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

Zujing Zhang, Rodney Day, Kequan Wang, Hongwei Wu, Yanping Yuan

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
51 Downloads (Pure)

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.
Original languageEnglish
Article number145
Pages (from-to)453-463
Number of pages11
JournalApplied Thermal Engineering
Volume145
Early online date15 Sept 2018
DOIs
Publication statusPublished - 25 Dec 2018

Keywords

  • Heating
  • Mine refuge chamber
  • Natural convection
  • Surrounding rock
  • Temperature
  • Thermal performance

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