Method for determining defrosting of air source heat pump unit

Abstract

The invention discloses a method for determining defrosting of an air source heat pump unit. The method comprises the following steps of acquiring the ambient temperature, ambient humidity, and fin temperature by a sensor detection module of the heat pump unit; judging that the ambient humidity is greater than or equal to the predetermined defrosting humidity, determining the first defrosting timeby checking a relationship table of the ambient temperature and the ambient humidity, and acquiring the compressor running time; and judging that the compressor running time is greater than the firstdefrosting time, judging that the fin temperature is smaller than or equal to the preset defrosting chip temperature, judging that the ambient temperature is smaller than or equal to the preset defrosting ambient temperature, judging that the difference between the ambient temperature and the fin temperature is less than or equal to a preset defrosting ring fin difference, and entering a defrostprocedure. According to the method for determining the defrosting of the air source heat pump unit provided by the invention, by acquiring the ambient humidity, judging the ambient temperature, the problem that the that the energy efficiency of the unit is reduced caused by defrosting or excessive frosting of the unit due to the phenomenon that the ambient humidity is too low and the unit enters defrosting without frosts, and the phenomenon that the ambient humidity is too high and the unit does not enter defrosting when the frosting is serious is solved.

Description

technical field [0001] The invention relates to the technical field of throttling components in refrigeration, air conditioning and heat pump industries, and in particular to a method for judging defrosting of an air source heat pump unit. Background technique [0002] For a heat pump or air-conditioning system, when heating in winter, it usually defrosts at regular intervals or by a combination of ambient temperature, coil temperature, and the difference between ambient temperature and coil temperature. In foggy weather, the relative humidity is too high, As a result, the frosting speed of the fins is accelerated. For the traditional defrosting method, the unit will not start defrosting before the defrosting time is reached. At this time, the heating capacity of the unit is already very low, and the user experience is extremely poor. [0003] At present, the air source heat pump units on the market basically judge the defrosting conditions based on the ambient temperature, ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for judging the defrosting of an air source heat pump unit, which solves the phenomenon that the heat pump unit enters defrosting even when there is no frost or does not enter defrosting when the frosting is serious

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