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Screw type display cases with economizer Refrigeration compressor
author: supermarket refrigerated showcase category: walk-in display coolers Views: 584Time: 2016-08-22
Screw type display cases with economizer Refrigeration compressor
Screw type display cases Although the refrigeration compressor has the advantage of a high single-stage pressure ratio, as the pressure ratio increases, Leakage losses increase rapidly, therefore, the efficiency is significantly reduced when operating under low temperature conditions. In order to expand its scope of use, improve the performance of low-temperature conditions, and improve efficiency, the display cases screw refrigeration compressors can use the one-way suction, compression, and discharge characteristics of the screw refrigeration compressor, and set up the air supply port at the appropriate position of the casing or end cover. Make the rotor element volume communicate with the air supplement port in a certain angle range of the compression process, and make the flash gas in the intermediate container added to the system enter the element volume through the air supplement port. In this way, the single-stage screw compressor works according to the two-stage refrigeration cycle to achieve the effect of energy saving. The intermediate container added here is called an economizer.
display cases with economizer The refrigeration system has two forms of primary throttling and secondary throttling. A diagram of a first-stage throttling refrigeration system with an economizer. The refrigerant liquid from the accumulator D is divided into two branches: a small branch flows through the throttle valve Gi to reduce the pressure, and then absorbs heat into the economizer E to generate flash gas , Enters the elementary volume in the initial stage of compression through the middle air supply port, mixes with the original gas and continues to be compressed: the other main stream flows through the coiled tube in the economizer E to release heat and is supercooled, and then throttling Valve G2, throttling into the evaporator F for refrigeration. The mainstream refrigerant liquid entering the evaporator of the display cases is throttled only once, and there is a temperature difference At before the throttle and the gas entering the air supply port.
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