作为在国家实验室屋顶热研究装置（RTRA）上进行的一系列试验之一，在18个月的时间内，研究了隔热低坡屋顶上黑白膜的热效应。隔热屋顶测试面板的一半——4英尺×8英尺表面——被黑色聚异丁烯（PIB）膜覆盖。在另一半上安装了白色PIB膜。这两个部分都使用玻璃纤维板进行了相同的绝缘，以提供7.5 hr-ft2-F/Btu的标称热阻。热通量传感器安装在每个部分的中心，热电偶放置在薄膜下方、中间平面和绝缘层下方。 每小时记录当地天气数据、样本热流和温度数据。报告了黑白膜测量数据的季节差异。包括累积和瞬时热通量以及每小时表面温度变化。观察到膜的峰值温度在白天相差高达50华氏度。夜间膜表面温度的差异可以忽略不计。根据屋顶膜处的能量平衡和反射计测量结果计算的表面反射率值中，观察到了由于污垢积聚和局部环境因素引起的变化。 本文报告的实验结果目前正用于验证表面效应对屋顶系统性能和建筑能源需求的数值模拟。建模和分析的结果将在随后的论文中报告。单位:I-PCITION:研讨会，ASHRAE交易，1988年，第94卷，pt。2、渥太华

The thermal effects of black versus white membranes on an insulated low-slope roof were studied over an 18-month period as one of a series of tests conducted on the Roof Thermal Research Apparatus (RTRA) at a national laboratory.Half of the insulated roof tests panel’s 4 ft x 8 ft surface~was covered with a black polyisobutylene (PIB) membrane. A white PIB membrane was installed over the other half. Both sections were identically insulated with fiberglass board to provide a nominal thermal resistance of 7.5 hr-ft2-°F/Btu. A heat flux transducer was installed in the center of each section with thermocouples placed below the membrane, at the midplane and beneath the insulation. Local weather data together with specimen heat flux and temperature data were recorded hourly.Seasonal distinctions in measured data between the black and white membranes are reported. Included are cumulative and instantaneous heat fluxes and hourly surface temperature variations. Peak membrane temperatures were observed to differ by up to 50 F during the day. Nighttime differences in membrane surface temperatures were negligible.Changes due to dirt accumulation and local environmental factors were observed in surface reflectance values calculated from the energy balance at the roof membrane and from reflectometerm easurements.The experimental results reported here are currently being used to validate numerical modeling of surface effects upon roof system performance and building energy requirements. The results of the modeling and analysis will be reported in a subsequent paper.Units: I-P