The chiller is one of the commonly used settings in the refrigeration industry. In order to further improve the cooling effect, the operating system of the unit is also constantly improving. The two-stage compression cascade refrigeration cycle system appeared under this development trend. It can help the chiller in the corresponding low temperature state. Compared with the original system, what aspects have been improved?
If the chiller is cooled by a single compressor, the final cooling result is not bad, but it is limited in terms of its coil heat dissipation, the pressure ratio of the refrigeration cycle, and the physical properties of the refrigerant. In order to obtain the required cooling capacity in an ideal state in all aspects, we tried a two-stage compression cascade refrigeration cycle system, and the effect was unexpectedly good.
The development and application of the new system overcomes a series of drawbacks of the single-stage refrigeration cycle system, and at the same time can obtain low temperature. Because the single-stage refrigeration cycle relies on reducing the opening degree of the expansion valve of the compressor and reducing the refrigerant flow limit to reduce the evaporation pressure and achieve a lower evaporation temperature. That is to say, it achieves the purpose of low temperature on the basis of sacrificing the cooling capacity of the system. The two-stage compression cascade refrigeration cycle is completely different and has such concerns, which can also play a certain protective role on the compressor.
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