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NC-v4 EAp2:Minimum energy performance

DES Proposed Case Default Efficiencies

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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
79 thumbs up

Dear All,

 

According to the section “Further Explanation” of the LEED Web guide, projects that are served by district energy systems (DES) and follow Option 1 (Whole Building Simulation) Path 1 (ASHRAE 90.1-10 Appendix G ) may demonstrate compliance with EA Prerequisite Minimum Energy Performance and EA Credit Optimize Energy Performance by modeling the proposed case with a virtual DES-equivalent plant. When information regarding existing DES efficiency is not available, default values may be assumed, namely:

  1. DES heating plant: 70% (higher heating value, HHV) for the total boiler plant average efficiency
  2. DES cooling plant: coefficient of performance (COP) of 4.4 for the total cooling plant average efficiency (including cooling towers and primary pumps)
    • Thermal distribution losses including minor leaks or condensate losses:
    • Chilled water district cooling, 5%
    • Hot water district heating, 10%
    • Closed-loop steam systems, 15%
    • Open-loop steam systems, 25%

 

Do you validate our interpretation?

 

Thanks in advance,

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 07/10/2020 - 16:57

THe DES guidance is in the Reference Guide for v4 projects, so assuming you got the information above from there it appears to be an allowable method.

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