在评估人类对热环境的反应方面，工程师和生理学家越来越感兴趣的是穿着时评估衣服绝缘性的简单直接方法。任何环境的有效温度ET*（ASHRAE标准55-74）不仅与温度（干球、湿球和平均辐射）有关，还与空气流动和所穿衣服的隔热性能有关。除衣物隔热外，所有这些环境因素都是供暖、通风和空调工程师的常规测量。引文:ASHRAE交易，第82卷，第2部分，华盛顿州西雅图

Simple and direct methods for evaluation of clothing insulation while worn are becoming of increasing interest to engineers and physiologists in the evaluation of human responses to the thermal environment. The effective temperature ET* (of ASHRAE STANDARD 55-74) of any environment is a function not only of temperature -- dry bulb, wet bulb and mean radiant -but also of air movement present and the insulation of clothing worn. All these environmental factors, except clothing insulation, are routine measurements to heating, ventilating and airconditioning engineers.