Many air source heat pumps use the reverse-cycle defrost to remove frost that varieties on the outside heat exchanger during normal winter operation. While defrosting restores heat pump effectivity, this interval of operation itself requires further energy and finally leads to an power penalty. Furthermore, test results showed that the improved frost system with the compensator labored as expected, and its suction and discharge pressures and the ability of the compressor through the defrosting had been much bigger than before. However, it is tough to …