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,


bfountain's picture
Joined: 2011-09-30
Reputation: 201

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 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

Phil Jordan's picture
Joined: 2019-05-02
Reputation: 0


Thank you for your very helpful assistance in getting subcoolers working
in a refrigeration version model in eQUEST.? Your notes were
instrumental in resolving the problems I was having.? It turns out I
left my liquid lines attached to the refrigeration system -- essentially
the condenser -- rather than attaching them to the subcooler. This was
functionally bypassing the subcooler. Step 3 of your notes pointed out
the error.? I also had not fully defined the warmer loop before defining
the cooler loop as described in step 2 of the refrigeration hierarchy
guidance you shared.

I greatly appreciate your assistance.

Kind regards,


bfountain's picture
Joined: 2011-09-30
Reputation: 201