In some special circumstances such as building envelope, Traditional cooling methods can not meet the requirements of safety, stability, reliability and energy saving. In Part I of this study, a new conjugate cooling method of Phase Change Material (PCM) combined with Pre-cooling of Building Envelope (PBE) is proposed and the numerical model of PBE are developed. In the current study, a refuge chamber is selected as a case study. A semi-analytical method is used to analyze the cold storage performance of the surrounding rock (SR). Afterwards, a numerical simulation model of the coupling cooling system, which take the heat source, SR, PCM and air heat transfer into consideration, is further established. The study identified that the simplified semi-analytical calculation formula with the diagram of the cold storage quantity of SR are very helpful for engineering calculation. The influence of the Fourier and Biot number on the cold storage capacity of SR can be easily analyzed. In addition, the whole-field model of the conjugate cooling system is completely developed based on the PCM unit. Part II will involve a parametric assessment and the optimization of the conjugate colling method will be explored.

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