ASHRAE每四年在ASHRAE手册基础知识中发布制冷剂的热性能和传输性能数据。然而，这些数据并不是恒定不变的，多年来随着各种版本的发布而变化。这种按时间顺序变化的主要原因是，在已发表的文献中，定期提供反映改进测量技术的修订属性信息。研究了四种制冷剂的时间特性变化，它们代表了一系列空调和制冷应用。R-22、R-134a、R-410a和R-600a在40°F和100°F（4.4°C和37.8°C）的典型可能冷凝和蒸发温度下进行评估。具体而言，研究了五种性质的汽相和液相:密度、比热、焓、粘度、导热系数以及表面张力。 从1981年版《美国陆军手册-基础》开始，将这些属性的值与2017年的参考值进行比较，并与各版本发布的值进行比较。研究发现，在极端情况下，热力学和输运性质数据相对于2017年版的值变化近30%，版本之间的变化高达25%，现代版具有稳定效应。引用:2019年年度会议，密苏里州堪萨斯城，技术论文

ASHRAE publishes thermal and transport property data for refrigerants in ASHRAE Handbook—Fundamentals every four years. However, this data is not constant, varying over the years with various releases. The main reason for this chronological variation is that revised property information, reflecting improved measurement techniques, is periodically made available in published literature.Chronologicalproperty vari-ations are investigated for four refrigerants that are represen-tative of a range of air-conditioning and refrigeration applications. R-22, R-134a, R-410a, and R-600a are evaluated at the representative possible condensation and evaporation temperatures of 40°F and 100°F (4.4°C and 37.8°C). Specifically, the vapor and liquid phases of five properties—density, specific heat, enthalpy, viscosity, and thermal conductivity, as well as surface tension—were examined. Values of these properties, starting with the 1981 edition ofASHRAEHandbook— Fundamentals are compared to 2017 reference values and also compared to values published from edition to edition. It was found that, in the extreme case, thermodynamic and transport property data can vary by nearly 30% with respect to the 2017 edition values and up to 25% between editions with a stabilizing effect appearing with modern editions.