通常通过比较稳态传热系数（如U值和R值）来评估替代墙体系统。稳态传输系数不能充分描述动态温度条件下的热性能。在稳态和动态温度条件下测试的建筑围护结构部件的实验室结果可用于开发更准确地预测建筑围护结构热损失和热增益的方法。根据ASTM C976标准，使用校准热箱测量了21个墙体组件的热特性，包括不同类型的砌体和木框架墙以及两个标准校准组件。呈现稳态、瞬态和周期性性能的结果已汇编在两本手册中。 本文总结了研究结果。稳态值用于获得平均传热系数，如U值和R值，并将测量值与根据材料特性计算的值进行比较。瞬态和周期性动态测试提供受控条件下的热性能数据，模拟建筑围护结构中的实际温度变化。将测量结果与稳态分析预测的值进行比较。测量结果和预测结果之间的差异通常是由于组件的蓄热能力造成的。单位:双引文:研讨会，ASHRAE交易，1986年，第92卷，pt。2B，波特兰，或

Alternative wall systems are frequently evaluated by comparing steady-state heat transmission coefficients, such as U- and R-values. Steady-state transmission coefficients do not adequately describe thermal performance under dynamic temperature conditions. Laboratory results of building envelope components tested under steady-state and dynamic temperature conditions can be used to develop methods of more accurately predicting heat losses and gains to the building envelope.The thermal characteristics of 21 wall assemblies, including different types of masonry and wood-frame walls and two standard calibration assemblies, have been measured using a calibrated hot box in general accordance with ASTM C976. Results presenting steady-state, transient, and periodic performance have been assembled in two manuals.This paper summarizes the results. Steady-state values are used to obtain average heat transmission coefficients such as U- and R-values, and the measured values are compared to those calculated from material properties. The transient and periodic dynamic tests provide data on thermal performance under controlled conditions that simulate actual temperature changes in building envelopes. Measured results are compared to values predicted by steady-state analysis. The difference between measured and predicted results is shown to be due in general to thermal storage capacity of the assembly.Units: Dual