Evaporative cooling type water chilling unit heat exchanging system and control method thereof

Abstract

The invention discloses an evaporative cooling type water chilling unit heat exchanging system and a control method thereof, and belongs to the technical field of air conditioners. The evaporative cooling type water chilling unit heat exchanging system comprises a magnetic levitation centrifugal compressor, an evaporative condenser, a drying filtering device, an economizer, a falling-film evaporator and a control system. An air outlet of the magnetic levitation centrifugal compressor communicates with an inlet of the evaporative condenser through a pipeline. An outlet of the evaporative condenser communicates with an inlet of the drying filtering device through a pipeline, and communicates with a cooling inlet of the magnetic levitation centrifugal compressor through a pipeline. The falling-film evaporator communicates with an inlet of the magnetic levitation centrifugal compressor through a pipeline. The air outlet of the magnetic levitation centrifugal compressor communicates with the falling-film evaporator through a pipeline. A bypass solenoid valve is connected with the pipeline in series. Through control of the bypass solenoid valve, normal starting of a compressor with a low-pressure ratio is achieved, the compressor is protected from damage, the compressor with a low-pressure ratio is adopted, and the energy efficiency ratio of a unit is greatly improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an evaporative cooling chiller heat exchange system and a control method thereof. Background technique [0002] At present, the current chiller technology is based on the current relevant national regulations. The design working condition of the chilled water inlet / outlet temperature is 12 / 7°C, the secondary refrigerant is clean water, the ambient dry / wet bulb temperature is 35 / 24°C, and the unit runs in summer. Cooling mode, shutdown in winter. And some fields, such as rail transit, edible fungi planting, etc., generally require a year-round cooling mode. [0003] The operating power of the evaporative cooling maglev chiller is proportional to the condensing temperature and the ambient temperature. The cooling capacity is directly proportional to the evaporation temperature and the chilled water temperature. How to make the unit operate under the conditions of low co...

AI Technical Summary

Problems solved by technology

When the maglev compressor is starting, stopping or operating at low load, the system cannot meet the pressure ratio applied to the compressor, and the maglev centrifugal compressor is in abnormal operation, and the maglev centrifugal compressor cannot operate under low load conditions. If the customer It needs to run at low load for a long time to meet the cooling demand, and the long-term repeated start / stop will cause damage to the magnetic levitation centrifugal compressor

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