At present, the double screw compressor parallel unit has been widely used in Dun 'an full liquid water-cooled screw unit. The unit has 3 patents of parallel technology such as dynamic intelligent oil balance control technology, which ensures the oil return stability and oil level balance of the unit.
Due to the constraints of materials, processing level, cost and other factors, it is difficult to improve the full load performance of the air conditioning unit, and the partial load performance of the unit can often be improved by system optimization to achieve low difficulty and good economy. Parallel operation of compressors is an effective means to improve the performance of some units. For refrigeration units with large cooling capacity, a single large cooling capacity compressor can be used, or two smaller compressors can be used, and the two compressors can be divided into two independent systems or two compressors in parallel. The unit with a single large cooling capacity compressor will have a significant decrease in motor efficiency during unloading, and the unit with a dual compressor independent system will not participate in heat transfer when one compressor is unloaded, nearly half of the heat exchange area of the evaporator and condenser can not participate in heat transfer. When a unit with two compressors is unloaded, the efficiency of the compressor will not be reduced, and the heat exchange area of the heat exchanger will not be reduced, so the partial load performance of the refrigeration unit with a parallel compressor is relatively highest.
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