Water chilling unit and air supplementing adjusting method thereof

Abstract

The invention provides a water chilling unit and an air supplementing adjusting method thereof, relates to the technical field of air conditioning equipment, and solves the technical problem that an existing water chilling unit cannot adjust or control air supplementing . The water chilling unit comprises a two-stage compressor, a condenser, a flash evaporator and an evaporator, wherein an air supplementing pipe is arranged between the flash evaporator and the two-stage compressor, an outlet of the air supplementing pipe is communicated between a first-stage impeller and a second-stage impeller of the two-stage compressor, and an adjusting valve is arranged in the air supplementing pipe. A first pressure sensor is arranged in the condenser, a second pressure sensor is arranged in the evaporator, and a third pressure sensor is arranged in the flash evaporator. When the water chilling unit operates normally, the adjusting valve is controlled by comparing the flash pressure with the intermediate pressure, if the flash pressure is smaller than or equal to the intermediate pressure, the adjusting valve is turned down to reduce the air supplementing amount, and if the flash pressure is larger than the intermediate pressure, the adjusting valve is turned up to increase the air supplementing amount, so that the pressure ratio of the first-stage impeller and the pressure ratio of the second-stage impeller are better matched, and the operation energy efficiency of the water chilling unit is improved.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a water chiller and an air supply adjustment method thereof. Background technique [0002] At present, most centrifugal chillers use two-stage compressors. In order to further improve the energy efficiency of unit operation, an intermediate economizer (i.e. flasher) is provided. The liquid refrigerant at the bottom of the condenser enters the flasher after a first-stage throttling, and the liquid refrigerant in the flasher enters the evaporator after a second throttling, and the gas refrigerant is directly fed into the second-stage impeller of the compressor for compression . Since the part of the gas fed into the compressor from the flasher is not compressed by the first-stage impeller, the power consumption of this part of the compressor is saved and the energy efficiency of the unit is improved. [0003] The applicant finds that the prior art has at least...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a water chiller and its air supply adjustment method to solve the technical problem in the prior art that the water chiller does not have adjustable control for air supply

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