High R-Value Windows
Preliminary Technology Assessment
What is This Technology?
The Department of Energy (DOE) defines high-performance glazing as having a heat transfer coefficient (U-value) around 0.2 (R-5). By comparison, ENERGY STAR windows are R-3, while commercial double plane glazing is R-2. High-performance glazing also often includes spectrally selective coatings, which filter out from 40% to 70% of the heat normally transmitted through clear glass while allowing the full amount of light to be transmitted.
Why is GSA Interested?
Measurement & Verification
The Green Proving Ground program has commissioned the Lawrence Berkeley National Laboratory to perform measurement and verification (M&V) on high R-value windows at the Federal Center in Provo, Utah.
If you have questions or need additional information, contact the Green Proving Ground Program at GPG@gsa.gov.