[Equest-users] Central GSHP system pump energy

[jacob goodman]

I'm working on a system that uses an open loop ground well tied to a 
loop-to-loop heat pump (see screen shot below) with Lake/Well loop type 
and GSX type.  This heat pump serves hot and cold  water loops tied to 
fan coils. The "ground temp" is water being pulled out of a deep aquifer 
and set to 50 deg year round.

I have gotten the model to run without errors, but I am getting very 
high pump energy use from the ground loop. The head and pump sizing seem 
high but reasonable, but the flow seems way too high. I'm getting 540 
gpm peak and was expecting closer to 300 gpm.  This results in 18% of 
electricity use going to pumps, 17% going to heating and cooling combined.

Any suggestions?



Jacob Goodman , LEED AP, Green Building Specialist
v:509.280.7051  i:www.lseng.com <http://www.lseng.com>
L&S  Engineering Associates, Inc.
'High Performance Design'

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