Yes. ASHRAE 90.1 is known to ask for physical impossibility (eg. Fenestration U-values exceed 5.8 W/m2K). This is a known issue (also to the reviewers). Just use the max values in these cases.
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
Hi,
If I want to model an opaque door in a LEED project, does U-factors in relation to these doors include surface resistances when calculating them? If yes, some cases would not be possible. For example, climate zone 4 nonswinging door U-factor for semiheated category is 8.233, total resistance is therefore 1/8.233 = 0.1215, which is smaller than total surface resistance (0.12+0.03=0.15) (see Page 102, A9.4.1 section). It supposes the U-factor calculation does not include those surface resistances, is it right?Thanks.Sean
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