23 September 2011

EXPERIMENTAL INVESTIGATION ON THE PERFORMANCE OF A MODERATE-TEMPERATURE AIR-SOURCE HEAT PUMP WITH LARGE TEMPERATURE-DIFFERENCE ACROSS CONDENSER


This work experimentally investigates the impact of several operating parameters
on the heating performance of a moderate-temperature air-source heat pump water heater.
The operating parameters considered in the study are the air inlet temperature, hot water inlet
temperature, flow rate of hot water, while the heating performance studied herein include the
heating capacity of the condenser, power consumption of the compressor, and COP of the
heat pump. The effect of temperature lift of heat pump on COP is also discussed. The results
show that the temperature lift of heat pump could be served as an indicator for the
assessment of COP. The COP will decrease by 13.5% for each 10K increment of temperature
lift for the moderate-temperature air-source heat pump. The COP is 2.2, when the
temperature lift of the heat pump is 61.3°C and the outlet temperature of hot water is 81.5°C.