Nag P K, Pradhan C K, Nag A, Ashtekar S P, Desai H
Ergonomics Division, National Institute of Occupational Health, Ahmedabad, India.
Ergonomics. 1998 Feb;41(2):179-87. doi: 10.1080/001401398187233.
The efficacy of a water-cooled jacket for auxiliary body cooling was examined under a simulated hot environment. The personal garment comprised of a water re-circulating three-layered vest of cotton fabric lined with 2 mm diameter latex tubing and inter-spaced coating of rubberized solution. Four subjects wearing the water-cooled jacket were tested in the environment chamber (30, 35 and 40 degrees C DB, 50-60% RH, air velocity 0.3, 0.6 and 0.9 m/s, with corresponding average effective temperature of 26 +/- 2.3, 33 +/- 1.1 and 36 +/- 1.5 degrees C). The inlet water temperature was maintained at 10-12 degrees C, with flow rates of 2.6 +/- 0.3, 4.3 +/- 0.3 and 5.1 +/- 0.3 l/h). At 30 degrees C DB, variation in water flow had marginal effect on microclimate, while at higher temperatures (35 and 40 degrees C DB), the re-circulating cooled water had noticeable effects in lowering microclimate, trunk and other skin temperatures, and maintaining the body core within 36.7 +/- 0.2 to 37.5 +/- 0.2 degrees C, over 2 h exposure at 35 and 40 degrees C DB. The observation indicates that the water-cooled jacket provided auxiliary cooling to maintain comfortable microclimate, skin and body core temperatures. This enabled subjects to sustain comfortable heat balance over 2 h heat exposure without any noticeable heat strain.
在模拟热环境下，对水冷夹克辅助身体降温的效果进行了研究。个人服装由一件水再循环的三层棉质背心组成，背心里衬有直径2毫米的乳胶管，并间隔涂有橡胶溶液。四名穿着水冷夹克的受试者在环境舱中进行了测试（干球温度为30、35和40摄氏度，相对湿度为50-60%，风速为0.3、0.6和0.9米/秒，相应的平均有效温度为26±2.3、33±1.1和36±1.5摄氏度）。进水温度保持在10-12摄氏度，流速分别为2.6±0.3、4.3±0.3和5.1±0.3升/小时。在30摄氏度干球温度下，水流变化对微气候的影响很小，而在较高温度（35和40摄氏度干球温度）下，再循环的冷却水在降低微气候、躯干和其他皮肤温度以及在35和40摄氏度干球温度下暴露2小时期间将身体核心温度维持在36.7±0.2至37.5±0.2摄氏度方面有显著效果。观察结果表明，水冷夹克提供了辅助降温，以维持舒适的微气候、皮肤和身体核心温度。这使得受试者在2小时的热暴露期间能够维持舒适的热平衡，而没有任何明显的热应激。
