Investigation on temperature control performance of an underground confined space under ventilation

• Published in: Thermal science and engineering progress Vol. 50; p. 102591
• Main Authors: Jin, Ting, Zhang, Zujing, Ge, Liang, Liang, Xing, Wu, Hongwei, Zhou, Jiri, Mao, Ruiyong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2024
• Subjects: Confined space; Mine refuge chamber; Surrounding rock; Thermal control; Ventilation; VV; Thermal control; Mine refuge chamber; Ventilation; IT; Surrounding rock; ISRT; VT; Confined space; MRC; HSI; SR
• ISSN: 2451-9049
• DOI: 10.1016/j.tsep.2024.102591

•Air inlets are best 1.5 m from ground and perpendicular to side-wall for thermal comfort.•Heat transfer of surrounding rock in arched mine refuge chambers (MRCs) is close to circular.•Ventilation with 450 m3/h and 20 °C satisfy 30 occupants for MRCs with an ISRT of 32 °C. The control of thermal environment in underground structures has always been a subject of great concern. In this paper, the influence of initial surrounding rock temperature (ISRT), ventilation temperature (VT) and ventilation volume (VV), as well as internal heat source intensity (HSI) on the temperature control of ventilation risk in underground closed space is explored by building a 50-person Mine refuge chamber (MRC) model with internal heat source. The model is verified according to the experimental data, and the relative deviation is less than 4.3 %. The simulation results show that the indoor temperature (IT) is proportional to the ISRT, HSI and VT, but inversely proportional to the VV. When there are 30 people in the MRC, the ISRT and the initial IT are 32 °C, the VT is 20 °C, and the VV should exceed 450 m3/h to meet the temperature control requirements of 96 h. Taking into account the comfort of personnel, it is recommended that the air volume of 900 m3/h is more appropriate for 30 people.