Central air conditioning system and control method thereof

Abstract

The invention provides a central air conditioning system and a control method thereof. The central air conditioning system comprises an air conditioning unit, a cooler and a heat dissipation part, andfurther comprises a circulating pipeline, wherein the air conditioning unit comprises a condenser and an evaporator; the cooler is in circulating connection to the condenser; the heat dissipation part is in circulating connection to the evaporator; one end of the circulating pipeline communicates with the condenser, and is output to a first pipeline of the cooler, and the other end of the circulating pipeline communicates with the evaporator and is output to a second pipeline of the heat dissipation part. The circulating pipeline is arranged between the first pipeline and the second pipeline,so that low-temperature fluid on the second pipeline can be guided into the first pipeline, and thus, the temperature of the fluid on the first pipeline is reduced, and thus, the purpose of reducingcondensation pressure and a compression ratio is achieved.

Description

technical field [0001] The application belongs to the technical field of central air-conditioning systems, and in particular relates to a central air-conditioning system and a control method thereof. Background technique [0002] Magnetic levitation technology has been successfully applied in the refrigeration industry. Compared with ordinary centrifugal water-cooled units, magnetic levitation centrifugal water-cooled units have the advantages of high energy efficiency, long life, low energy consumption, low noise, and environmental protection. The magnetic levitation air conditioning system is mainly composed of evaporator, condenser, magnetic levitation centrifugal compressor, throttling device, cooling tower, water system and so on. [0003] During the normal operation of the unit, there are situations where the user load is too large or the cooling capacity of the cooling tower is insufficient. At this time, the condensing pressure of the unit rises rapidly in a short pe...

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Problems solved by technology

[0003] During the normal operation of the unit, there are situations where the user load is too large or the cooling capacity of the cooling tower is insufficient. At this time, the condensing pressure of the unit rises rapidly in a short period of time, which will increase the loss of the compressor and reduce the cooling capacity of the unit, which will seriously affect the operation of the unit. At the same time, it brings a large heat dissipation burden to the cooling tower; on the other hand, it is also common for the unit to operate at a low load. When the load is low, the unit operates at a low frequency. Near the surge frequency, the compression ratio ( Condensing pressure / evaporating pressure) is too high, it is easy to cause compressor surge due to the mismatch between operating frequency and compression ratio, seriously affecting the normal operation of the unit, and causing serious damage to the compressor and piping system

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