[Equest-users] VRF with heat recovery

Brian Fountain bfountain at greensim.com
Thu Nov 15 07:41:43 PST 2012

In the current version of eQUEST, you are limited to modelling VRF with a
series of PVVT systems.  There is no way for heat from one PVVT system
operating in cooling mode to be rejected to another PVVT system which
requires heating.  You could model the VRF system as water source heat pumps
which would allow the recovery of heat to other zones - but does not allow
for the variable flow compressors and the cooling becomes water-source
rather than air-source.


From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Evangelia
Sent: Thursday, November 15, 2012 8:35 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] VRF with heat recovery


Dear users,

I am modelling a VRF system  (gas heat pump, heat recovery etc), I have
already read the suggested presentation from Energy Trust of Oregon
regarding VRF system modelling. At the end of the presentation is described
a procedure in order to calculate the heat recovery (Create an hourly report
for each zone with two series Elec input to heat (kW) and Elec input to cool
(kW), when there is both heating and cooling for a particular hour the
smaller value of the two is the energy recovered by the Refrigerant Branch
Selector Box). Is this the only way to calculate the recovered energy, does
not the software take it into account during the simulations? Must this
amount be subtracted from the total energy consumption?

Thank you for your help.




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