Air-conditioning system and control method thereof

Abstract

The invention provides an air-conditioning system and a control method thereof. The air-conditioning system comprises a refrigerant circulating loop and a controller, wherein the refrigerant circulating loop is mainly formed by connecting a compressor, a reversing valve, an indoor heat exchanger, an outdoor heat exchanger and an electronic expansion valve through a refrigerant pipeline; and the controller is used for controlling the air-conditioning system to operate. By virtue of the air-conditioning system provided by the invention, a refrigerant heater is additionally arranged between the outdoor heat exchanger and the electronic expansion valve of a throttling device; the refrigerant heater is controlled to be started, and the frequency of the compressor and the openness of the electronic expansion valve are correspondingly controlled according to actual working conditions, so that under the condition of non-reversing of the reversing valve in a heating mode, a frost layer on the outdoor heat exchanger can be molten; and meanwhile, the indoor heat exchanger continuously supplies heat to a room, the comfort of the air-conditioned room is ensured, and the air-conditioner using experience of a user under the low-temperature working condition is improved. The air-conditioning system is simple in structure, easy to control, reliable to operate and easy to implement. Compared with like products, the air-conditioning system has higher competitive advantages.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and more specifically relates to an air conditioning system capable of defrosting without reversing during heating operation and a control method thereof. Background technique [0002] When an air conditioner with a heat pump system (hereinafter referred to as an air conditioner) is used under low temperature conditions, after running for a period of time, the outdoor heat exchanger will frost, which increases the thermal resistance and wind resistance, and the heat transfer effect becomes poor, thus making the room Inner comfort deteriorates. In order to make the air conditioner work normally, it is often necessary to remove the frost from the external unit. [0003] The main defrosting method of the existing air conditioner is the reversing of the four-way valve, and the frost layer on the outdoor heat exchanger is removed through the refrigeration cycle. Although such a defrosting m...

AI Technical Summary

Problems solved by technology

Although such a defrosting method can remove the frost on the heat exchanger, but in the process of defrosting, the indoor fan stops running, and the indoor heat exchanger absorbs heat from the room, which cannot continuously heat the room and reduces the temperature of the room. Temperature comfort, user experience will be worse

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