[Equest-users] [Bldg-sim] GSHP EIR Part Load Curve

[Demba Ndiaye]

The simulation time step in DOE2 is 1 hour and heat pumps won't run all
the hour if you are in part load conditions; so they don't operate at
100 %.

As during the hour, they cycle many times, there are losses and you need
the curve HEAT-EIR-FPLR for that.

______________

Demba Ndiaye

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Tony Kriel
Sent: Tuesday, May 20, 2008 9:46 AM
To: bldg-sim at lists.onebuilding.org; equest-users at lists.onebuilding.org
Subject: [Bldg-sim] GSHP EIR Part Load Curve

 

SIM List,

 

We are modeling a GSHP system in eQuest.  After selecting the options in
the wizard and running the model we noticed that the space heating was
quite a bit lower when compared to a VAV system for the same project.  

 

We then went into detailed mode and started to look into what
performance curves the heat pumps had defaulted.  It seemed that the
default part load curve (HEAT-EIR-FPLR) that eQuest selected, seemed
very aggressive.  It is my understanding that the heat pumps cycle on
and off when needed, and when they cycle on and off they operate at
100%.  So, should the part load curve be changed to be 100%, (ie it
shouldn't have a part load curve)?  Or should we be looking at something
else.

 

Thanks,

 

Tony Kriel

Mechanical Engineer

Sustainable Engineering Group, LLC.

431 Charmany Drive, Suite 102

Madison, WI 53719

 

Phone:  (608) 231-9664 ext. 16

Fax:  (608) 231-9665

E-mail:  tkriel at sustaineng.com

Web:  www.sustaineng.com 

 

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