What is the effect of using a secondary Compressed air heat pump water heater set?

A second stage Compressed air water heater set includes a first condenser, a first throttling element, a first evaporator, and a first frequency conversion compressor sequentially connected by a refrigerant piping to form a primary heating loop, and a second condenser, a second flow element, a second evaporator and a second frequency conversion compressor sequentially connected by a hot water distribution pipe to form a secondary heating loop, the second evaporator is located in a position capable of absorbing heat emitted after liquefaction of a high-pressure refrigerant in the first condenser. The utility model has the effect that the primary heating circuit is added, the temperature of the working medium in the secondary heating circuit is ensured, thus the serious problem of frosting is solved, and the thermal efficiency is ensured.