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International Conference on Green Buildings and Optimization Design (GBOD 2012)

Xie Hao
Xie Hao
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Quantifying the effects of roofing materials on building temperatures and conditioning energy use is important for developing realistic claims of benefits of cool roofing technologies. Side-by-side homes in Fresno, California with similar floor and elevation plans have been provided for the study by Granville Homes, the main difference being that one of the homes has a standard dark asphalt shingle roof and the other has a solar-reflective concrete tile roof. The homes are instrumented to monitor roof, attic and room temperatures; heat flux through the ceiling, and electrical energy use. During the analyzed period (May to September 2011), measurements showed considerably higher roof and attic temperatures reached with the standard roof. Heat flux through the ceiling of the standard home was consistently greater than that through the cool home, producing an extra 7.5 kWh per day of heat energy being transmitted to the interior of the standard home.

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