Cascade systems
At very low temperatures, the differential between the suction pressure and condensing pressure can be minimized by using the cascade system of exploitation.
In such a system, the low-temperature scheme works on refrigerant selected to give adaquate pressure is very low boiling point, a necessary process, and the high phase of the scheme works on refrigerant selected to give, at the condensation temperature is dictated by the cooling medium available, normal pressure of condensation. Capacitor low temperature in the circuit evaporator high stage of the chain (see GPG 283 Design of energy efficient refrigerators)...
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