The energy model input table for the LEED submission requires proposed construction assembly U-factor to be calculated in accordance with Appendix A, however spandrel is not mentioned in Appendix A. Do I just submit a U-factor based on the Aggregate R-value of the assembly with glass, air gap, and board insulation?
I use FramePlus Online to calculate both the glazing and spandrel performance. Go to FramePlus Online. Start FramePlus, this brings you to the glazing page, then select Switch to Spandrel Panel. When specifying the width of curtain wall, measure two panels wide as FramePlus includes one middle framing member. FramePlus doesn't have all the glazings you might want to model. Pick glass layers that are close.
It appears that the website has changed. http://tools.enermodal.com/frameplus/
Spandrel is opaque even though there is glass in the construction. The baseline for the spandrel area should be the same as any opaque wall assembly as required by your climate zone.
301_Hours, just add to your answer that yes, he should do an Rvalue calculation by adding the Rvalues of the glass, air gap, insulation etc
Asked: 2016-02-03 16:09:04 -0500
Seen: 1,836 times
Last updated: Apr 19 '16
