certification for minimum energy performance requires that building electricity bills, cost, and usage be provided before improvements are made and that for a given building type and function, specific energy reduction goals must be met according to the guidelines for the EPA ENERGY … When using Appendix G, the Performance Cost Index (PCI) shall be less than or equal to the Performance Cost Index Target (PCIt) in accordance with the methodology provided in Section 4.2.1.1. ***Update 11/9/20: This ruling is now applicable to LEED v4.1 BD+C and ID+C projects. EXAMPLES OF BASELINE HEATING SOURCE DETERMINATION: Model baseline systems in accordance with NECB requirements for onsite generated equipment (i.e. For renewable fuels meeting the requirements of Addendum 100001081 (November 1, 2011) or other purchased renewable fuels, how should purchased on-site renewable energy be treated in the LEED energy model? Yes, in locations where the local code does not require vestibules or revolving doors the project team may choose one of the two options below. The following modeling requirements apply: Can the baseline model for refrigerated facilities be determined based on the IARW/IACSC Energy Modeling Guideline for Cold Storage and Refrigerated Warehouse Facilities as an exceptional calculation methodology under Appendix G? There are also three prerequisites for fundamental building system commissioning, minimum energy performance, and CFC More Energy & Atmosphere Credits. How should purchased bio-fuels (meaning it I not fossil fuel but is used in a similar manner to bio-fuel) be treated in the energy model? To pursue Option 1: Whole Building Simulation, is there a methodology for documenting additional energy performance for LEED v4 projects regulated by ASHRAE Standard 90.1-2013? Prerequisite 2 Minimum Energy Performance Intent: • Establish a minimum level of energy efficiency for the building. If building owners want to retrofit their projects to be LEED certified, the LEED Existing Buildings: Operations & Maintenance (LEED EB: O&M) rating system would be applicable in most cases. https://www.pnnl.gov/main/publications/external/technical_reports/PNNL-2... See all LEEDuser forum discussions about this credit », Unsubscribe from discussions about NC-v4.1 EAp2, Prescriptive provisions of Sections 5 through 10, Normative Appendix G Performance Rating Method. Our editors have written a detailed analysis of nearly every LEED credit, and LEEDuser premium members get full access. Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1-2010, with errata (or USGBC approved equivalent standard for projects outside the U.S.). CS-Hospitality 3% Model all enclosed building spaces within and associated with the building even if the space types are not regulated by Title-24. In the end, LEED is all about documentation. Yes, projects applying Option 1: Whole Building Simulation, and regulated by ASHRAE Standard 90.1-2013 may document additional energy performance improvement under LEED v4 EA credit Optimize Energy Performance as described below. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement many of these conditions correctly and would require corresponding modifications to the Reference case. The main focus of the changes and updates in LEED v4 was on building performance and environmental impact. Guidance documents on arcane LEED issues. Our project is in the process of determining the exterior lighting power allowance for an ASHRAE 90.1-2010 Appendix G energy model. Prerequisite. Prerequisite ENERGY AND ATMOSPHERE . Refrigerant type may not be used as an efficiency measure. Additionally, all projects using this method must provide a narrative explaining how infiltration and exfiltration of air through building entries is addressed in the design. Residential) Provide detailed exceptional calculation method calculations with each step of the calculation clearly described and in alignment with the analysis performed in PNNL-20026, but specific to the project building. **Update 1.11.2019: LI is applicable to LEED v4 projects. Note: Healthcare, Warehouse or Laboratory projects are ineligible for Option 3. 50,000 square feet is conditioned by water source heat pumps with a fossil fuel boiler, and 25,000 square feet is conditioned by electric heat pumps. Projects must meet the minimum percentage savings before taking credit for renewable energy systems. 3. Comply with Section 1: Design Process Strategies, Section 2: Core Performance Requirements, and the following three strategies from Section 3: Enhanced Performance Strategies, as applicable. Examples of actual submissions from certified LEED projects. CS-Multifamily 1% Prerequisite The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area. Baseline fan volume shall be based on the minimum required ASHRAE 62.1 parking ventilation rates of 0.75 cfm / square foot. Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.). building stock to reduce its energy use by 35. percent by 2010, compared with a 1985 baseline. Where ASHRAE 90.1 receptacle controls are not implemented in accordance with Section 8.4.2 mandatory requirements, LEED v4.1 projects may apply either Path 1 or Path 2, subject to the following requirements for Path 1: Guidance documents on arcane LEED issues. The baseline for this category are the minimum criteria for ENERGY STAR® qualified homes. • In addition to the documentation requirements established by the Seattle Energy Code, all required LEED documentation must be provided (and must include the same information as is required for ASHRAE 90.1-2010, with all baseline and proposed inputs shown) including: On-site renewable energy may be subtracted from proposed greenhouse gas emissions prior to calculating proposed building performance per ASHRAE Standard 90.1-2013 Section G 2.4.1. There is significant confusion, and seemingly contradictory LEED Interpretations on the required methodology for addressing “purchased” on-site renewable energy, and/or purchased biofuel that is not considered on-site renewable energy within the LEED energy model. Alternatively, use the COMNET Modeling Guidelines and Procedures to document measures that reduce unregulated loads. buildings can earn points for superior energy performance beyond the requirement of the prerequisite. LEARN MORE Intelligent PDUs Projects installing complete lighting systems in tenant spaces may not claim more than a 20% reduction in lighting power density for the purposes of prerequisite and credit achievement calculations. 15% CI-Hospitality 4% The narrative would also need to justify that the simulation software is capable of addressing the conditions required for the calculation. OR The following conditions (where applicable) must be met. • Path 1: LEED v4.1 projects Using the Appendix G Performance Rating Method may model a penalty in the energy model. In the end, LEED is all about documentation. The heating source for any building space would be considered “Fossil Fuel/Electric Hybrid” if the space is heated by any combination of fossil fuel and electricity. Add the following to the bottom of the International Tips section: Add the following as a USGBC-approved equivalent standard for projects outside the U.S. Our editors have written a detailed analysis of nearly every LEED credit, and LEEDuser premium members get full access. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies. ≥ where - (a) A is 0.3569 for a 2-pole motor, 0.0773 for a 4-pole motor and 0.1252 for a 6-pole motor; CS-All Other 1% Healthcare) No credit will be given for the use of air curtains when using this approach. 3% The current limit is posing a significant hardship to tall buildings relative to satisfying the mandatory requirements of ASHRAE Standard 90.1-2007 (also applicable in 90.1-2010), referenced in the prerequisite. The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit. • The receptacle schedule modeled in the Baseline for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than: The U.S. Green Building Council recently announced that all new projects registering for LEED 2009 beginning on April 8, 2016 will need to satisfy increased minimum energy performance thresholds. Desired points at minimum cost in the “Optimize Energy Performance” credit of leed certification August 2017 Journal of Civil Engineering and Management 23(6):796-805 Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6). The project team is requesting clarification regarding how to model spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. Are there any cases where exceptions to these mandatory requirements will be allowed? o The receptacle schedule modeled in the Proposed design for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than: the ASHRAE 90.1-2016 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year); or 120% of the occupied hours of operation for the facility; or detailed justification shall be provided supporting an alternate schedule. 1. UPDATED on 01/05/18 for rating system version applicability and in Section (2) to clarify that not all contaminants of concern must be continuously monitored. Minimum Energy Performance & Optimize Energy Performance Point(s): 1-18 (Final points earned depends on building owner’s ability to reduce temperature set points. Pre1. Projects using one of the following two compliance paths are exempt from the receptacle control requirements: 1. The Baseline heat source from Table G3.1.1A for the following Proposed Case system types would be fossil fuel since the proposed system design includes a combination of fossil and electric heat serving the same space for the majority of the building: New LEED v4 prerequisites for energy and water use. Our project is located in California. If space layout is incomplete, and a lighting system has been installed that provides adequate illumination for the open space in its current configuration, shall this be considered a “complete lighting system”? Several approaches could be implemented within the LEED rating system to address this disproportionate prescriptive requirement of Standard 90.1. It is recommended that a Credit Interpretation Request be submitted when pursuing this approach. Tracking spreadsheets for materials purchases.
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