[Equest-users] R-Value problem

[Eric O'Neill]

All,

 

I don’t think air films or steel studs are going to account for a U-value of 20, but it’s hard to say what’s causing the problem without more information. We would probably need screenshots at a minimum, but the project .pd2 and .inp files would be the most helpful. 

 

Eric

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Dakota Kelley
Sent: Friday, November 06, 2009 2:39 PM
To: Martin Ménard; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] R-Value problem

 

The conversion is accurate.  If your calculated values don’t agree, it’s usually due to one or both of two things:

 

1)      The conversion accounts for the inside air film (default of R-0.68), so you cannot simply take 1/R of the physical assembly to get the expected U-value

2)      If you are specifying steel framed construction in the wizard, the insulation will be de-rated according to the stud depth and spacing.  Refer to Table A9.2B in 90.1 for details.

 

Regards,

                                

                         DAKOTA KELLEY                                                              

                                Project Designer

 

                                Office:      214-744-6199

                                Cell:         214-280-3825

                                Fax:         214-744-0770 

                

http://www.teliospc.com <http://www.teliospc.com/>           3535 Travis St. Suite 115 

dakotak at teliospc.com <mailto:dakotak at teliospc.com>              Dallas, TX 75204 

 

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From: Martin Ménard [mailto:marmenard at gmail.com] 
Sent: Friday, November 06, 2009 1:36 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] R-Value problem

 

Hi all eQUEST user!
I'm a bit confused about my input values inside the Wizard mode VS Detail mode.
In "Building Envelope Constructions" window (3 of 25) I put an Overall R-Value of 20 h-ft2-°F/Btu...
But, when I go into the spreadsheet view (in Detail mode) and take a look at the Constructions details, I see a U Value of 20 Btu/h-ft2-°F!?
It's not realy the same thing!

Did you know why the software does not make the convertion R to U value correctly? Or is it my mistake? Should I put a U value when the software asks me to put an R value in the Wizard window?

Thanks to all and sorry for my poor English (it's not my first language) ! :-)

Martin

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