1. Thermal performance analysis of an underground closed chamber with human body heat sources under natural convection
- Author
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Rodney Day, Yanping Yuan, Kequan Wang, Zujing Zhang, and Hongwei Wu
- Subjects
Natural convection ,Materials science ,020209 energy ,Infrared lamp ,Energy Engineering and Power Technology ,02 engineering and technology ,Mechanics ,Closed chamber ,Heat capacity ,Industrial and Manufacturing Engineering ,Thermal conductivity ,020401 chemical engineering ,Thermal ,0202 electrical engineering, electronic engineering, information engineering ,Sensitivity (control systems) ,0204 chemical engineering ,Current (fluid) - 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.
- Published
- 2018