阅读量：

117

作者：

Ronnen Levinson，Hashem Akbari，Joseph C. Reilly

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摘要：

Owners of homes with pitched roofs visible from ground level often prefer non-white roofing products for aesthetic considerations. Non-white, near-infrared-reflective architectural coatings can be applied in situ to pitched concrete or clay tile roofs to reduce tile temperature, building heat gain, and cooling power demand, while simultaneously improving the roof's appearance. Scale-model measurements of building temperature and heat-flux were combined with solar and cooling energy use data to estimate the effects of such cool-roof coatings in various California climates. Under typical conditions—e.g., house with R-11 attic insulation and no radiant barrier, reducing roof absorptance by 0.3 yields whole-house peak power savings of 230W in Fresno, 210W in San Bernardino, and 210W in San Diego. The corresponding absolute and fractional cooling energy savings are , 1.1ton x, and 0.86ton x. The economic value of cooling energy savings is well below the cost of coating a tile roof, but the simple payback times for using cool pigments in a roof tile coating are modest (5–7yr) in the warm climates of Fresno and San Bernardino.

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关键词：

Cool coating Near-infrared reflectance Solar reflectance Building simulation Cooling energy Cooling power California Cool roof

DOI：

10.1016/j.buildenv.2006.06.005

被引量：

150

年份：

2007