Lu Yehu, Wei Fanru, Lai Dandan, Shi Wen, Wang Faming, Gao Chuansi, Song Guowen
Laboratory for Clothing Physiology and Ergonomics (LCPE), The National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China; Department of Fashion Design and Engineering, College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China.
Department of Fashion Design and Engineering, College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China.
J Therm Biol. 2015 Aug;52:137-46. doi: 10.1016/j.jtherbio.2015.07.002. Epub 2015 Jul 8.
Personal cooling systems (PCS) have been developed to mitigate the impact of severe heat stress for humans working in hot environments. It is still a great challenge to develop PCSs that are portable, inexpensive, and effective. We studied the performance of a new hybrid PCS incorporating both ventilation fans and phase change materials (PCMs). The cooling efficiency of the newly developed PCS was investigated on a sweating manikin in two hot conditions: hot humid (HH, 34°C, 75% RH) and hot dry (HD, 34°C, 28% RH). Four test scenarios were selected: fans off with no PCMs (i.e., Fan-off, the CONTROL), fans on with no PCMs (i.e., Fan-on), fans off with fully solidified PCMs (i.e., PCM+Fan-off), and fans on with fully solidified PCMs (i.e., PCM+Fan-on). It was found that the addition of PCMs provided a 54∼78min cooling in HH condition. In contrast, the PCMs only offered a 19-39min cooling in HD condition. In both conditions, the ventilation fans greatly enhanced the evaporative heat loss compared with Fan-off. The hybrid PCS (i.e., PCM+Fan-on) provided a continuous cooling effect during the three-hour test and the average cooling rate for the whole body was around 111 and 315W in HH and HD conditions, respectively. Overall, the new hybrid PCS may be an effective means of ameliorating symptoms of heat stress in both hot-humid and hot-dry environments.
个人冷却系统（PCS）已被开发出来，以减轻在炎热环境中工作的人员所面临的严重热应激影响。开发出便携式、低成本且有效的PCS仍然是一项巨大挑战。我们研究了一种结合了通风风扇和相变材料（PCM）的新型混合PCS的性能。在两种炎热条件下，即在热湿（HH，34°C，75%相对湿度）和热干（HD，34°C，28%相对湿度）环境中，在一个出汗人体模型上研究了新开发的PCS的冷却效率。选择了四个测试场景：风扇关闭且无PCM（即风扇关闭，作为对照）、风扇开启且无PCM（即风扇开启）、风扇关闭且PCM完全固化（即PCM + 风扇关闭）以及风扇开启且PCM完全固化（即PCM + 风扇开启）。结果发现，在HH条件下，添加PCM可提供54至78分钟的冷却效果。相比之下，在HD条件下，PCM仅提供19至39分钟的冷却效果。在两种条件下，与风扇关闭相比，通风风扇极大地增强了蒸发散热。混合PCS（即PCM + 风扇开启）在三小时测试期间提供了持续的冷却效果，在HH和HD条件下，全身的平均冷却速率分别约为111瓦和315瓦。总体而言，这种新型混合PCS可能是缓解热湿和热干环境中热应激症状的有效手段。
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