[Equest-users] Heat Recovery question

[Bishop, Bill]

Bill,

 

I would just use the eQUEST defaults for whichever ERV-RECOVER-TYPE is
applicable. The variables I would focus on are the sensible, and if
appropriate, latent effectiveness, as well as the ERV-OA-FLOW and
ERV-EXH-FLOW. The effectiveness and/or efficiency are provided by the
HRV/ERV manufacturer. Note that "efficiency" and "effectiveness" mean
different things, and if you enter the efficiency in eQUEST instead of
sensible/latent effectiveness you will underestimate the energy savings.
See HVI (Home Ventilation Institute), Section 3, page two:

http://www.hvi.org/resourcelibrary/proddirectory.html

 

The manufacturer might have values for the air film resistance fraction
and exponent, but don't count on it. These values modify the
effectiveness based on hourly OA and exhaust airflows, so they won't
even matter unless the hourly airflows through the ERV/HRV change
significantly.

 

Regards,

Bill

 

 

 

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of BLafley
Sent: Thursday, June 02, 2011 4:59 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat Recovery question

 

Hello,

 

Can someone tell me where I get the following values and/or what are 

reasonable numbers for these inputs?  "HX Air Film Resist."  and "Air 

Film Resist Exp."

 

Thanks,

 

 

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Bill Lafley <mailto:blafley at cetonline.org> | Energy Analyst

Center for EcoTechnology | 320 Riverside Drive - 1A | Florence MA  01062

413-586-7350 ext. 222 | 413-695-2730 (cell)

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