[BLDG-SIM] Modeling Centralized GSHP in Equest

[Peter Alspach]

I have done a similar system once before but only at the schematic
design level. I ended up having to use the lake/well option and estimate
the source temp. I ended up using monthly source temps that I scheduled
based on estimates from a borefield designer/contractor who did some
separate modeling of the borefield. It took some iterations as I had to
run the model on typicall; chiller/boiler systems first to get loads
that he could then put into his borefield model. In the end it was
probably accurate enough for the purposes of SD- level system
comparisons.
 
These models in equest baffle me as to why they have such restrictions
built-into them - perhaps the software developers can shed light on
their reasons for these restrictions, but it certainly is frustrating,
as you have found out...
 
Peter

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of nicole
chen
Sent: Thursday, April 19, 2007 1:51 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Modeling Centralized GSHP in Equest


 
 

Hi Folks,


I am attempting to simulate a centralized GSHP using Equest. The plant
side is supposed to be coupled with vertical wells using ground loop HX.
The cooling plant equipment is supposed to be large heat pumps or
centrifugal chillers that reverse operation of evaporator and condenser
when switching from cooling to heating. The airside is fan coil rather
than room-level distributed heat pumps. 

  

 

#1: According to doe-2.2 dictionary only lake/well loop is allowed to be
attached to large water -cooled HPs and chiller condensers. And WLHP is
not allowed so. Is there any method to model such a GSHP system in
Equest? 

 

#2: or can lake/well be used to mimic ground source loops? Any
experience or advice of using this alternative is highly appreciated. 

 

Tons of thanks

 


-- 
Yours
Nicole Chen 
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