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display cooler cascade refrigerator
author: supermarket refrigerated showcase category: walk-in display coolers Views: 580Time: 2016-08-22
display cooler cascade refrigerator
display cooler cascade refrigerator usually consists of two parts (or three parts), called the high temperature part and the low temperature part. The high temperature part uses medium temperature refrigerant, and the low temperature part uses low temperature refrigerant. Each part is a complete single-stage or two-stage refrigeration system. In the high-temperature part of the system, the evaporation of the refrigerant is used to condense the refrigerant in the low-temperature part of the system. Only the refrigerant in the low-temperature part of the system absorbs heat from the object to be cooled when evaporating. The high temperature part and the low temperature part are connected by a condensing evaporator, which is both the evaporator of the high temperature part and the condenser of the low temperature part. The refrigeration temperature range of the cascade refrigeration device is related to the form of the cycle and the type of refrigerant.
For example: The cascade refrigeration unit composed of two single-stage compression systems R22 and Rl3 in the display cooler has an applicable temperature range of -60 to -85°C. The cascade refrigeration unit composed of R22 two-stage compression system and R13 single-stage compression system, the applicable temperature range is -80~-110℃. A schematic system diagram of a cascade refrigeration unit composed of two single-stage compression systems. The left end of the figure is the high temperature part of the refrigeration cycle, the refrigerant is R22; the right end is the low temperature part of the refrigeration cycle, the refrigerant is R13. The condensing evaporator links the two refrigeration cycles together. The t-S diagram of the cascade refrigeration cycle. In the low-temperature part of the refrigeration cycle in the figure, the evaporation temperature of R13 is -80°C, and the corresponding evaporation pressure is 1.12Xl05Pa; the condensation temperature is -25°C, and the corresponding condensation pressure is about 9.8Xl05Pa. In order to ensure the condensation temperature of R13, it is required that in the high-temperature part of the refrigeration cycle, the evaporating temperature of R22 is lower than the condensation temperature of the low-temperature part of the refrigeration cycle ' generally 3~5°C lower. If you take 5°C, in this example, in the high-temperature part of the refrigeration cycle, the evaporation temperature of R22 should be -30°C, and the corresponding evaporation pressure is 1.63Xl05Pa. If the condensation temperature of R22 is 30°C, the condensation pressure is 11.92× 105Pa, and the compression ratio is equal to 7.3. It can be seen that the display cooler cascade refrigeration cycle not only exerts the advantages of R22 and R13, but also overcomes their shortcomings, making it possible to produce very low temperatures.
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