Experimental research for improving performance of air-source heat pumps in low ambient temperature

Viewing the performance decrease of air-source heat pumps in low ambient temperature, reforms the prototype machine by adding the two parts of auxiliary capillary and heat exchanger. Compares by testing the heat output, energy efficiency ratio and suction/discharge pressure with those of the prototype machine. The results show that the performance of air-source heat pump in low ambient temperature is improved to some extent.