This study aims to investigate the heat transfer mechanism of the uniforms used by people working in hot, humid and windy environments. Furthermore, the effectiveness of an opening structure added to the armpit of the uniforms in improving thermal comfort was comparatively examined.,A set of uniforms was tested with the opening at the armpit alternatively zipped or unzipped. Thermal manikin and human tests were performed in a climatic chamber simulating the specific environmental conditions, including wind speeds at four levels (0.15, 0.5, 2, 4 m/s) and relative humidities at two levels (50 and 85%). Static and dynamic thermal insulations of clothing (IT) were examined by the thermal manikin tests. The human bodies' thermal responses, including heart rates (HR), eardrum temperatures (Te), skin temperatures (Tsk) and subjective perceptions, were given by the human tests.,Special mechanisms of heat transfer in the specific uniforms used in tropical monsoon climates were revealed. Reductions on IT were caused by the movement of the human body and the environmental wind, and the empirical equations would underestimate this reduction. The opening at the armpit was able to prompt more heat transfer under dynamic condition, with reducing the IT by 11.8%, lowering the mean Tsk by 0.92°C, and significantly improving the subjective perceptions (p < 0.05). The heat exhaustion was alleviated with lowering the Te by 0.32°C.,This study managed to improve the thermal performance of uniforms for workers under unforgiving conditions. The evaluation and design methods introduced by this study provided practical guidance for similar products with strict dress codes and cost control requirements based on the findings from thorough product tests and analysis.

中文翻译：

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热带季风气候下工作人员制服热舒适性调查

本研究旨在研究在炎热、潮湿和多风环境中工作的人们所使用的制服的传热机制。此外，还比较了在制服腋下增加开口结构在改善热舒适性方面的有效性。测试了一套制服，腋下开口交替拉上或拉开。热模型和人体测试在模拟特定环境条件的气候室中进行，包括四个级别（0.15、0.5、2、4 m/s）的风速和两个级别（50% 和 85%）的相对湿度。服装 (IT) 的静态和动态隔热材料通过热人体模型测试进行了检查。人体的热反应，包括心率 (HR)、鼓膜温度 (Te)、皮肤温度 (Tsk) 和主观感知，人体试验给出了热传递的特殊机制，揭示了热带季风气候中使用的特定制服的特殊传热机制。IT 的减少是由人体运动和环境风引起的，经验公式会低估这种减少。腋下开口在动态条件下能够促进更多的热传递，IT降低11.8%，平均Tsk降低0.92°C，主观感知显着改善（p < 0.05）。将 Te 降低 0.32°C 可以缓解热衰竭。这项研究成功地改善了工人在恶劣条件下工作服的热性能。