Compare the Calculations of Steam Extraction Efficiency of Power Plant Turbine by Simple Heat Balance Method and Equivalent Enthalpy Drop MethodYuanyuan Li, Tongrui Cheng, Zhenning Zhao and Liangcai XuE3S Web Conf., 204 (2020) 02011DOI: https://doi.org/10.1051/e3sconf/202020402011