[Equest-users] Refrigeration version - mechanical subcooler

Phil Jordan phil.jordan at clearesult.com
Thu Mar 26 08:43:18 PDT 2020

I remember this being tricky to add. Check out the “Hierarchy Rules” (step 9) on page 9 of the DOE2 Refrigeration Dictionary:
(Looks like the doe2.com site is down so I’ve attached the relevant pages.)

Also attached are my notes on how I had simulated mechanical subcooling in prior models (in an earlier version of eQUEST – v3.61b, I think – but hopefully should still apply to the latest version).


Phil Jordan

From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Brian Fountain via Equest-users
Sent: Wednesday, March 25, 2020 6:00 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Refrigeration version - mechanical subcooler

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I have a model of a refrigerated warehouse in the refrigeration version of eQUEST.  It is running in version 7174 currently.

I am trying to add a mechanical subcooler to the model.  I can add the subcooler keywords, the PS-H for the subcooler is generated but so far despite many control keyword iterations, I am seeing no load on the subcooler and no impact on the refrigeration system with its inclusion in the model.

Currently, my inputs are:

"Subcooler 1" = SUBCOOLER
   TYPE             = MECHANICAL
   REFG-SYSTEM      = "Refrigeration System"
   CAPACITY         = {#PA("Subcool Cap TR")*3413}
   SST-SUBCOOL-TD   = {60}
   SUPERHEAT-DT     = {101-90}
   SATURATION-DT    = 40
   SUCTION-CIRCUIT  = "Low Temp Suction Circuit"
"Subcool liquid circuit" = REFG-CIRCUIT
   TYPE             = LIQUID
   SUBCOOLER        = "Subcooler 1"

Has anyone successfully added mechanical subcooling to a refrigeration version simulation?

Many thanks,

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