Method and device for restraining low-temperature running frosting of air source heat pump water heater

Abstract

The invention relates to a method and device for restraining low-temperature running frosting of an air source heat pump water heater, and belongs to the technical field of heating and heat supplying. An auxiliary heat source system, a water mixing device and a water mixing control subsystem are arranged outside the air source heat pump water heater. Defrosting of the surface of an evaporator is achieved by increasing the water supply temperature of a condenser before water supply of the condenser. The device comprises the air source heat pump water heater IV, the water mixing control subsystem I, the water mixing device II and the auxiliary heat source system III. The water mixing control subsystem I is connected with the water mixing device II and the auxiliary heat source system III through a sensor. The water mixing device II is connected with the auxiliary heat source system III. The water mixing device II is connected with the air source heat pump water heater IV. According to the method and device, system stability is improved, meanwhile, the defrosting time is effectively shortened, and the method and device have the beneficial effects of being capable of saving energy, environment-friendly, economical and the like.

Description

technical field [0001] The invention relates to a method and a device for suppressing frosting of an air source heat pump water heater operating at low temperature, belonging to the technical field of heating and heating. Background technique [0002] The air source heat pump is an economical and environmentally friendly device. Under low temperature conditions, the inlet water temperature of the condenser will drop, the outlet temperature of the refrigerant will also drop, and the suction pressure and temperature of the compressor will also drop accordingly. However, the suction and discharge pressure of the compressor have a certain range. When the evaporation pressure of the system is lower than the lower pressure limit of the compressor, the system will not work normally. When the suction pressure decreases, the suction specific heat capacity of the refrigerant increases, the mass flow rate of the system decreases, and the heating capacity is significantly attenuated. ...

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Problems solved by technology

Although this method is widely used, the suction and discharge pressure changes drastically, and the impact on the compressor is too great, resulting in a large heating loss.

Some people have also proposed the defrosting method of hot gas bypass, that is, adding a bypass pipe between the inlet of the evaporator and the outlet of the compressor. Although this method has an obvious effect on inhibiting frosting, when defrosting, the hot gas with high temperature and high pressure exchanges heat outdoors. The compressor will turn into liquid after heat release and defrosting, causing the compressor to suck liquid

Some people also proposed to increase the electric field, magnetic field, ultrasonic wave and mechanical vibration around the heat exchanger of the outdoor unit to achieve the result of inhibiting frosting, but these measures are far from being put into practice.

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