近年来，许多发展需要改进方法，以便准确预测建筑物供暖和制冷的负荷分布和能源需求。这些发展包括现代建筑和施工实践、用于控制建筑环境的能源数量增加、使用总能源系统以及使用计算机进行系统控制。目前公认的负荷计算技术也利用瞬态传热计算。例如，等效温差（BTD）法基于瞬态考虑。BTD方法虽然可能更便于设计，但对于处理非标准室外太阳能和温度条件的能量计算来说不够灵活。 拟议的ASHRAB计算技术（参考文献1）利用瞬态传热计算来获得结构的响应系数。因此，热储存是直接考虑的。为了验证这个提议的程序，阿什拉布正在赞助一个分两阶段的项目。引文:巴哈马拿骚ASHRAE Transactions第78卷第2部分

In recent years, a number of developments have evolved which require improved methods for accurately predicting load profiles and energy requirements for the heating and cooling of buildings. Among these developments are modern architectural and construction practices, the increased number of energy sources used for controlling building environments, use of total energy systems, and use of computers for system control.Currently accepted load calculation techniques also utilize transient heat transfer calculations. The equivalent temperature differential (BTD) method, for example, is based on transient considerations. The BTD method, while possibly more convenient for design purposes, is not flexible enough for energy calculations dealing with nonstandard outdoor solar and temperature conditions. The proposed ASHRAB calculation technique (Ref 1) utilizes transient heat transfer calculations to obtain response factors for structures. Therefore, thermal storage is accounted for directly.In order to validate this proposed procedure, ASHRAB is sponsoring a two-phase program.