Hi Daric,

Based on eQUEST Dictionary, zonal exhaust goes throught the ERV. Only air exfiltration does not.
I believe you can model your lab exhaust directly at the zone level and still perform energy recovery on the exhaust fans.

[cid:image001.png at 01D36A80.CDBF70B0]

De : Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] De la part de Daric Adair via Equest-users
Envoy? : 30 novembre 2017 17:52
? : equest-users at lists.onebuilding.org
Objet : [Equest-users] Run-Around Energy Recovery

All;
Have a project using a run-around loop to recovery sensible energy from laboratory exhaust fans. I have reviewed the archives and my own memory, but this is leaving me scratching my head. I also recall a recent (maybe?) discussion on Zone vs System exhaust that may directly feed into this - but cannot find it.

If the lab hood exhaust is put in at the zone level, eQuest won't do energy recovery on this air-stream, as zone exhaust goes 'outside', yes?

My current thought is to configure the VAV AHU to have either 'Sensible HX' or 'Heat Pipe' and also have self-contained ERV fans. I'd input the Exhaust fans in as scheduled and then put a low/0 power fan for supply since there really isn't such. The OA is moved by the primary supply fan. I'd also calculate a 'HX power' or the run-around pump. I'd have 0 zone exhaust; exhaust only at the System level.

Can anyone comment on this approach or advise on how to best approach?

Thanks,
DARIC R ADAIR PE, CEM, BEMP
Mechanical Engineer, Energy Analyst

Henderson Engineers
8345 Lenexa Drive, Suite 300 | Lenexa, KS 66214
Tel (913) 742-5530
daric.adair at hendersonengineers.com

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