Heat Exchanger Heat Pump

asked 2016-09-15 09:37:16 -0500

updated 2017-05-05 10:17:30 -0500

Hello All,

I have a heat exchanger that I am not quite sure how to model in EnergyPlus. I have inserted an image below: image description

(the blue arrows represent water movement and the black arrows air movement)

Basically I have two heating coils heating up the outdoor air as it comes in, and two cooling coils cooling the exhaust air as it leaves. This is a dedicated outdoor air system so there is no air mixing. The part that I am not sure about is the heat pump and water side of this model. In order for it to work correctly I need to move the hot water and cold water around the same loop, not only that but I also need to put a heat pump in to cool and heat it slightly as it passes through.

Does anyone have any thoughts on a good way to model this water loop? Also can I model heating and cooling coils in series rather than in parallel on the water side? can you put a water side heat exchanger between a hot water loop and cold water loop?

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My first thought is four plant loops. Two have water-to-water heat pumps for heating and cooling respectively and two have plant component temperature sources for condenser water for the heating and cooling loops. You can use EMS to poll the condenser water leaving the heat pump on one loop and set that to the plant component temperature source output on the other condenser water loop. I don't think you can run coils in series on the demand side of a water loop.

Adam Hilton gravatar imageAdam Hilton ( 2016-09-15 10:10:24 -0500 )edit

This is really pushing the envelop. The air-source HPs do not readily allow the condenser to be in an air stream since the condenser air inlet/outlet node is not an input to the model. The model typically expects OA to enter the condenser and condenser outlet air is exhausted to ambient.

rraustad gravatar imagerraustad ( 2016-09-30 20:19:13 -0500 )edit