The NH3/CO2 cascade refrigeration system consists of two parts: a high-temperature stage and a low-temperature stage. The high-temperature stage uses NH3 as the refrigerant, while the low-temperature stage uses CO2 as the refrigerant. The evaporation of refrigerant NH3 in the high-temperature system is used to condense the refrigerant gas CO2 discharged from the low-temperature stage. A condenser evaporator is used to connect the high and low temperature stages, which is both the condenser of the low-temperature stage and the evaporator of the high-temperature stage. The heat load is transferred to the CO2 refrigerant through the end evaporator, and the heat absorbed by the CO2 refrigerant is transferred to the high-temperature NH3 refrigerant through the condenser evaporator. The high-temperature NH3 refrigerant then transfers the heat to the high-temperature condenser and releases it to the environment through the cooling medium. The condensed CO2 in the condenser evaporator enters the CO2 storage tank, and then enters the CO2 gas-liquid separator through the drying filter and throttle valve. The liquid CO2 is pumped through the CO2 circulation pump to the CO2 evaporator (end cooling device, such as a single freezer or air cooler); After passing through the evaporator, the two-phase CO2 returns to the gas-liquid separator, and the gaseous CO2 is sucked in by the compressor. After compression, it enters the condenser evaporator for condensation. In this way, the entire cascade refrigeration cycle is completed in a cyclic manner.
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