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NC-2009 EAp2:Minimum Energy Performance

On-site CHP Modeling

Profile picture for user info_37_2
MURAT DOĞRU
GREEN BUILDING EXPERT
ECOBUILD
LEEDuser Basic Member
1 thumbs up

Dear all, We are modeling a hospital building which is served by two 800kW CHP systems. The CHP systems are dedicated to this building only, i.e. Case 1 (same ownership, inside building) in the Reference Guide. The Reference Guide says that we should either simulate the system or do manual post-processing to calculate the hourly CHP performance. In our simulation tool (EnergyPlus), we cannot model the CHP directly. So, we have two questions regarding the two options recommended by the guide; 1. Since we cannot model the CHP directly, should we model the CHP following the calculation methodology in DES Guidance Appendix D? 2. Our second option is modeling the CHP in another tool (EnergyPro) and inserting the hourly performance results in the Exceptional Calculation Methodology section. Does this comply with ‘manual post-processing’? Thanks in advance.

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

Wed, 03/09/2016 - 20:32

Are you sure EnergyPlus can't model a CHP system? I would think that it could do so. 1. No, Appendix D of the DESv2 only applies to district CHP systems where the energy used and generated by the CHP needs to be proportioned to more than one building. This does not apply to a CHP solely dedicated to an individual project. 2. If you are going to do that and EnergyPlus can't model the CHP then I would just use EnergyPro and avoid the potential problems of trying to reconcile two different models. Technically you could probably do what you suggest but it seems like a lot of extra effort that is not necessary.
Profile picture for user info_37_2
MURAT DOĞRU
GREEN BUILDING EXPERT
ECOBUILD
LEEDuser Basic Member
1 thumbs up

Thu, 03/10/2016 - 08:05

Thank you Marcus. Indeed, EnergyPlus can model CHP systems but it can only model small scale residential cogeneration systems. That's why we cannot use this module directly. So, we will proceed with the second option and consider you advice. Thank you.

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