Research and practice of water source heat pump technology in Heyi station Shiyao He, Yongxiang Ren, Kai Jiao, Jun Deng, Yiming Meng, Le Liu, Jinshuai Li and Renjie Li E3S Web Conf., 218 (2020) 01004 Published online: 11 December 2020 DOI: 10.1051/e3sconf/202021801004