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NC-2009 EAp2:Minimum Energy Performance

District Energy System Guidance, Option 1

Hello, I am modeling a district cooling system, since the HVAC system serves three buildings, including the one that is seeking LEED Certification. If I select Option 1, I assume that the chilled water pumps must be considered as upstream equipment. However, the pumps are included in the energy model, the only upstream equipment is the chiller. My question is if I can assume that the pumps do not consume energy even if they are included in the energy model. Thanks in advance, Santiago

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
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Mon, 04/25/2016 - 15:03

I am a bit confused. How does the chilled water get to the other buildings if the pumps are not upstream? Why are they included in the model?

Mon, 04/25/2016 - 15:39

We are using Energy Plus simulation software, and as far as I know the only way to model district energy systems is to replace the chiller with a district cooling object, the rest of the chilled water system equipment, such as the pumps, are included in the energy model.

Tue, 04/26/2016 - 12:17

I think that the pump you model in EnergyPlus shall be the pump that is downstrem, i.e. after the heat exchanger between district system and building system. And you should model the heat exchanger and the pump in the same way in the design model and in the baseline model.

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