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Experimental comparison of local direct heating to improve thermal comfort of workers

机译：局部直接加热试验比较，提高工人热舒适性

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摘要

This study aims to investigate the effect of wearable local heating devices on the thermal comfort of workers doing handwork in cold environments. Experiments were carried out by using local radiant heating, ankle heating, wrist heating, torso heating, and combined heating, which were compared with no heating conditions. Twenty subjects participated in the experiments under air temperature conditions of 13 and 15 degrees C. The participants were asked to perform three activities: standing, assembling screws, and assembling small shelves. Subjective questionnaires pertaining to overall thermal sensation, local thermal comfort of hands, and thermal comfort were collected. The mean skin temperature (MST) was measured. The results show that some of the local direct heating improves subjects' overall thermal sensation, local thermal sensation of hands, and thermal comfort significantly. These methods include torso heating and the combined heating. Moreover, subjects' MST and working efficiency are also increased. The working efficiency is found to be related closely to local thermal sensation of hands. Although wrist heating does not improve the thermal sensation significantly, it improves the thermal sensation of hands and the work efficiency effectively. The analysis shows that local thermal sensation of hands is linearly related to the overall thermal sensation. When the local thermal sensation of hands is neutral, the overall thermal sensation would be slightly warm, and subjects would feel more comfortable. Compared to local radiant heating, these wearable heating devices are more efficient, in that they improve thermal comfort and working efficiency better with a lower energy cost.
机译：本研究旨在探讨可穿戴本地加热装置对寒冷环境手工的工人热舒适性的影响。通过使用局部辐射加热，脚踝加热，腕部加热，躯干加热和组合加热来进行实验，而没有加热条件。二十个受试者参加了在13和15摄氏度的空气温度条件下的实验。被要求参与者进行三项活动：站立，组装螺钉和组装小型货架。收集了与总热敏，局部热舒适的手和热舒适性有关的主观问卷。测量平均皮肤温度（MST）。结果表明，一些本地直接加热可提高受试者的主体热敏，手中的局部热敏感觉和显着热舒适性。这些方法包括躯干加热和组合加热。此外，受试者的MST和工作效率也增加。发现工作效率与手中的局部热感染密切相关。虽然手腕加热不会显着提高热敏感觉，但它有效地提高了手和工作效率的热敏感觉。分析表明，双手的局部热感染与整体热敏线性有关。当手中的局部热敏感觉是中性时，总热敏感觉会略微温暖，受试者会感觉更舒适。与局部辐射加热相比，这些可穿戴的加热装置更有效，因为它们以较低的能量成本更好地提高热舒适度和工作效率。

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