A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Changes in Building Heating and Cooling Requirements Due to a Reduction in the Roof's Solar Absorptance
Sunlit surfaces of buildings experience higher temperatures during hours of solar exposure than those experienced by unexposed surfaces. The solar radiation incident on building exterior surfaces may in turn affect the heating and cooling loads imposed on the building's HVAC system. An increase in surface temperature due to insolation increases heat gain during the summer and reduces heating loss during the winter. Since this is a counteracting influence with regard to energy usage, questions arise as to how annual HVAC energy requirements are changed when a surface's radiative properties are altered. The reported study focused specifically on changes in heating and cooling loads when the roof's solar absorptance was reduced from 0.8 to 0.3. Calculations were made using DOE-2.1B for two different buildings at twenty different cities. A third building type was examined for five of the locations. The paper presents the calculated load changes in the form of bar graphs. The magnitude of the load changes are shown to be significantly influenced by the convective coefficient. For locations of high solar intensity and low heating requirements, use of roofs with low solar absorptance can represent meaningful energy savings. (ERA citation 11:038144)
Changes in Building Heating and Cooling Requirements Due to a Reduction in the Roof's Solar Absorptance
Sunlit surfaces of buildings experience higher temperatures during hours of solar exposure than those experienced by unexposed surfaces. The solar radiation incident on building exterior surfaces may in turn affect the heating and cooling loads imposed on the building's HVAC system. An increase in surface temperature due to insolation increases heat gain during the summer and reduces heating loss during the winter. Since this is a counteracting influence with regard to energy usage, questions arise as to how annual HVAC energy requirements are changed when a surface's radiative properties are altered. The reported study focused specifically on changes in heating and cooling loads when the roof's solar absorptance was reduced from 0.8 to 0.3. Calculations were made using DOE-2.1B for two different buildings at twenty different cities. A third building type was examined for five of the locations. The paper presents the calculated load changes in the form of bar graphs. The magnitude of the load changes are shown to be significantly influenced by the convective coefficient. For locations of high solar intensity and low heating requirements, use of roofs with low solar absorptance can represent meaningful energy savings. (ERA citation 11:038144)
Changes in Building Heating and Cooling Requirements Due to a Reduction in the Roof's Solar Absorptance
E. I. Griggs (author) / G. E. Courville (author)
1985
43 pages
Report
No indication
English
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