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[EnergyPlus_Support] Heat pump: external air – water loop

I have to model a heat pump that outside the building exchanges heat with the external air and it exchanges heat with the building, i.e. with the internal part of the HVAC plant, thorough water. The scheme of the plant is like as follows: www.taec.co.uk/Airpumps
The heat pump works both in heating mode (winter season) and in cooling mode (summer season).
In cooling mode I could model such a system as a chiller. But how could I model it in heating mode?
Could I find an example file in the folder ExampleFiles? I found examples, like 5ZoneWaterLoopHeatPump.idf, in which heat is transmitted through air loops but in my case there is no air loop.
Best Regards



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