Parallel unit for refrigeration house direct expansion liquid supply refrigeration system and working method thereof

Abstract

The invention provides a parallel unit for a refrigeration house direct expansion liquid supply refrigeration system and a working method thereof. According to the parallel unit for the refrigeration house direct expansion liquid supply refrigeration system and the working method thereof, the direct expansion liquid supply refrigeration system is suitable for a refrigeration house or an elevated warehouse with the evaporator installation position being high and the liquid supply height exceeding 12.0 m, and therefore the complexity of the refrigeration system, the area of a machine room and the refrigerant filling amount are reduced, the operation efficiency is improved, and investment is reduced. Refrigerant gas flowing out of an evaporator passes through a refrigeration compressor and then is discharged to an oil separator; the oil separator separates out lubricating oil, refrigerant gas is conveyed to a condenser, and the lubricating oil enters an oil distributor and then enters the refrigeration compressor; refrigerant liquid flowing out of the condenser enters a high-pressure liquid reservoir; one path of refrigerant liquid flowing out of the high-pressure liquid reservoir enters a subcooler shell and is cooled and depressurized to the pressure and temperature required by the working condition, and the other path of refrigerant liquid enters a subcooler coil and enters the evaporator after being cooled; and the refrigerant liquid in the subcooler shell is changed into saturated refrigerant gas, and then the saturated refrigerant gas enters a gas return header of the refrigeration compressor.

Description

technical field [0001] The invention relates to a parallel unit used in a direct expansion liquid supply refrigeration system of a cold storage and a working method thereof. Background technique [0002] Under the influence of the enhancement of people's consumption concept and national policies, a large number of refrigeration, refrigerated storage and cold chain logistics cold storages have emerged as the times require. In order to ensure the scale of cold storage and reduce land investment, many units have proposed or built double-layer cold storage or elevated storage close to 24.0m under the premise of following the "Code for Design of Cold Storage". [0003] In conventional refrigeration system design, when the liquid supply height exceeds 12.0m, in order to prevent the refrigerant liquid in front of the throttle valve of the evaporator from vaporizing due to pressure drop, a refrigeration system with liquid pump supply is generally used instead of direct expansion Li...

AI Technical Summary

Problems solved by technology

Compared with the direct expansion liquid supply refrigeration system, the liquid pump liquid supply refrigeration system increases the number of equipment, the area of ​​the machine room, the initial investment and the refrigerant charge, and increases the equipment failure rate and maintenance cost.

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