System and method for preventing air source heat pump water heater from frosting by using solid dehumidification

Abstract

The invention provides a system and method for preventing an air source heat pump water heater from frosting by using solid dehumidification. In the method, a heat exchanger with a solid drying agent coating is used for preprocessing water in moist air, and therefore the water in the moist air is prevented from frosting on the surface of an evaporator. According to the system and method, the air of an inlet of the evaporator is dehumidified by means of the solid drying agent coating, so that the frosting problem of the heat pump water heater is resolved, and heating performance of the heat pump water heater is enhanced. When the water absorbed by solid adsorbing agents reaches a limitation, water in the solid adsorbing agents is desorbed by means of heat released by condensation of heat pump work media, at this time, circulation air with desorbed high-temperature moisture has heat exchange and congeals on the surface of the evaporator, the evaporator recycles the heat released in a condenser, and regeneration efficiency of a heat pump is improved.

Description

technical field [0001] The invention uses the solution to dehumidify the air in the circuit of the heat pump water heater, improves the heat exchange performance of the outdoor evaporator of the heat pump water heater, improves the heating performance of the heat pump water heater system, belongs to the field of improving the performance of the air source heat pump water heater, and relates to the field of home appliance manufacturing , in particular, incorporates a method of frost prevention. Background technique [0002] At present, among the water heaters used by Chinese residents, electric water heaters, gas water heaters and solar water heaters occupy a large proportion. The air source heat pump water heater can transfer the heat of the low-temperature heat source to the domestic hot water we need by consuming part of the electric energy. Because of its advantages of high efficiency and energy saving, it has become the fourth type of new water heater form. However, it ...

AI Technical Summary

Problems solved by technology

The former is to directly bypass part of the high-pressure gas discharged from the compressor to the evaporator for defrosting. At this time, since the heat of the refrigerant on the high-pressure side still comes from the heat absorbed by the evaporator, when the temperature is low and the defrosting is not fast enough, there is no Sufficient heat absorption will cause the system to fall into a protective shutdown state; the latter is a reverse cycle defrosting through the four-way reversing valve. At this time, not only cannot produce hot water, but also cause the energy of the original hot water to be lost

It can be seen from the above that some existing conventional defrosting methods have their own disadvantages

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