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NC-v4 EAp2:Minimum energy performance

getting hot water from CHP, but not the power. Can I still get the credit of the power produced?

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Moses Chong
Mechanical Engineer
WSP
LEEDuser Basic Member
2 thumbs up

Hi! My project is getting hot water from the central combined heat and power plant in the campus, but it's NOT getting the electricity from it. It's getting power from the public utility. Can I still get credit from the CHP? The LEED guide only describes projects that use the power from the CHP but I cannot find reference for my situation. The thermal efficiency is below 30% so it's killing all my saving.  

Thanks!

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Fri, 04/05/2024 - 15:48

Yes, if you are accounting for the fuel input of the CHP you should also be including the electricity generation. 
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Moses Chong
Mechanical Engineer
WSP
LEEDuser Basic Member
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Fri, 04/05/2024 - 18:50

Thanks for your reply! Do I simply add the energy to the baseline as process loads? I'm trying to understand the users' manual. It read to me I can add the excess electricity to the baseline as process load, and the gas that used to generate that electricity as process load. So in my situation, because I'm adding all of the gas as process load to the baseline, and all the electrcity generated from the CHP as process load to the baseline as well. Am I reading it correctly?

Mon, 04/08/2024 - 12:45

CHP electricity generation and fuel input are only accounted for in the Baseline in a situation where the Proposed building's allocation of CHP-generated electricity exceeds its modeled electricity consumption (Scenario B in the Reference Guide), which is typically not the case. Most projects have less CHP-generated electricty than their total electricity consumption (Scenario A), in which case no adjustments are made to the Baseline. 
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Moses Chong
Mechanical Engineer
WSP
LEEDuser Basic Member
2 thumbs up

Mon, 04/08/2024 - 17:32

But the project is not using the electricity from the CHP at all, so the CHP generated electricity exceeds the proposed building's allocation (which is zero). The CHP generated electricity is used only in other buildings of the campus. It's weird I know. 

Tue, 04/09/2024 - 12:19

I understand the project is not using electricity from the CHP. I am referring to are the CHP_ELECBLDG calculated according to the formula below from the reference guide (simple systems used for reference), which will either be less than (Scenario A) or greater than (Scenario B) the building's modeled electricity. CHP_ELECBLDG(simple systems) = (XHEAT x BLDGHEAT) x CHP_ELECTOTAL where CHP_ELECBLDG(simple systems) = CHP electricity generation allocated to building XHEAT = fraction of CHP plant's total production of waste heat applied to the DES directly BLDGHEAT = fraction of total district heat provided to building CHP_ELECTOTAL = total CHP electricity generated at DES plant  

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