[Equest-users] DHW Heat Pumps

[Yoni Pollak]

I don't think the program is that smart since I don't see a place where you
assign a space to the DHW heat pump.  I.E.  eQuest doesn't know which space
the dhw heater is located.  So unless I'm missing something, it looks like
the program does model it as a split system with the condenser outside.  

 

 

 

 

Yoni G. Pollak, PE

(T) 770-622-2270

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel
Wright
Sent: Thursday, August 02, 2012 10:54 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] DHW Heat Pumps

 

Hello all,

I'm trying to include a DHW heat pump into some of my models and am confused
about some of the results I'm seeing. It seems that the only option for DHW
heat pumps in eQuest is that the heater and its condenser are together on
the same unit (no split/external condenser). This seems fine, but I thought
that if this is the case, then the annual heating and cooling energy use
should be affected by the DHW heat pump. In particular it seems that in
winter the space heating energy use should go up since the DHW heat pump is
extracting heat from the space it's in, requiring the HVAC system to provide
more heat, and in summer the space cooling energy use should go down for the
same reason. But I see no change in the heating or cooling energy when we
run the DHW heat pump.

Can someone explain why this is the case? Am I missing something?

Dan

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