Effectiveness of an air-cooled vest using selected air temperature and humidity combinations.
Effectiveness of an air-cooled vest using selected air temperature and humidity combinations.
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使用选定的空气温度和湿度组合的风冷背心的有效性。
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
C. Wenger
中科院分区：
文献类型：
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作者：
N. Pimental;H. M. Cosimini;M. Sawka;C. Wenger
我们评估了风冷背心在减少穿着化学防护服的高温（49 摄氏度干球 (db)、20 摄氏度露点 (dp)）下运动的受试者的热应变方面的有效性。四名男性受试者尝试以两种代谢率（175 和 315 W）、六种冷却组合（对照（无背心）和五种不同的 db 和 dp 组合）进行 300 分钟的高温暴露。以 15 scfm 的速度向背心供应的空气范围为20-27 摄氏度 db，7-18 摄氏度 dp；理论冷却能力为 498-687 W。不带背心的持久时间为 118 分钟（175 W）和 73 分钟（315 W）。带背心的持久时间为 300 分钟（175 W）和 242-300 分钟（315 W）。尽管在较低的干球温度下提供空气时背心会更有效，但在 175 瓦时，受试者可以保持恒定的体温；在 315 瓦时，背心的延长耐力的能力仅限于 5 小时左右。
We evaluated the effectiveness of an air-cooled vest in reducing thermal strain of subjects exercising in the heat (49 degrees C dry bulb (db), 20 degrees C dew point (dp] in chemical protective clothing. Four male subjects attempted 300-min heat exposures at two metabolic rates (175 and 315 W) with six cooling combinations--control (no vest) and five different db and dp combinations. Air supplied to the vest at 15 scfm ranged from 20-27 degrees C db, 7-18 degrees C dp; theoretical cooling capacities were 498-687 W. Without the vest, endurance times were 118 min (175 W) and 73 min (315 W). Endurance times with the vest were 300 min (175 W) and 242-300 min (315 W). The five cooling combinations were similarly effective in reducing thermal strain and extending endurance time, although there was a trend for the vest to be more effective when supplied with air at the lower dry bulb temperature. At 175 W, subjects maintained a constant body temperature; at 315 W, the vest's ability to extend endurance is limited to about 5 hours.