Vapor compression refrigerating cycle, control method thereof, and refrigerating apparatus to which the cycle and the control method are applied

Abstract

The vapor compression refrigerating apparatus of the invention comprises a compressor, a condenser, a regeneration heat exchanger, an expansion means, and an evaporatorconnected in series. The vapor compression refrigerating cycle is based on a cycle corresponding to a reversed Ericsson cycle in which isothermal heat dissipation process and isothermal heat absorption process occur overstriding a saturated vapor line and saturated liquid line respectively and heat exchange is carried out between isobaric heat dissipation process in a liquid zone and isobaric heat absorption process in a superheated vapor zone. A process part occurring in a superheated vapor zone of the isothermal heat dissipation process (an isothermal compression process) is substituted by adiabatic compression and isobaric heat dissipation, the adiabatic compression being carried out by the compressor and the isobaric heat dissipation being carried out in the condenser together with remaining process part occurring in the superheated vapor zone of the isothermal heat dissipation under isothermal and isobaric condition. A part of the isobaric heat dissipation in the liquid zone is carried out in the regeneration heat exchanger by releasing heat from refrigerant liquid to refrigerant vapor entering the compressor, remaining process part of the isobaric heat dissipation in the liquid zone is substituted by isenthalpic or isentropic expansion, the expansion being carried out by the expansion means, and expanded refrigerant is introduced to the evaporator to carry out isothermal and isobaric heat absorption and then to be sucked into the compressor.