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Thermal Problems in Hyperbaric Environments

机译:高压环境中的热问题

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This paper reviews thermal problems in hyperbaric environments and provides information how to estimate thermal comfort zones in hyperbaric environments.rnDivers are exposed to hyperbaric helium-oxygen atmospheres when engaged in saturation diving operations. However, some difficulties to control thermal environments arise from the extremely high thermal conductivity of helium used as a breathing gas and from increased pressure. In order to obtain data available for control of thermal environments, many theoretical and empirical studies have been carried out to estimate heat exchange between man and his environments. For example, male divers wearing different clothing ensembles were exposed to six different pressures for evaluating change in clothing insulation. In addition, a lightly clothed male diver exercised on a bicycle ergometer while exposed to five different pressures to evaluate changes in clothing permeability. The results demonstrated that clothing insulation decreased with change in ambient gases and clothing permeability decreased slightly despite changes in ambient gas and barometric pressure.rnAs represented by this example, in hyperbaric helium-oxygen atmospheres, the manner of heat exchange between man and his environments becomes apparently different from that in normobaric air. The last part of this paper demonstrates the comfort range of ambient temperatures at increased barometric pressures.
机译:本文回顾了高压环境中的热问题,并提供了有关如何估算高压环境中的热舒适区的信息。潜水员在进行饱和潜水操作时会暴露于高压氦氧气氛中。然而,由于用作呼吸气体的氦气的极高导热率和压力升高,在控制热环境方面存在一些困难。为了获得可用于控制热环境的数据,已经进行了许多理论和经验研究来估计人与环境之间的热交换。例如,穿着不同服装的男潜水员要承受六种不同的压力,以评估服装隔热性的变化。此外,一名穿着轻便的男潜水员在自行车测功计上锻炼,同时受到五种不同压力的影响,以评估衣物渗透性的变化。结果表明,尽管环境气体和大气压力有所变化,但衣服的隔热性却随环境气体的变化而降低,而衣服的渗透性也略有下降.rn以本示例为代表,在高压氦氧气氛中,人与环境之间的热交换方式变为与常压空气中的明显不同。本文的最后一部分演示了在大气压力增加时环境温度的舒适范围。

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