[Equest-users] Window Assembly U, SC Values

[Jason Wendel]

I got the review comment back from LEED that I needed to use the window assembly U-Value and SC Value, not the center of glass.  Unfortunately we have the problem, and it sounds like others do too on this forum, that the glass manufacturer gives values for the center of glass values, and then sells their glass to the frame guys to get the frames that the owner and architect want.  Neither one is willing to NFRC certify their product.  So, my options are to use the values in ASHRAE 90.1-2007 Table A8.2 which are horrible, or model the windows on LBNL Window5.
There are lots of windows and lots of different sizes of windows in the model, so my plan is to find the area (square feet) of each window, and then run Window5 on typical windows in 5 square foot increments (5, 10, 15, 20, etc. square foot windows) so that I can run 10 windows instead of 150, and then put it all in a spreadsheet and solve for the weighted averages.
If I put the weighted average of the window values into Equest, will they accept that?  Has anyone ever tried it?  I'm in the process of doing another LEED certification that will be using the same technique if it works, but I won't know if it was accepted in the first instance before I submit the second project.

Thanks,

-Jason

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