[Equest-users] Refrigeration version - mechanical subcooler

[Brian Fountain]

Phil,

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,

Brian

On 26/03/2020 11:43 a.m., Phil Jordan wrote:
>
> I remember this being tricky to add. Check out the “Hierarchy Rules” 
> (step 9) on page 9 of the DOE2 Refrigeration Dictionary:
>
> http://doe2.com/download/doe-22/DOE22Vol2r-DictionaryRefrigeration.pdf
>
> (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).
>
> Regards,
>
> *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
>        ATTACH-TO        = REFG-SYSTEM
>        REFG-SYSTEM      = "Refrigeration System"
>        CAPACITY         = {#PA("Subcool Cap TR")*3413}
>        DESIGN-SUBCOOL-T = 40
>        SST-SUBCOOL-TD   = {60}
>        SUPERHEAT-DT     = {101-90}
>        TEMP-CTRL        = SATURATION-DT
>        SATURATION-DT    = 40
>        SUCTION-CIRCUIT  = "Low Temp Suction Circuit"
>        ..
>     "Subcool liquid circuit" = REFG-CIRCUIT
>        TYPE             = LIQUID
>        ATTACH-TO        = SUBCOOLER
>        SUBCOOLER        = "Subcooler 1"
>        ..
>
>
> Has anyone successfully added mechanical subcooling to a refrigeration 
> version simulation?
>
> Many thanks,
>
> Brian
>
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