Forum discussion
NC-2009 EAp2: Minimum Energy Performance
Dear all,
I'm working on modeling of existing library building. I don't have existing glazing details. Do I have to go for unlabeled vertical fenestration (table 8.2 of ASHRAE 90.1 2007) for baseline model or just go with table 5.5-4? They are replacing all the windows.
Thanks
Sunil Sindhe
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
November 30, 2018 - 9:59 am
You can use the prescriptive values. The values in A8.2 will be worse so using them will likely increase the baseline energy use. Using the lower values in Table 5.5-4 will produce less savings. So this approach would be considered conservative and therefore acceptable. Make sure you tell the reviewer the situation and that you are choosing to be conservative.