| 摘要 |
A refrigeration system and cycle are disclosed. The system includes a compressor, condenser, injector nozzle, evaporator, and refrigerant separator tank connected in series in a primary refrigerant path. The compressor overfeeds the condenser with refrigerant which therefore condenses only partially to a wet vapor in the condenser. The injector nozzle completes condensation, drawing liquid refrigerant from the separator tank to inject it into the evaporator. The evaporator is a shell and tube heat exchanger, the tubes being product fluid conduits. The shell side of the evaporator is overfed with liquid refrigerant so that most of it does not evaporate. A liquid/vapor refrigerant emulsion is thus produced, maintaining a constant phase transition temperature in the evaporator. The high flow rate of this emulsion within the evaporator creates a turbulence preventing boundary layers from forming on heat exchange surfaces. The separator receives refrigerant from the evaporator, separates liquid from vapor, and feeds the injector nozzle with liquid and the compressor with vapor. A secondary refrigerant line from the compressor outlet to the injector nozzle outlet bypasses the condenser and the injector nozzle. A shut off valve opens this line to admit heat to the evaporator when product temperature reaches a preestablished lower limit, and closes when product temperature reaches a preestablished upper limit.
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