Abstract
The off-design experimental performances of heat pump system using HFC125/HF290 (25/75, mass fraction) binary blends are investigated by varying the mass flowrate of heat sink. The influences of heat sink flowrate upon system coefficient of performance (COP), discharge temperature, exergy efficiency, volumetric heating capacity, mean heat transfer coefficient and temperature profile in condenser are analyzed. The results show that the compressor power and compression ratio is increased with the mass flowrate of heat sink while the volumetric and specific mass heating capacity is increased firstly and then decreased. Meanwhile, the discharge temperature is decreased and the mean heat transfer coefficient is increased when the mass flowrate of heat sink is raised. For second heat transfer fluid temperature difference in condenser, it is gradually dropped at the inlet of the condenser and increased in the middle of the condenser and at the outlet of the condenser. Under the condition of heat sink outlet temperature of 35 °C, the heat transfer pinch point is transferred into the inlet of the condenser. The results in this research can be a useful guideline for the application of heat pump system using such kinds of refrigerant blends.
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