Evaporative condenser uses water to absorb heat energy during evaporation and exchange heat with refrigerant, so that the refrigerant in the tube is cooled and condensed, and the flow rate of water and air is small. Its main influence factor is the dry and wet bulb temperature of the inlet and outlet. And it has a very strict standard, its operating cost is more expensive than the other two condensers, and is not suitable for use in air source heat pump units [8]. The choice of condenser is also affected by many factors.