Air Source Heat Pump working principle

Take refrigerant as the medium, the refrigerant can be vaporized at -40℃low temperature. Therefore, there is temperature difference with outside air. refrigerant absorbs the temperature from outside air, compressed by compressor heating, turn into the high temperature high-pressure gas, exchange heat via the heat exchanger with water, to release pressure via the expansion valve , back to the low-temperature low-pressure liquefied state, through a continuous cycle of refrigerant.