Studies of a Heat Pump Using Water and Air Heat Sources in a Series. Performance in Cooling Operation.

The cooling performance of the heat pump system in which an air-cooled and a water cooled condensers were arranged in a series was studied experimentally and analytically. The capacity of the compressor was 250 W and R22 was used as the refrigerant. In the analysis, the coefficient of performance (COP), the cooling power, the heat absorbed by the air and the heat absorbed by the water at the condensers were predicted using the data of the heat pump with the air-cooled condenser and the heat pump with the water-cooled condenser. The COP was able to be increased by using the air-heat source in addition to the water heat-source. Also, the thermal load of the water heat-source became half by adding the air heat-source in the system when the temperature of the water was 5°C higher than that of the air.