Defrosting system and method for air source heat pump

Abstract

The invention relates to a defrosting system and method for an air source heat pump. According to the technical scheme, the defrosting system comprises an anti-freezing water tank, a defrosting tube 1, a defrosting tube 2 and a water pan, wherein an electrical heater is arranged in the anti-freezing water tank; the water pan is arranged at the lower part of an evaporator; the defrosting tube 1 and the defrosting tube 2 are mounted on the evaporator; an anti-freezing solution in the anti-freezing water tank is connected to the defrosting tube 1 in the evaporator through an anti-freezing water pump and a pipeline and connected to the water pan through the defrosting tube 2; an ice melting tube is arranged in the water pan, and an outlet of the ice melting tube is connected with the anti-freezing water tank, so that circulation of the anti-freezing solution is realized. The defrosting system and method have the benefits as follows: the water pan is separated from a supporting plate of the evaporator and fixed below the evaporator at a certain interval, the situation that defrosted water freezes in the water pan and accumulated upwards along the bottom of the evaporator is avoided, the ice melting tube is arranged in the water pan, and accordingly, condensate water can be prevented from freezing in the water pan.

Description

technical field [0001] The invention relates to an air source heat pump, in particular to an air source heat pump defrosting system and method. Background technique [0002] At present, the defrosting of the air source heat pump unit mostly uses refrigerant reversing defrosting. When the evaporator is frosted, the heating capacity of the heat pump unit is reduced. When the evaporator is frosted to a certain extent, the four-way reversing valve is switched to the cooling condition. Run to heat the evaporator to achieve the purpose of defrosting. When the ambient temperature is low and the air humidity is high, the evaporator is severely frosted, and the heat pump unit defrosts frequently, which has a certain impact on the heating work. It has been frozen, and when the ice layer accumulates to a certain thickness, it will extend upward along the bottom of the evaporator, which will have an adverse effect on the unit. Contents of the invention [0003] The purpose of the pr...

AI Technical Summary

Problems solved by technology

When the ambient temperature is low and the air humidity is high, the evaporator is severely frosted, and the heat pump unit defrosts frequently, which has a certain impact on the heating work. Frozen, when the ice layer accumulates to a certain thickness, it will extend upward along the bottom of the evaporator, which will have a negative impact on the unit

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