[Equest-users] Modeling HVAC system with heat recovery

[Brian Fountain]

You have a couple of options regarding system type. There is a HP heat pump system type that is zonal meaning you would not need a system per zone.   However it has some keyword limitations including no ventilation heat recovery.   So to work around model heat recovery you will scale back the OA volume by the heat recovery effectiveness.   ( Not terrific. )

I recommend creating a system per zone and using the PVVT system type. PSZ would also work.  PVVT enables a few more keywords.   Both allow ventilation heat recovery to be directly modelled.

Whichever system you choose, set your heating to Heat Pump.   The keywords on the heating-supplementary tab will be enabled where you can add the OAT below which your electric resistance heating is enabled (default 40F) and the OAT below which the heat pump doesn't run. 


On Sep 4, 2023, 12:38 AM, at 12:38 AM, fraij via Equest-users <equest-users at lists.onebuilding.org> wrote:
>Hello,I have a model in eQUEST that has FCU as the HVAC system with
>heat pump chiller for a residential building. Now I need to change this
>HVAC system to DX heat pump and this heat pump is small and self
>contained in which it can be installed inside the room and will have
>inlet and out let ducts for the condenser air to the outside (I.e.
>without outdoor unit). This unit will have also heat recovery option
>and supplementary electric resistance heater.My question is, what is
>the best HVAC system in eQUEST that I can use for this heat pump and in
>the same time enable the heat recovery option tab and the supplementary
>heater option tab? And also, do I need to assign a new HVAC system for
>each zone or I can assign one HVAC system for a group of zones similar
>to the FCU system?Thank you very much for the help.RegardsAhmad
>
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