[Equest-users] Problem with Modeling Heat Recovery

Fred Betz fbetz at aeieng.com
Wed Sep 24 06:22:26 PDT 2014


You need to reduce the effectiveness of your heat recovery system to account for less energy (air) in the exhaust stream so the heat transfer matches the design.

Unfortunately eQUEST does not allow you to separate general exhaust from local exhaust (kitchen hood, fume hood, etc.).

Hope that makes sense.


Fred Betz  PhD., LEED AP ®BD&C
Senior Sustainable
Systems Analyst

5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com<mailto:fbetz at aeieng.com>  |  www.aeieng.com<http://www.aeieng.com/>

From: behnam jowkar [mailto:behnamjowkar at gmail.com]
Sent: Tuesday, September 23, 2014 9:14 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Problem with Modeling Heat Recovery

Hi All,

I’m trying to model heat recovery on an AHU system, but I’m running into problems. The AHU supply is at 8000 cfm and return fan is at 4500 cfm. My problem is that I cannot get the heat recovery to work unless the supply and return flows are close to each other, but if I set the return flow close to the supply flow, my fan electrical consumption will increase. Does anyone know a way to get around this, or the only option I have is to set my supply and return flows to be the same? I appreciate any input from you guys.



Behnam Jowkar, MASc, BEng, LEED AP BD+C
Mechanical Engineer In Training
p: 416-716-5758
e: behnamjowkar at gmail.com<mailto:behnamjowkar at gmail.com>
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