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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

CHP - Approach

Hi, I have a project with a CHP and I am unsure how to model in line with requirements. It is to be constructed as part of the current project and will be in the LEED boundary. However ultimately it will be sold to the utility (who is technically owned by the county who owns the building but different entities so not really) who will sell the electricity back to the project building for a reduced rate and give the waste heat to the project for free (which is used for heating and in absorption chillers). My Question is, should I model as per the proposed operation? Free waste heat, reduced cost electricity even if it will eventually not be owned by the project building. With the baseline being as per 90.1 OR Should I model as if the CHP is on site and owned by building so traditional CHP/absorption chiller set up - Pay for gas input, get heat and electricity as generated by the CHP. Thanks Victoria

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

Mon, 10/31/2016 - 19:41

Sounds like if it is part of the current project and within the boundary it gets counted as on-site CHP. Does this plant serve other buildings? If so then all externally used electricity or waste heat is treated as a process. This fuel input is then modeled identically in both models.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 10/31/2016 - 19:51

There is additional guidance on these kinds of situations in the Reference Guide.

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