CI-v4 EAp2: Minimum Energy Performance Required

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. 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.

1. 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”. Refer to the Related Resource “Default Deduction for Vestibules” for the specific percentage subtraction required based on project type and climate zone.
2. 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. Document the additional energy consumption of the project building associated with removing the vestibules from the project. No credit will be given for the use of air curtains when using this approach. A sensitivity analysis related to the number of occupants entering on an hourly basis would need to be justified. The narrative would also need to justify that the simulation software is capable of addressing the conditions required for the calculation. (Software with a well-mixed air assumption would not be able to apply this modeling approach).

***Update 11/9/20: This ruling is now applicable to LEED v4.1 BD+C and ID+C projects.

As required in LEED Interpretation 10044, all equipment classified as eligible by ENERGY STAR must be included in the calculations. Equipment that is procured within two years of the effective date of the first (i.e. Version 1.0) ENERGY STAR product specification for that equipment category may be included or excluded at the discretion of the project team; however, all equipment within that category must be included or excluded consistently. Refer to the ENERGY STAR product specification(s) for the effective date.

Calculations may be completed using either the rated power OR the average annual power consumption, but the metric selected must be consistent for all equipment included in the calculations. For the purposes of demonstrating equivalency to the ENERGY STAR product specification by average annual power consumption, equipment purchased may use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator. The average annual power consumption for purchased equipment may be demonstrated by manufacturer documentation or calculated from actual equipment operating data and anticipated use profiles.

For Uninterruptible Power Supply (UPS) equipment:

If using the rated power methodology, the UPS “rated power” for the LEED Calculation may optionally be derated to 35% of the UPS Rated Output Power to more accurately reflect the relative energy usage associated with UPS equipment compared to other Energy Star equipment.

If using the average annual power consumption methodology, the UPS average annual power consumption (in units of kWh/year) shall be calculated as:
UPS Annual Power Consumption = 6,600 x Power x (1-Eff_AVGMIN)

Where:

Power is the UPS Rated Output Power in units of kW.

Eff_AVGMIN is determined consistently with the ENERGY STAR® Program Requirements, or 93.7% if unknown.

For projects located outside of the United States, the following approved standards may be used in place of ENERGY STAR for equipment categories covered by these standards: EU ENERGY STAR, TCO, Blue Angel. Additionally, equipment classified as eligible by ENERGY STAR but not ENERGY STAR-qualified may be deemed equivalent if the equipment has been labeled by a local energy label and has been rated by the labeling program to use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator.

Updated 3/1/2024 to clarify the LI is not applicable to the v4 2024 update.

Updated 01/05/18 for rating system version applicability and to provide additional calculation options for Uninterruptible Power Supply equipment.

The project team is requesting clarification regarding how to model spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. Projects using one of the following two compliance paths are exempt from the receptacle control requirements:

1. Path 1: Projects Using Option 1. Whole Building Energy Simulation may model a penalty in the Proposed model for the spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. The following modeling requirements apply:
• The 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).
• The receptacle schedule modeled in the Baseline for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than:
o The ASHRAE 90.1-2010 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year)
OR
o 120% of the occupied hours of operation for the facility
OR
o Detailed justification shall be provided supporting an alternate schedule.

• 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.

2. Path 2: Projects must demonstrate that the project has implemented efficiency measures that will achieve an equal or greater reduction in receptacle energy consumption, and will persist for a similar timeframe to those achieved by ASHRAE 90.1-2010 Section 8.4.2. It is recommended that a Credit Interpretation Request be submitted when pursuing this approach. 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. 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.

Update 3/1/2024:
This LEED Interpretation is not applicable to projects subject to the LEED v4 2024 update because the allowance is directly incorporated into the v4 2024 update Reference Guide content for EAp Minimum Energy Performance.

Update 4/21/2023:
Note, the additional requirements published on 11/9/2020 for v4.1 projects using Path 1 are incorporated into the v4 Reference Guide content for EAp Minimum Energy Performance.

Update 11/9/2020:
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:
• Path 1: LEED v4.1 projects Using the Appendix G Performance Rating Method may model a penalty in the energy model. The following modeling requirements apply:
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)
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.
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.

