The project has been completed. The findings from this project indicate that cool walls can reduce whole-building annual HVAC use by up to 25% in single-family, 3.7% in medium offices, and 9% in stand-alone retail stores. The final report will be published in January 2019.
This project (a) quantifies the energy savings, peak demand reduction, urban cooling, and air quality improvements attainable from cool walls in California; (b) assesses the performance of existing cool wall technologies, develops innovative cool wall solutions, and (c) facilitates collaboration among government agencies, utilities, and industry to create a cool-wall infrastructure that includes application guidelines, a product rating program, incentives, and building code credits.
Solar-reflective cool walls reduce absorption of sunlight by the building envelope, which may decrease cooling load in warm weather and increase heating load in cool weather. Impacts of cool walls on a annual HVAC energy use depend on climate, wall construction, wall orientation and other factors. Decreasing cooling load will directly reduce customer bills for air conditioning. It could also reduce electricity generation capacity procurement costs when incorporated into the Load Forecast. Project results show that cool walls can reduce whole-building annual HVAC energy use 3.0% to 25% in single-family homes, 0.5% to 3.7% in medium offices, and 0.0% to 9.0% in stand-alone retail store.
By reducing space conditioning load, annual fossil power plant emissions could be reduced, with consequent reductions in greenhouse gas emissions as well as nitrogen oxides and sulfur dioxide.
Key Project Members
University of Southern California
The Regents of the University of California, San Diego
Metal Construction Association