[Equest-users] F-Factor to U-Value

Nick Caton ncaton at smithboucher.com
Thu Oct 14 09:24:44 PDT 2010


F-factors can't be entered directly, but are still pretty easy to handle in eQuest.

 

Open your copy of 90.1, and add a tab to Table A6.3, and read preceding section A6.

 

90.1 is explicit in what physically constitutes a floor slab with a given F-factor.  Typically, I need an unheated slab with F-0.73.  From this table and accompanying text I know that means simply to define a 6in. thick slab on grade with zero insulation while in the wizards.  eQuest does the rest.

 

I generally utilize the default library material properties (mass/conductivity) built into eQuest.  Those properties came under fire once from a nitpicky reviewer for being slightly different from Appendix A's final tables (see archives), but I learned after-the-fact that the material properties listed in 90.1 are derived from DOE2's libraries, so it was a moot issue.

 

~Nick

 

 

 

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Will Mak
Sent: Thursday, October 14, 2010 10:47 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] F-Factor to U-Value

 

eQuest requires an input of a U-Value when modeling a slab on grab layer. Typically, you enter a F-Factor to account for the loss per perimeter length. I did some research but could not find any solid conclusions on what is suppose to be done to convert the F-Factor to a U-value or configure eQuest to correctly model this. Any suggestions?

 

Thanks!

 

William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

600 West Fulton Street
Chicago, Illinois 60661-1259

D (312) 429-8116
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www.epsteinglobal.com <http://www.epsteinglobal.com/> 

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