[Equest-users] Heat Recovery question

[Paul Diglio]

I have the same question as Bill Lafley.

Once you enter the type of ERV, the eQuest defaults disappear.  The program then 
asks for the inputs.

Paul Diglio





________________________________
From: "Bishop, Bill" <wbishop at pathfinder-ea.com>
To: BLafley <BLafley at cetonline.org>; equest-users at lists.onebuilding.org
Sent: Fri, June 3, 2011 11:21:07 AM
Subject: Re: [Equest-users] Heat Recovery question


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,
 
 
-- 
Visit us online! <http://www.cetonline.org>
 
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)
www.cetonline.org<http://www.cetonline.org> | Sign up for EcoUpdates! 
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