855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 165

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Methodologies For weighted average COP determination Projects may determine weighted average COP using a streamlined method, rated capacities, or energy simulation.

METHOD 1. STREAMLINED WEIGHTED AVERAGE COP DETERMINATION The streamlined method conservatively estimates compliance based on ASHRAE 90.1, Section 6.8 mandatory rated heating efficiencies of at least 2.0 COP for heat pumps and heat recovery chillers.

o To confirm a weighted average COP of at least 1.8, document that at least 80% of

equipment capacity consists of heat pumps, heat recovery chillers, or solar heating.

o To confirm a weighted average COP of at least 1.2, document that at least 20% of

equipment capacity consists of heat pumps, heat recovery chillers, or solar heating.

For Options 3 and 4, assess compliance based on total installed equipment capacity. For projects served by centralized base building equipment that is shared with other spaces, either calculate the weighted average COP separately for base building systems and for project-installed systems or prorate the base building equipment capacity to the project based on the percentage of design load serving the project or based on proportion of gross floor area.

For Options 1 and 2, assess compliance based on the total capacity serving the project.

METHOD 2. ENERGY SIMULATION Calculate the COP by dividing total annual heating generation by total annual heating energy consumption (using consistent units in numerator and denominator) per Equation 1.

Equation 1. COP calculation using energy simulation data

[𝑡] [𝑡][ 𝑎] [𝑎] [𝑎] [ ℎ𝑒] [𝑒] [𝑒] [ 𝑔] [𝑔] [𝑔] [𝑔] [𝑔] 𝐶 𝐶𝐶= [𝑡]

𝑡 𝑡 𝑡 𝑎 𝑎 𝑎 ℎ𝑒 𝑒 𝑒 𝑐 𝑐 𝑐 𝑐 𝑐

𝑡 𝑡 𝑡 𝑎 𝑎 𝑎 ℎ𝑒 𝑒 𝑒 𝑐 𝑐 𝑐 𝑐 𝑐 𝑐

Ensure that all applicable space heating and SWH energy used at the plant, system, and zone levels are included.

Projects may use any of the following to document the weighted average COP:

• Modeling used for EAp2: Minimum Energy Efficiency

o ASHRAE 90.1, Appendix G Performance Rating Method, proposed model

o ASHRAE 90.1, ECB method design energy cost model

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 154