[Equest-users] Modeling ground loop heat pumps

[Heinm04]

Behnam,

Loop field design has a lot of parameters. I suggest beginning with an autosize in eQuest based on the fairly standard design parameters of 200' deep, 15' oc spacing, ~15% glycol, ...

Adjust the quantity of boreholes until you meet the load. 

There is much more detail that can be shared but if you're not familiar with GSHP in eQuest it will get you started. 

- Matt H
Sent from mobile, please excuse typos. 

> On Apr 7, 2014, at 10:51 AM, behnam jowkar <behnamjowkar at gmail.com> wrote:
> 
> Dear All:
> 
> I am trying to model a ground loop heat pump system in equest, but I keep getting the following errors: " WLHP loop: Ground Loop has exceeded a hi/low alarm limit and will shut down associated HVAC equipment for the hour. Loop T:  17.91  Limit:  20.00. Verify that alarm limits are reasonable, verify primary equipment sizing, especially ground-loop heat-exchangers, and verify that the HP performance curves are suitable for the intended operating range." as well as "Ground-loop HX: Ground Loop Heat Exchanger 1 is undersized for the load and is producing an extreme temperature of -4F."
> 
> Since the design is a closed loop system (vertical pipes) I have created a GLHE of type 'Vertical Well-Sweden G-function', connected to a circulation loop of the type 'water loop heat pump'. I have also inserted the GSHP curves from DOE 22. I'm not sure if the problem is the parameters I have defined in the model, or from the way I have set things up in EQUEST. I would really appreciate it if someone with more experience than me can help me out with my problem.
> 
> Best Regards,
> 
> Behnam
> 
> -- 
> Behnam Jowkar, MASc, BEng, LEED GA
> Mechanical Engineer In Training
> p: 416-716-5758
> e: behnamjowkar at gmail.com
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