[Bldg-sim] Question regarding ASHRAE 90.1 Energy Cost Budget method - skylights

Claus Rudbeck (CLR) CLR at NIRAS.DK
Tue Jun 22 00:49:23 PDT 2010

Dear recipients,


Starting to read ASHRAE 90.1 with focus on skylights, I'm not sure that I read the standard correctly. Can anyone here help?


I'm reading ASHRAE 90.1 -2007 (SI Edition) and am looking for the building envelope requirements for Climatic Zone 5. As I read table 5.5.5 (assuming a nonresidential building), the skylight can have a U-value (of the assembly) up to 6.64 assuming it is made of glass However this doesn't give any meaning - since a U-value that high is almost equivalent to the surface resistance factors (and nothing from the glazing/gases etc.).


What U-value should I use for the skylights in the budget-building - assuming the building to be constructed in climatic zone 5?


Med venlig hilsen / Best regards

Claus Rudbeck
Civilingeniør, Ph.D., Indeklima og Energi

Sortemosevej 2, 3450 Allerød, DK
www.niras.dk <http://www.niras.dk/> 

Telephone +45 4810 4200, Fax +45 4810 4300
Direct +45 4810 4741, Mobile +45 2019 8786
clr at niras.dk <mailto:clr at niras.dk> 

P Consider the environment before you print!


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