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 Fellow7group / Energy Opportunities
LEEDuser Expert
5901 thumbs up
September 21, 2022 - 10:26 am
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.
Keith Lane
Project EngineerGGD Consulting Engineers
September 21, 2022 - 10:37 am
My apologies, Yes Option 1 Path 2.
Tyler Thumma
7GroupLEEDuser Expert
66 thumbs up
October 4, 2022 - 7:56 pm
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.