As a thermal barrier, the building envelope plays a critical role in regulating interior temperatures and helps to determine the amount of energy required to establish a comfortable indoor environment. In commercial buildings, the space heating, cooling, and ventilation that maintain that environment account for 34 percent of energy used on site and 31 percent of primary energy use, according to the U.S. Department of Energy. By evaluating technologies such as “smart windows” and “high R-value windows,” which directly influence HVAC requirements, the GPG program is finding ways to make the building envelope more efficient.
Published building envelope findings
The GPG program, in association with federal laboratories, has subjected the following technologies to real-world measurement and verification in GSA buildings. Links to published results are listed below.
- Chromogenic Windows: Electrochromic and Thermochromic, March 2014
- Dual-Zone Indoor Shades, September 2018
- Electrochromic Windows for Office Space, November 2017*
- Electrochromic Windows for Land Ports of Entry, May 2015*
- Hi-R Low-E Window Retrofit System, December 2013*
- Low-E Window Film, February 2017*
- Solar Control Films, January 2015
- Vacuum Insulated Panels for Roofing Applications, March 2014
*M&V results demonstrate deployment potential for GSA