[Equest-users] Heat Recovery Chiller

[Fred Betz]

We stopped using the eQUEST heat recovery chiller years ago because it’s not controlled properly. eQUEST exclusively dispatches the heat recovery chiller on cooling demand, and in a hospital the heating or the cooling load may drive the heat recovery chiller. I never checked if v3.65 corrected this.

We use TRNSYS 17 with hourly loads from eQUEST et al as it allows us to be more accurate/flexible on controls, and then submit an exceptional calculation for LEED/compliance.


You can create your own spreadsheet do as it’s a pretty simple heat balance if the chilled and hot water temperatures are constant.

Note, that the capacity and the efficiency of the heat recovery chiller changes with the chilled and hot water temperatures so if you’re resetting temperatures it will make the spreadsheet more complex.


Hope that makes sense.

Fred


Fred Betz  PhD., LEED AP ®BD+C
Senior Sustainable
Design Consultant



AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
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From: Bikesh Dahal [mailto:BDahal at EMEGroup.com]
Sent: Tuesday, February 09, 2016 9:40 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat Recovery Chiller

Hi Everyone,
I am working on a project where I have a heat recovery chiller that is recovering heat from IT room units in a hospital and then providing heat to VAV reheat systems for other spaces. I am trying to model this in  equest and not getting the desired result.

eQuest is not letting me connect to reheat loop. And when I connect it to my steam loop, I see no heating savings whereas I see increased cooling use.
Anyone has any ideas on how to model this properly?

Bikesh Dahal, BEMP
Associate

[cid:image003.png at 01D06C70.35E5BD50]
159 West 25th Street
New York, NY  10001
tel:  212-529-5969, ext. 318
fax: 212-529-6023
bdahal at emegroup.com<mailto:bdahal at emegroup.com>
www.emegroup.com<http://www.emegroup.com>
NY ▪ Albany ▪ Philadelphia ▪ Denver

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