[Equest-users] U Factor Issue

[Chris Jones]

The U-factor reported in the .sim file includes 
the frame effects - if frames have been 
modelled.   If frames are modelled, each window may have a different U-factor
depending on the size of the window vs the amount 
of framing.  A smaller window will have a poorer U-factor.

The other issue is that the Simplified method 
asks for the Glass Conductance - not the U-factor.
 From the DOE22Vol2-Dictionary_47f.pdf manual:

GLASS-CONDUCTANCE
The conductance of the glazing, excluding the 
outside air film coefficient. The conductance 
given in glass manufacturers' data sheets usually 
includes the outside air film resistance for a 
wind speed of 7.5 mph (summer) or 15 mph 
(winter). Table 10 can be used to obtain the 
corresponding value of GLASS-CONDUCTANCE. For 
example, if U(7.5 mph) = 0.64 Btu/ft2-hr-F, then 
GLASS-CONDUCTANCE = 0.79 (by interpolation). For 
Uvalues of different glazing types, see 
manufacturers' data sheets or the ASHRAE 1989 Handbook of Fundamentals,
p. 27.16-17.

Emacs!



At 05:01 PM 03/09/2012, Andres Franco wrote:
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>Hi there, I´m working in a medium size project 
>of a warehouse, apparently all in eQuest  is 
>working fine but when I  saw the results for the 
>glass in all my windows the U-Factor values are 
>wrong, I want to know if somebody has already 
>had this problem or if exists any formula or 
>something for make an input accurately for the 
>glass factor values in a correct way, thanks in advance, best regards.
>
>
>
>
>
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 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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