Roof Heating and Cooling Loads in Various Climates for the Range of Solar Reflectances and Infrared Emittances Observed for Weathered Coatings

摘要

Twenty-foure low-slope roof coating systems and four uncoated specimens have been in place since June 1997, exposed to the Knoxyville, Tennessee climate. Local weather conditions, temperatures from top to bottom of each 2 ft x 2 ft (0.61 m x 0.61 m) test section adn heat flux through the wood fiberboard roof insulation for each test section have been recorded continuously. Periodically, each surface's reflectance over the solar spectrum and emittance in the infrared have been measured in-situ. These data permit direct validation of a computer program for onedimensional, transient analysis of roof thermal performance.