How should one model existing glazing U-Values and Solar Heat Gain values when they are unknown (they were installed 24 years ago). I am referring to the Baseline Model ASHRAE Table G3.1 5f
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
September 8, 2016 - 10:48 am
There are a few ways. Try to find the performance data on the old windows. The data can be determined through measurement. Use Table A8.2 from ASHRAE 90.1-2007.