Project Type(NC = New Construction)
(CS = Core & Shell or unfinished space)
(CI = Interior Fitout)

Additional Percent Savings

Title 24 2016 /
Title 24 2019

Title 24 2022 (or later)

Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2016 (v4.1)

TDV Energy (replacing cost & GHG metrics)
TDV Energy (replacing cost metric)
SOURCE Energy (replacing GHG metric)
TDV Energy (replacing cost metric)

SOURCE Energy (replacing GHG metric)

Building Design & Construction (BD+C):

NC - Office
7%
18%
20%
4%
6%

NC - Retail (except restaurant/grocery)
8%
25%
29%
10%
14%

NC - Restaurant / Grocery
0%
18%
20%
4%
6%

NC – School
7%
20%
25%
5%
10%

NC – Healthcare
0%
8%
8%
2%
2%

NC – Hospitality
8%
15%
20%
0%
5%

NC – Warehouse
0%
28%
28%
10%
10%

NC – Multifamily (4+ stories)
8%
16%
20%
4%
8%

Multifamily low-rise (<4 stories)1
8%
16%
20%
4%
8%

Single family residential1
8%
16%
20%
4%
8%

Data Center
0%
10%
10%
0%
0%

All Other (< 50% unregulated TDV)
0%
15%
15%
5%
5%

All Other (≥50% unregulated TDV)
0%
8%
8%
0%
0%

CS-Office
5%
12%
16%
1%
4%

CS-Retail (except restaurant/grocery)
7%
20%
25%
5%
10%

CS-Restaurant/grocery
0%
13%
15%
2%
3%

CS-School
7%
15%
20%
2%
8%

CS-Healthcare
0%
8%
8%
2%
2%

CS-Hospitality
7%
11%
15%
0%
4%

CS-Warehouse
0%
21%
21%
6%
6%

CS-Multifamily
7%
9%
13%
1%
4%

CS-All Other
0%
8%
8%
0%
0%

Interior Design & Construction (ID+C):

CI-Office
6%
Use v4.1
Use v4.1
0%
0%

CI-Retail (except restaurant/grocery)
7%
Use v4.1
Use v4.1
6%
6%

CI-Restaurant/grocery
0%
Use v4.1
Use v4.1
0%
0%

CI-School
7%
Use v4.1
Use v4.1
3%
3%

CI-Healthcare
0%
Use v4.1
Use v4.1
0%
0%

CI-Hospitality
7%
Use v4.1
Use v4.1
0%
0%

CI-Warehouse
0%
Use v4.1
Use v4.1
9%
9%

CI-Multifamily
7%
Use v4.1
Use v4.1
0%
0%

CI-All Other
0%
Use v4.1
Use v4.1
0%
0%

**Update 1.11.2019: LI is applicable to LEED v4 projects.

Clarification is requested regarding when a building heat source in Table G3.1.1A should be identified as "Fossil/Electric Hybrid" versus "Electric".

The ASHRAE 90.1-2007 User's Manual states that a fossil/electric hybrid source "refers to a system with any combination of fossil and electric heat, and the baseline system for this is a fossil fuel system". Therefore, the predominant heating type for the building shall be determined based on the percentage of building area served by Electric-only heating versus “Fossil Fuel” and/or “Fossil/Electric Hybrid” heating. 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. This includes backup heating, heating of ventilation air serving the space, or preheating, But does not include emergency backup heat sources. The predominant heating type for the building shall be determined based on the percentage of building area served by Electric-only heating versus “Fossil Fuel” and/or “Fossil/Electric Hybrid” heating. (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.)

Exception: ASHRAE 90.1 Section G3.1.1 Exception (a) stipulates additional system type(s) for non-predominant conditions (i.e. residential/non-residential or heating source) if those conditions apply to more than 20,000 square feet of conditioned floor area.

EXAMPLES OF BASELINE HEATING SOURCE DETERMINATION:
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:
1. Variable air volume system with gas furnace preheat and electric reheat
2. Packaged terminal heat pumps with outside air tempered by fossil fuel furnace
3. Water source heat pumps with fossil fuel boiler
4. Ground source heat pumps with backup fossil fuel boiler
5. Residential condominium units with packaged terminal heat pumps, that have any amount of ventilation air provided to the space from air handling unit(s) where the supply air is tempered with fossil fuel.

The following buildings would be modeled with an electric heat source for the Baseline Case since the heating source serving the majority of spaces is electric-only:
1. 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
2. 50,000 square feet is conditioned by electric heat pump systems. 15,000 square feet is conditioned with fossil fuel radiant heaters.

The following buildings would be modeled with an additional system type with a different Baseline heating source in accordance with Section G3.1.1 Exception (a):
1. 90,000 square feet is conditioned by a variable air volume system with electric reheat, and 20,000 square feet is conditioned with Packaged DX systems with fossil fuel furnaces. In this case, the 90,000 square feet of area would be modeled with an electric heat source in the Baseline Case (System Type #6 - Packaged VAV with Electric PFP Boxes), and the 20,000 square feet of area would be modeled with a fossil fuel heat source in the Baseline Case (System Type #3 - Packaged Single Zone AC with fossil fuel furnace).
2. 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. In this case, the 50,000 square feet of area would be modeled with a fossil fuel heat source in the Baseline Case (System Type #5 - Packaged VAV with hot water reheat), and the 25,000 square feet of area would be modeled with an electric heat source in the Baseline Case (System Type #4 - Packaged Single Zone Heat Pump).