Ground Source Closed Loop Heat Pump Unloading Curves

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Has anyone had any experiece with creating unloading curves for TRANE GSHP units.  I have calculation the compressor kW/ton, and kW/MBh values but do not know how to plot the curves at different loading capacities.  My initial review back from USGBC commented on providing a curve. 

The units I have are single compressor, according to the sales rep they are ON or OFF at 100%, I don't think this is accurate but could be wrong.

Is there a standard equation to create these curves?  I went through AHRI 330 but could not find any significant information on part load calculations for ground source heat pumps, they mention it, but just the testing method.


avibhogal's picture
Joined: 2012-03-06
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I haven't done it before.  But, have you reviewed the built in curves in the library for GSHPs?  They may be a good place to start.

ajuran's picture
Joined: 2011-05-12
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Yes always good to start with one of the default curves first, copy it, and tweak your new one to match your equipment.

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Bobba_Fett's picture
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Joined: 2010-10-01
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