[Equest-users] eQuest GSHP inputs

Anthony Hardman Anthony at geoenergyservices.com
Wed Jun 18 10:25:18 PDT 2008



The only real constraints on your ground loop temperature are those imposed
by the HP mfgr.  For example, a Climate Master unit with the extended range
option can operate with source EWTs in the 20F-120F range.  Once you've
decided what you want to design your source side temperatures around, you
then have to iterate your other loop field design parameters until you find
a configuration that doesn't exceed your loop temperature limits.  Hope that


Anthony Hardman

Mechanical Engineer

Geo-Energy Services


From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Todd Lagus
Sent: Tuesday, June 17, 2008 11:01 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest GSHP inputs


Hello All,


I can't seem to get my space to cool using my GSHP even when I specify
sufficient cooling in terms of capacity and flow.  This is my first shot at
this type of system, so there are a lot of things that could possibly be
incorrect.  I imported coefficients from a ClimateMaster GSHP for operating
curves, but that still may be an issue.  What should the temperature inputs
be for the ground source heat exchanger loops, specifically the HW, CHW
design temperatures, and the minimum/maximum reset and alarm temperatures.
I'm trying to model a GSHP system with 45 degree ground source water in
heating and 55 degree ground source water in cooling.  I always end up with
a warning about going above the maximum alarm temperature, and the loop
shuts down.


Thanks in advance.


Todd Lagus, EIT

Mechanical Engineer

Sebesta Blomberg

2381 Rosegate

Roseville, MN 55113

Phone: 651-634-7236

Fax: 651-634-7400

 <http://www.sebesta.com> www.sebesta.com


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