Thermodynamics Performance Study on Air Source Heat Pump in Variant Operating Condition

A certain product of the air source heat pump is selected as the study object in the paper. By variant condition operating performance of such air source heat pump in variant condition of the air source heat pump offered by manufacturer, the thermodynamics analyses are made based on the first law of thermodynamics and exergy analyze theory. Coefficient of Performance (COP) and exergy efficiency in variant operating condition are calculated, and then the curves for the relationship of COP and exergy efficiency with the outlet temperature of the chilling water/heating water and the environment temperature are plotted. The COP functions concerning with the outlet temperature of the chilling water/heating water and the environment temperature are fitted. Conclusions on variant condition and operation of the air source heat pump are drawn by comparing these two theories. Finally, it indicates that the best operating condition should be set considering COP, exergy analysis and practical requirement for cold and thermal.