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Thermal comfort guidelines for production spaces within multi-storey garment factories located in Bangladesh

机译：孟加拉国多层服装工厂内生产空间的热舒适准则

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摘要

This research presents extensive field data on indoor thermal conditions along with workers' comfort votes taken at their workstations within three existing multi-storied garment factories during the three seasons (cool-dry, hot-dry and warm-humid) of Bangladesh. The main objective of the study was to observe the impact of thermal conditions on workers' indoor thermal perception during each season of a year and from this identify thermal comfort guidelines (e.g. neutral temperatures, comfort ranges, preferred airspeeds and directions) to execute their production work comfortably. Subjective votes were collected from a total of 908 workers with the thermal data, physiological data and adaptive measures recorded simultaneously. Statistical analyses revealed that workers can accept a wider and relatively higher comfort range than the predicted band during cool-dry and hot-dry seasons, for instance, 22.7-29.1 degrees C and 22.3-30.4 degrees C respectively. A narrower comfort band (e.g. 28.7-30.9 degrees C), close to the predicted range, was found during the warm-humid season, which can be maintained by reducing radiant temperature and elevating airspeed. Further analyses indicated that workers prefer a mean airspeed of 0.3 m/s and comfort range of 0-3.0 m/s specific to their activities preferably from inlets located on south, north and east facades while upward and downward air movement, from for example ceiling fans, causes a rise of air temperature in the occupational zone and thermal discomfort. This research also suggested that the maximum distances of workstations from the ventilation inlets (windows) should be maintained at 12-18 m for sufficient cross ventilation, personal controls and adaptive opportunities to help maintain preferred thermal condition.
机译：这项研究提供了有关孟加拉国三个季节（凉爽干燥，炎热干燥和温暖潮湿）三个室内现有多层服装工厂的工人在室内温度条件下获得的广泛现场数据以及工人在其工作站上的舒适度投票。该研究的主要目的是观察一年中每个季节的热状况对工人室内热感知的影响，并据此确定热舒适准则（例如中性温度，舒适范围，首选空速和方向）以执行生产工作舒适。从总共908名工人中收集了主观票，同时记录了热量数据，生理数据和适应性措施。统计分析表明，在凉爽干燥季节和炎热干燥季节，工人所接受的舒适度范围比预测的范围宽，并且相对较高，例如分别为22.7-29.1摄氏度和22.3-30.4摄氏度。在暖湿季节发现了较窄的舒适带（例如28.7-30.9摄氏度），接近预测范围，可以通过降低辐射温度和提高空速来保持舒适带。进一步的分析表明，工人更喜欢根据自己的活动选择的平均空速为0.3 m / s，舒适度范围为0-3.0 m / s，最好从位于南，北和东立面的进气口进行向上和向下的空气流动，例如从天花板风扇，会导致职业区域内的空气温度升高和热不适。这项研究还建议，工作站与通风口（窗户）的最大距离应保持在12-18 m，以确保足够的交叉通风，个人控制和适应性机会，以帮助维持理想的热状况。

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