[Equest-users] Modeling GLHP systems

[Daniel Knapp]

FYI, eQUEST does not auto-size the ground loop. If you haven’t entered the number of boreholes, etc. then eQuest won’t create a ground loop of sufficient size. 

Best,
Dan

—
Daniel Knapp, PhD, P Phys, LEED® AP O+M
danielk at arborus.ca

Arborus Consulting
Energy Strategies for the Built Environment
www.arborus.ca
76 Chamberlain Avenue 
Ottawa, ON, K1S 1V9 
Phone: (613) 234-7178 ext. 113
Fax: (613) 234-0740




On Apr 7, 2014, at 2:29 PM, 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. I have attached my files in case someone has the time to take a look at them.
> 
> 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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