Heat pump air-conditioning unit defrosting control method and system

Abstract

The invention provides a heat pump air conditioning unit defrosting control method and system. The method comprises the steps that the operation working condition of a heat pump air conditioning unit is detected; if it is detected that two or more heating pipeline systems which operate for heating exist and defrosting pipeline systems meeting the defrosting conditions exist in the heating pipeline systems, the defrosting capacity of the defrosting pipeline systems and the heating capacity of the heating pipeline systems except the defrosting pipeline systems are obtained; whether the defrosting capacity is smaller than the heating capacity is judged; if yes, the defrosting pipeline systems are controlled to turn on the defrosting mode; and if not, the defrosting pipeline systems with the defrosting mode being turned on are selected again according to the frosting degree. According to the heat pump air conditioning unit defrosting control method and system, the effect that heat absorbed during defrosting is lower than the heating amount at the same time can be ensured, the temperature of water in an indoor side water tank is not decreased, the effect that the defrosting water tank temperature is constant in winter is achieved, the water using experience of a user is improved, and the product comfort is improved.

Description

technical field [0001] The invention relates to the technical field of defrosting, in particular to a defrosting control method and system for a heat pump air-conditioning unit. Background technique [0002] When the heat pump air conditioner is running for heating in winter, the heat exchanger of the outdoor unit will frost and affect the heating operation. In order to ensure the normal operation of the heat pump air conditioner, it is necessary to defrost the heat pump air conditioner. The defrosting method generally uses a four-way valve to guide the refrigerant to change direction so as to achieve the purpose of defrosting. In this way, it is necessary to continuously absorb the heat of the hot water in the water tank on the side of the indoor heat exchanger during the defrosting process, which often causes the water tank change in temperature. Heat pump air conditioning units usually include multiple piping systems, such as figure 1 As shown, when the heat pump air co...

AI Technical Summary

Problems solved by technology

[0003] In view of this, it is necessary to provide a defrosting control method and system for heat pump air-conditioning units that can prevent the temperature of the defrosting water tank from dropping in winter to solve the problem of large temperature fluctuations in the traditional defrosting process.

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