A multi-connected air-conditioning system and its control method

Abstract

The invention provides a variable refrigerant volume air conditioning system. The variable refrigerant volume air conditioning system comprises a compressor (1), an outdoor heat exchanger (2), an indoor heat exchanger (3), a four-way valve (4), an air distributor (5), a supercooler (6) and a supercooling expansion valve (15), wherein a first branch pipeline (7) and a second branch pipeline (8) are arranged between a low-pressure pipeline and a high-pressure pipeline of the supercooler (6) in a manner of being connected in parallel, the first branch pipeline (7) is arranged in a manner of penetrating through the inner part of the air distributor (5), and a heat exchanger (9) is arranged in the air distributor (5). The variable refrigerant volume air conditioning system further comprises a control device used for controlling the connection of one of the first branch pipeline (7) and the second branch pipeline (8) and the disconnection of the other one. Through the variable refrigerant volume air conditioning system provided by the invention, the technical problem that the heat exchange effect is poor under the condition that the outdoor environment temperature is low can be solved. The heating efficiency of the system particularly in a low-temperature environment is effectively increased, the heat exchange effect is enhanced, and the energy utilizing rate is increased. The invention further relates to a control method of the variable refrigerant volume air conditioning system.

Description

technical field [0001] The invention belongs to the technical field of air conditioning and heat pump systems, and in particular relates to a multi-connected air conditioning system and a control method thereof. Background technique [0002] At present, the vast majority of domestic on-line external unit products generally use ordinary frequency conversion high-pressure cavity scroll compressors, that is, non-enthalpy-increasing scroll frequency conversion compressors, which have "same frequency, high capacity" compared with enthalpy injection frequency conversion scroll compressors. Low, same capacity, low energy efficiency, high high frequency exhaust temperature, low heating capacity under low temperature conditions” disadvantages. [0003] At the same time, the country has clearly put forward the requirement of "energy saving and emission reduction", which has been legalized and institutionalized, and the national related multi-line energy efficiency standards are improv...

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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low energy utilization rate and unsatisfactory heat exchange effect in the multi-connected air-conditioning system in the prior art, especially in a low-temperature environment, so as to provide a multi-connected air-conditioning system and its Control Method

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