Measured energy savings from the application of reflective roofsin 2 small non-residential buildings

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Energy use and environmental parameters were monitored in two small (14.9 m{sup 2}) non-residential buildings during the summer of 2000. The buildings were initially monitored for about 1 1/2 months to establish a base condition. The roofs of the buildings were then painted with a white coating and the monitoring was continued. The original solar reflectivities of the roofs were about 26%; after the application of roof coatings the reflectivities increased to about 72%. The monitored electricity savings were about 0.5kWh per day (33 Wh/m2 per day). The estimated annual savings are about 125kWh per year (8.4 kWh/m2); at a ... continued below

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Akbari, Hashem January 14, 2003.

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Energy use and environmental parameters were monitored in two small (14.9 m{sup 2}) non-residential buildings during the summer of 2000. The buildings were initially monitored for about 1 1/2 months to establish a base condition. The roofs of the buildings were then painted with a white coating and the monitoring was continued. The original solar reflectivities of the roofs were about 26%; after the application of roof coatings the reflectivities increased to about 72%. The monitored electricity savings were about 0.5kWh per day (33 Wh/m2 per day). The estimated annual savings are about 125kWh per year (8.4 kWh/m2); at a cost of $0.1/kWh, savings are about $0.86/m2 per year. Obviously, it costs significantly more than this amount to coat the roofs with reflective coating, particularly because of the remote locations of these buildings. However, since the prefabricated roofs are already painted green at the factory, painting them a white (reflective) color would bring no additional cost. Hence, a reflective roof saves energy at no incremental cost.

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  • Journal Name: Energy; Journal Volume: 28; Journal Issue: 9; Related Information: Journal Publication Date: July 2003

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  • Report No.: LBNL--47477
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/S0360-5442(03)00032-X | External Link
  • Office of Scientific & Technical Information Report Number: 917324
  • Archival Resource Key: ark:/67531/metadc881594

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  • January 14, 2003

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 8:56 p.m.

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Akbari, Hashem. Measured energy savings from the application of reflective roofsin 2 small non-residential buildings, article, January 14, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc881594/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.