本文是对玻璃纤维隔热金属建筑屋顶隔热组件传热建模综合研究的第二部分。第1部分描述了金属建筑屋顶隔热组件中传热（和气流，如适用）的综合三维数学模型的开发和实验验证。该模型用于计算多个立缝屋顶（SSR）和贯穿式固定屋顶（TFR）组件的U系数，假设檩条之间的隔热帘为抛物线。 工作的第二部分使用第1部分中描述的模型的结果，开发了一种相对简单的方法来预测隔热金属建筑屋顶隔热组件的总传热系数（U系数）。结果表明，使用数值模型获得的U系数可能与整体或系统热阻参数有相当高的相关性（R2=0.998），如下所示。1/U=0.8672 Rinsul sys+1.132在上述等式中，U表示Btu/ft2·h·F，R表示ft2·h·F/Btu。 1 Btu/ft2·h·F=5.6782 W/m2·K和1 ft2·h·F/Btu=0.17611 m2·K/W。参数Rinsul sys通过组合并联运行的三个热阻计算得出。等值电阻中的两个对应于檩条两侧的绝缘帘，中间的一个代表绝缘在檩条上的热阻。推导了抛物线形隔热帘R值的解析表达式。本文提出的方法极大地提高了我们预测U- 金属建筑屋顶组件的系数。单位:双引文:ASHRAE交易，第116卷，第。2010年奥兰多

The paper represents the second part of a comprehensive study on modeling heat transfer in metal building roof insulation assemblies containing fiberglass insulation. Part 1 described the development and experimental validation of a comprehensive three-dimensional mathematical model for heat transfer (and air flow where applicable) in metal building roof insulation assemblies. The model was used to calculate U-factors for several standing seam roof (SSR) and throughfastened roof (TFR) assemblies assuming the insulation drapes between the purlins to be parabolic. The second part of the work used the results from the model described in part 1 to develop a relatively simple approach to predict the overall heat transfer coefficient (U-factor) of insulated metal building roof insulation assemblies. It is shown that the U-factors obtained using the numerical model may be correlated, to a fairly high degree (R2 = 0.998), to an overall or system thermal resistance parameter, Rinsul-sysas shown below.1/U = 0.8672 Rinsul-sys+ 1.132In the above equation, U is in Btu/ft2·h·°F and R is in ft2·h·°F/Btu. 1 Btu/ft2·h·°F = 5.6782 W/m2·K and 1 ft2·h·°F/Btu = 0.17611 m2·K/W.The parameter Rinsul-sysis calculated by combining three thermal resistances operating in parallel. Two of these resistances of equal value correspond to the insulation drapes on either side of the purlin and the one in the middle represents the thermal resistance of insulation over the purlin. An analytical expression for the R-value of the parabolic insulation drape is derived. The approach developed in this paper greatly enhances our ability to predict U-factors for metal building roof assemblies.Units: Dual