[Hap-users] Wall Assembly - Steel Stud Framing

Michael Hardy mhardy at blackoakengineering.com
Fri Jan 25 09:50:16 PST 2013

The Wall Properties Input Screen calculates the overall R and U values for a
sandwich assembly however it doesn't have any way to factor in the "framing
effect" of wall studs which can have a significant effect  on average wall
assembly R and U values.


When I queried Carrier, part of Craig's reply was for cooling design loads
and energy modeling, ".U-value is not important, what is important is making
sure the specific heat, density and weight of the composite insulation/stud
layer is correct. Those values are used in the TFM equations not U-value." 


Since this isn't as simple as inputting an overall U-Value from ASHRAE, Has
anyone come up with a way to effectively model steel stud framing that would
pass a DOE review?




Thank you,


Michael L. Hardy, PE, F.NSPE 
Black Oak Engineering, Inc.
Cell 503.314.5244 


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