Performance Criteria for Residential Zero Energy Windows

Publication Type

Conference Paper

Date Published

01/2007

LBNL Report Number

LBNL-59190

Abstract

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 which meet these needs are defined as a function of climate. In heating dominated climates, windows with U-factors of 0.10 Btu/hr-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 SHGCs (heating season) to low SHGCs (cooling season).

Conference Name

2007 ASHRAE Winter Meeting

Year of Publication

2006

Conference Location

Dallas, TX

Call Number

LBNL-59190