VRV (Varied Refrigerant Volume) air conditioning system and VRV air conditioning defrosting control method

Abstract

The invention provides a VRV (Varied Refrigerant Volume) air conditioning system. The VRV air conditioning system comprises a heat accumulator working pipeline respectively communicated with a VRV liquid refrigerant pipeline and a VRV gaseous refrigerant pipeline; a heat accumulator, a heat accumulator electronic expansion valve and a heat accumulator electromagnetic valve are arranged on the heat accumulator working pipeline. A first four-way valve is arranged among the gaseous refrigerant pipeline, an air suction port and an exhaust port of a compressor and a communicating pipe, a second four-way valve is arranged between an outdoor unit heat exchanger and the communicating pipe, and meanwhile a first defrosting pipeline and a second defrosting pipeline are respectively arranged between the second four-way valve and the heat accumulator working pipeline and between the second four-way valve and the gaseous refrigerant pipeline. When frosting of the system needs defrosting, the heat for defrosting is supplied by an indoor unit and the heat accumulator together so as to reduce the influence of defrosting process on the indoor side, so that the defrosting time is shortened, and the heating effect of the indoor side is guaranteed. The invention further provides a VRV air conditioning defrosting control method.

Description

technical field [0001] The invention relates to the technical field of air conditioning, and more specifically, to a multi-connected air conditioning system and a defrosting control method thereof. Background technique [0002] At present, heat accumulators have been widely used in domestic air conditioners and laboratory researches with the function of defrosting treatment of air conditioners. [0003] Multi-connected central air conditioner is a type of household central air conditioner, which refers to the fact that one outdoor unit heat exchanger is connected to two or more indoor units through piping. In the multi-connected defrosting method, due to the partial load At the same time, the multi-line system has complete control means, various reversing valves, solenoid valves, etc., so that the multi-line system is used in a variety of situations. Under various operating loads and different frosting conditions, more requirements are required. The multi-connected units me...

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Problems solved by technology

[0003] Multi-connected central air conditioner is a type of household central air conditioner, which refers to the fact that one outdoor unit heat exchanger is connected to two or more indoor units through piping. In the multi-connected defrosting method, due to the partial load At the same time, the multi-line system has complete control means, various reversing valv...

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