Invention Patents [1] Hongqiang Li, Shushuo Kang, Bo Cai, Shan Hu, Peina Huo, Jie Han, Jin Zhou, Guoqiang Zhang, natural gas distributed energy system with ground source heat pump coupling of composite power system, ZL201210142139.0, IPC F25B 29/00201031 1 [2] Wei Yin, Guoqiang Zhang, Shenghua Zou, Xiaoli Hao, vacuum…
