The exhausted air heat extraction project of Xinwang Coal Mine in Datong, Shanxi Province is located in Datong, Shanxi Province. The project is equipped with two two-stage heating medium-temperature exhaust air heat pump units, namely KLMK-STS/S-1000/250 and KLMK-STS/S-800/200, with water supply temperature ≥ 50 ℃, which have been running smoothly for two heating seasons, and are used for fresh air heating and bathing hot water at the wellhead, with good heating effect.The project was completed and officially put into use in January 2020.