[EnergyPlus_Support] RE: ASHRAE 90.1 Opaque Door

[<rahula7@xxxxxxxxx>]

Doors are specified according to NFRC 100 (Appendix Section A7). You need to look at how opaque nonswinging doors are defined under NFRC 100. 

If you look at skylights with curbs, the U-factors are 1.98 (IP) in some climate zones. Such high U-factors are possible because the curb, which runs parallel to the roof opening of the skylight and perpendicular to the glazing area, also contributes to the heat loss. Something similar could be happening to the nonswinging doors.

Rahul

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <energyplus_support@xxxxxxxxxxxxxxx> wrote:

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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