Abstract: To select high temperature heat pump working fluids, which are expected to be environmentally friendly and suitable to work at condensing temperatures ranging from 80 to 110 ℃, theoretical and experimental researches on heat pump cycle performance of a non-azeotropic mixture M with zero ozone deplete potential (ODP) are carried out. The theoretical performance analysis results show that both specific volumetric heating capacity (qv) and coefficient of performance (COP) of M are superior to those of traditional working fluid CFC114. The experimental results show that the heating capacity Q and the COP of M system will improve along with the rise of working temperature. In the experiments, the highest average condensing temperature of M reaches 104.5 ℃, the corresponding heat output temperature attains 103.0 ℃, the condensing pressure and discharge temperature are 1.951 MPa and 120.8 ℃ respectively, and they are all within the limit range for safe application.

Key words: High temperature heat pump, Theoretical and experimental cycle performance, Working fluid