Air-conditioning system and control method thereof

Abstract

The invention discloses an air-conditioning system and a control method thereof. The air-conditioning system comprises a compressor, a four-way valve, an evaporator, a condenser and a first throttlingdevice. The compressor, the condenser, the first throttling device and the evaporator form a first loop through the four-way valve; the compressor, a defrosting heat exchanger, a second throttling device and an auxiliary heat exchanger form a second loop through a fluid control valve; and the defrosting heat exchanger can transmit own heat to the condenser in a heat conduction mode, and defrosting of the condenser is achieved. A relatively independent defrosting system is adopted, an existing machine only needs to be changed slightly, the frosting probability of the condenser can be lowered,defrosting can be achieved even though frosting occurs, and thus an indoor unit can perform continuous heating and does not stop.

Description

technical field [0001] The present invention relates to an air conditioning system and its control method, in particular to an air conditioning system and its defrosting control method. Background technique [0002] In the prior art, when the air-conditioning system, especially the heat pump air-conditioning system, is heating, frosting is prone to occur. When the air-conditioning system is defrosting, a four-way valve, that is, a four-way reversing valve, is used to achieve defrosting. At this time, the air conditioning system needs to stop heating and run cooling, which will lead to poor user experience. [0003] To sum up, it is necessary to propose an air conditioning system capable of continuous heating and its control method. In the patent document whose publication number is CN108131858A, defrosting is realized by setting two evaporators in the indoor unit. When defrosting, one evaporator participates in defrosting, and the other normally heats up. Considering the d...

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Problems solved by technology

Considering the design of indoor unit, air duct, evaporator and selection of fans, this solution is difficult to implement and has high cost; the patent document with publication number CN106524399A is to set multiple condensers and use bypass valves to make the required condensation When defrosting the evaporator, other condensers act as evaporators to defrost, which is consistent with the principle of the previous patent document. An additional heat exchanger is set instead of the evaporator to participate in defrosting. This solution also has the problems of difficulty in implementation and high cost

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