[Equest-users] Ground Water/chilled water loop error(s)

Dahlstrom, Aaron ADahlstrom at in-posse.com
Mon Oct 17 16:18:08 PDT 2011

Travis - sometimes this error can be addressed by putting a nominal process load on the offending loop - say 0.000001 Mbtu/hr, with a minimal schedule.

There may be a more comprehensive or elegant solution, but this might just get you going.


Aaron Dahlstrom , PE, LEED® AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Travis Miller
Sent: Monday, October 17, 2011 5:45 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Ground Water/chilled water loop error(s)

Hello all:

I have a system that is using well water direct to the cooling coils (no heat exchanger to protect the cooling coils) at multiple air handlers in the building. I set it up with the condenser water loop tied to a ground water heat exchanger. This condenser loop then is tied to another heat exchanger on the chilled water loop to the coils.  This approach has given me an error on the condenser water loop that it has no design flow. I have been playing with the primary/secondary loop designations, even putting some made up flow values into the loops/pumps etc. but have had no luck. Any ideas?

I would like to eliminate heat exchangers all together and just model the 50° well water directly into the chilled water loop - any advice on how to do this? I already changed the effectiveness of the heat exchanger to 1.0.


Travis Miller, PE
DC Engineering
123 W. Spruce St.
Missoula, MT 59802
P: (406)829-8828x209
F: (406)829-8829

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