This paper shows that the energy requirements for today’s typical efficient window products (i.e., Energy Star™ products) are significant when compared to the needs of zero-energy homes (ZEHs). Through the use of whole house energy modeling, typical efficient products are evaluated in five US climates and compared against the requirements for ZEHs. Products that meet these needs are defined as a function of climate. In heating-dominated climates, windows with U-factors of 0.10 Btu/h•ft2•°F (0.57 W/m2•K) will become energy neutral. In mixed heating/cooling climates, a low U-factor is not as significant as the ability to modulate from high solar heat gain coefficients (SHGCs) (heating season) to low SHGCs (cooling season).
Units: Dual
Citation: ASHRAE Transactions, Vol. 113, pt 1, Dallas 2007
Product Details
- Published:
- 2007
- Number of Pages:
- 10
- File Size:
- 1 file , 2.4 MB
- Product Code(s):
- D-DA-07-018
