在无任何外界支持的情况下，矿井避难硐室应满足96小时额定防护时间内温度不高于35℃的强制要求。常规的制冷降温措施均存在一定的局限性，不能满足煤矿井下紧急避险系统建设的要求，相变降温是目前最具潜力的技术措施。避难硐室相变降温目前处于工程尝试阶段，尚缺系统的理论研究。课题拟采用理论分析、数值计算与实验研究相结合的方法，进行矿井避难硐室相变降温的基础研究。具体包括：避难硐室高温环境形成过程的三维非稳态传热数值模拟与实验验证；围岩的间歇蓄冷机理及其对避难硐室热环境的影响；复杂边界下内部非均质复合材料相变单元的传热特性分析，并在此基础上研究相变装置的蓄热特性；避难硐室围岩-人体-相变装置-室内空气的三维非稳态传热数值模拟与实验研究；相变降温装置与蓄冷围岩的优化配置。研究成果可为解决矿井避难硐室降温技术难题，实现易维护、低成本、无危害的有效降温提供理论基础和技术支撑。

The mine refuge chamber should be cooled in order to reach the standard of temperature in 96 hours without any outside support. At present, phase-change cooling is the best way to control the temperature of coal mine refuge chamber, while the conventional measures of refrigeration cooling can not meet the thermal environment requirements of mine refuge chamber. In this work, the basic research of phase-change cooling in mine refuge chamber will be studied by using the comprehensive method of theoretical analysis, numerical calculation and experimental research. The main work is divided into the following parts: 1) three-dimensional numerical simulation and experimental validation of the unsteady heat transfer process in 96 hours; 2) the main influencing factors of the thermal environment refuge chamber will be analyzed, the impacts especially the initial temperature and the heat transfer of the wall rock on the thermal environment; 3) the heat storage characteristic of phase change unit filled with heterogeneous materials in the complex boundary, especially the phase-change device which including expanded graphite composite phase change material / metal mesh; 4) the numerical calculation and experimental research of the three-dimensional unsteady heat transfer under the wall rock-human body-phase-change device-indoor air environment coupling, and the optimization of phase-change cooling device. The research result will solve the cooling technical problems of the mine refuge chamber, and provide theory and technology for maintenance-free, low-cost, non-hazardous cooling in mine refuge chamber.