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Cool Roofs: How and Why They Generate Energy Savings

This article describes the development of a web-based “fact sheet” on radiation control for commercial low-slope roofing systems. This fact sheet includes an estimating tool or “calculator” to predict the heating and cooling loads per unit area of low-slope roof. The user of the “calculator” specifies surface radiation properties (solar reflectance and infrared emittance), insulation level, and location for the roof.

Product Number: 41207-322-SG
Author: André O. Desjarlais, Thomas W. Petrie, William A. Miller
Publication Date: 2007
Industry: Coatings
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This article describes the development of a web-based “fact sheet” on radiation control for commercial low-slope roofing systems. This fact sheet includes an estimating tool or “calculator” to predict the heating and cooling loads per unit area of low-slope roof. The user of the “calculator” specifies surface radiation properties (solar reflectance and infrared emittance), insulation level, and location for the roof. The fact sheet presents the range of radiation properties that resulted from our tests and other information to guide the user of the tool in applying it to conditions of interest. The user then enters local energy costs and average equipment efficiencies to generate annual operating cost savings due to the proposed surface radiation properties and insulation level.

This article describes the development of a web-based “fact sheet” on radiation control for commercial low-slope roofing systems. This fact sheet includes an estimating tool or “calculator” to predict the heating and cooling loads per unit area of low-slope roof. The user of the “calculator” specifies surface radiation properties (solar reflectance and infrared emittance), insulation level, and location for the roof. The fact sheet presents the range of radiation properties that resulted from our tests and other information to guide the user of the tool in applying it to conditions of interest. The user then enters local energy costs and average equipment efficiencies to generate annual operating cost savings due to the proposed surface radiation properties and insulation level.

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