Effects of mine strata thermal behavior and mine initial temperatures on mobile refuge alternative temperature.

D S Yantek, L Yan, P T Bissert, M D Klein
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引用次数: 9

Abstract

Federal regulations require the installation of refuge alternatives (RAs) in underground coal mines. Mobile RAs have a limited ability to dissipate heat, and heat buildup can lead to a life-threatening condition as the RA internal air temperature and relative humidity increase. The U.S. National Institute for Occupational Safety and Health (NIOSH) performed heat testing on a 10-person tent-type training RA and contracted ThermoAnalytics Inc. to develop a validated thermal simulation model of the tested RA. The model was used to examine the effects of the constant mine strata temperature assumption, initial mine air temperature, initial mine strata surface temperature (MSST), initial mine strata temperature at depth (MSTD) and mine strata thermal behavior on RA internal air temperature using 117 W (400 Btu/h) of sensible heat input per simulated miner. For the studied RA, when the mine strata temperature was treated as a constant, the final predicted RA internal air temperature was 7.1°C (12.8°F) lower than it was when the mine strata thermal behavior was included in the model. A 5.6°C (10.0°F) increase in the initial MSST resulted in a 3.9°C (7.1°F) increase in the final RA internal air temperature, whereas a 5.6°C (10°F) increase in the initial MSTD yielded a 1.4°C (2.5°F) increase in the final RA internal air temperature. The results indicate that mine strata temperature increases and mine strata initial temperatures must be accounted for in the physical testing or thermal simulations of RAs.

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矿山地层热行为和矿山初始温度对移动避难所替代温度的影响。
联邦法规要求在地下煤矿安装替代避难所(RAs)。移动RA的散热能力有限,随着RA内部空气温度和相对湿度的增加,热量的积累可能导致危及生命的情况。美国国家职业安全与健康研究所(NIOSH)对一个10人帐篷式训练RA进行了热测试,并与ThermoAnalytics公司签订合同,为被测试RA开发一个经过验证的热模拟模型。利用该模型,以每个模拟矿工117 W (400 Btu/h)的显热输入,考察了恒定矿井地温假设、初始矿井空气温度、初始矿井地表温度(MSST)、初始矿井深层温度(MSTD)和矿井地热行为对RA内部空气温度的影响。对于所研究的RA,当矿井地层温度作为一个常数时,最终预测的RA内部空气温度比考虑矿井地层热行为时低7.1°C(12.8°F)。初始MSTD增加5.6°C(10.0°F)导致最终RA内部空气温度增加3.9°C(7.1°F),而初始MSTD增加5.6°C(10°F)导致最终RA内部空气温度增加1.4°C(2.5°F)。结果表明,在物理试验或热模拟中,必须考虑矿井地层温度升高和矿井地层初始温度。
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