[Equest-users] u-values

[Umesh Atre]

Tim,
 
Looks like you just happened to choose an inefficient door from the
library. You selected an uninsulated sgl lyr in your model.
Depending on your choice, the u-values will change. In the model below,
I have selected 3 different doors, for example.
 
With that said, and as the reviewer commented, I would advise not using
any defaults unless you do not happen to know the door constructions in
your design. 
 
 
 
 
 
 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of tim
Sent: Thursday, August 30, 2012 11:41 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] u-values



I let my eQuest model generate U-values (see LV-I report - page 2 of
attached pdf)

 

The U-values don't seem to make any sense.  The LV-I report says a door
has a U-value of 2.080.

I looked up hollow metal insulated doors on the internet and found one
that has a value of 0.16.

Why is there such a difference?

 

I know how to change u-values in detailed edit mode, but wonder what
experience others have had with determining what U-values should be
used.

I used an online calculator to find the u-value for a wall like mine
(also attached).

Having trouble figuring out how to determine/ enter u-value for a roof
assembly that is a trussed attic with insulation above ceiling as well
as others.

 

I also realize ASHRAE has basic u-values listed, but my leed reviewer
commented saying ASHRAE U-values should be used only if the actual
U-values are unknown.  I assume this means if the makeup of a wall or
assembly cannot be determined.

 

Thanks for your help in advance!

Timothy W. Hill

tim.JRGA at fuse.net

 

John R. Grier, Architect

11309 Deerfield Road

Cincinnati, Ohio 45242

(513)489-3690

 

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