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The objective of the study was to validate the DLE (duration limited exposure) index, which provides a method to determine acceptable time limits when, in a cold environment, clothing insulation is not sufficient to protect the wearer from body cooling. The thermal responses of ten male subjects dressed in winter clothing to −6, −14 and −22°C during very light exercise were studied. The individual variation of peripheral temperature responses was large. The majority of the subjects stated that they would accept the exposure once a day, but not continuously. DLE was on the ‘safe side' according to the body net heat debt and rectal temperature, but at the same time it allowed for low skin temperatures, especially of the extremities at low ambient temperatures. At predicted time limits, the mean skin temperature criteria of DLE suggested in the ISO document ISO/TR 11079 were not met at −14 and −22°C. Introduction of limit criteria for extremity cooling in prediction models would render a more complete assessment of cold stress.Relevance to industrySince the protective clothing worn by the worker is not always sufficient for the actual low ambient temperature there is a need for accurate predictions of exposure time.  相似文献
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基于CFD理论,应用STAR-CCM+仿真某发电列车车下燃油箱在给定高寒工况下的保温性能.在考虑列车运行时车外流场影响的基础上,耦合分析箱体、保温材料和燃油等的温度分布特性,找出燃油可能发生结蜡的区域.给出相关分析结论和改进建议,为保证燃油箱拥有稳定的工作性能提供可靠的设计参考.  相似文献
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