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        Thermal Performance Analysis of an Underground Closed Chamber with Human Body Heat Sources under Natural Convection

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        Author
        Zhang, Zujing
        Day, Rodney
        Wang, Kequan
        Wu, Hongwei
        Yuan, Yanping
        Attention
        2299/20669
        Abstract
        In this article, a combined experimental and numerical study has been performed to investigate the thermal performance of a mine refuge chamber (MRC) under natural convection. In the current study, a 20-hour heating experiment is carried out in a fifty-person MRC laboratory and the heat lamps are utilized to simulate the human heat loss. A new analytical model is proposed to predict the air temperature and validated against the experimental data. Sensitivity analysis is performed to further investigate the effects of the thermal parameters of the rock. Results indicated that: (1) two different air temperature increase stages, rapid and slow increase stages, are observed in the MRC; (2) A new analytical method for predicting the air temperature in MRC under natural convection is proposed, it shows that the air temperature increasing trend becomes slow with the increase of the thermal conductivity, density and specific heat capacity of the rock; (3) the surface heat transfer coefficient on the vertical walls reaches the largest and it increases linearly with air temperature.
        Publication date
        2018-12-25
        Published in
        Applied Thermal Engineering
        Published version
        https://doi.org/10.1016/j.applthermaleng.2018.09.068
        Other links
        http://hdl.handle.net/2299/20669
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