[Equest-users] Heat recovery ventilation

[Bishop, Bill via Equest-users]

Peter,
The model looks sound and I don't see any "oops" inputs so quick QC looks okay.
Several things are going on that can minimize the benefit of heat recovery:

-        Oregon weather file with peak heating load at 34F

-        Modest ventilation requirement with roughly 20% OA

-        Low ventilation hours (2600 hrs/year)

-        High (?) infiltration rate (0.7 ACH) representing 1/3 of your heating load for system sizing

-        Efficient boiler

-        BOILER: MIN-RATIO = 0; START-UP-TIME = 0; STANDBY-TIME = 0 which totally eliminates cycling and standby losses

Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Reppe, CPHC, LEED AP via Equest-users
Sent: Friday, June 10, 2016 4:47 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat recovery ventilation

Hi folks,
In double-checking the savings numbers from ventilation air heat recovery on my straight-forward VAV system, I noticed that the heating savings are less than half what I'd expect (based on back-of-the-envelope QC).   I'm now out of ideas where to look for input errors, and am rather frustrated to see this happen on a pretty standard VAV system...

Would someone here have a moment and take a look, please (when running it, please use parametric run 4)?  I'd appreciate any feedback.

Thanks much!!!

Peter Reppe, LEED AP, CPHC
Energy Analyst

[cid:image003.jpg at 01CE44D4.DD6A74A0]Systems West Engineers
p. 541.342.7210
Our website has been renovated! See what's new at www.systemswestengineers.com<http://www.systemswestengineers.com/>

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