[Bldg-sim] GSHP EIR Part Load Curve

[Anthony Hardman]

Also, several manufacturers have started using dual stage compressors giving
them part load ability.  

 

Anthony Hardman

Mechanical Engineer

Geo-Energy Services

 

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 7:46 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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