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NC-v4 EAc2:Optimize energy performance

Baseline System for District Energy System (DES) Option 2

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Keith Lane
Project Engineer
GGD Consulting Engineers
LEEDuser Basic Member
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I'm working on a 73,000 s.f. clasroom building that has air-cooled chiller and boiler plants connected to a seperate building so need to follow the DES guidelines. I'm going the Option 2 but am unclear how to model the Baseline plant/systems. Under normal conditions, this building would have System 5 - Packaged VAV w/ Reheat Systems and System 3 - PSZ-AC units serving spaces with peak loads exceeding those served by System 5. Using DES Option 2, would I be requried to change both these Systems to be served by chilled/hot water plants or would they remain as typically required? The language seemed unclear so I'd really appreciate any guidance.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Wed, 09/21/2022 - 14:26

Option 2 is the prescriptive compliance path. Did you mean Option 1, Path 2? The DES guidance document under LEED v4 is contained in the Reference Guide.
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Keith Lane
Project Engineer
GGD Consulting Engineers
LEEDuser Basic Member
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Wed, 09/21/2022 - 14:37

My apologies, Yes Option 1 Path 2.

Tue, 10/04/2022 - 23:56

For Option 1, Path 2 the Baseline gets modeled as defined by Appendix G without any modifications. So in your case System 5 would be modeled with DX cooling and an on-site hot water fossil fuel boiler, and System 3 would be modeled with DX cooling and fossil fuel furnace.

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