了解或测量金属建筑屋顶和墙壁系统中安装的隔热型材，以确定具有可接受精度的有效热阻，这一点至关重要。防护热箱测试和有限元模型可能是精确的，但只有当建模的横截面正确地表示实际构造的绝缘系统时，才是精确的。与向ASHRAE SSPC 90.1围护结构小组委员会报告的金属建筑工作组的其他成员合作，我们制定了金属建筑隔热系统的修改热传导率值的建议，以反映本文中解释的当前常见施工实践。 ASHRAE 90.1的当前版本将屋顶和墙壁的檩条隔热层的热性能高估了约20%。单位:双引文:ASHRAE交易，第116卷，第。2010年奥兰多

It is critical to know or measure the installed insulation profile in metal building roof and wall systems to determine the effective thermal resistance with acceptable accuracy. Guarded hot box tests and finite element models can be precise, but are accurate only if the modeled cross-sections correctly represent the insulation system as practically constructed. In cooperation with others on the Metal Building Task Group reporting to the ASHRAE SSPC 90.1 Envelope Subcommittee, we developed recommendations for modified thermal transmittance values for metal building insulation systems to reflect current common construction practices as explained in this paper. The current version of ASHRAE 90.1 over-estimates the thermal performance of “over-the-purlin” insulation for roofs and walls by approximately 20%.Units: Dual