Abstract: The application of a new type of local cooling machine in high temperature working face was introduced， that emphasizes on description of a new type of local cooling machine which is more suitable for underground local working face， and the thermal calculation of the local cooling machine was carried out to find out the cooling load of the refrigeration unit and its related performance parameters. Experiments show that this cooling machine can be better used in local working face. Being different from the previous cooling equipment used in local environment， liquid CO₂ is used as cooling medium to form a circulating system in the cooling machine， which modifies the structure of heat exchanger， improves the cooling effect and saves the costs as much as possible. The new type of local cooling machine aims to solve the high temperature problem at local high temperature working face， so as to apply it in the mines with high temperature environment.

Key words: High-temperature mine, Local cooling machine, Thermal calculation, Liquid carbon dioxide, Recycling