Substantiation of the possibility of gas liquefaction in oil-free low-speed refrigeration compressors

Existing refrigeration machines, as you know, contain the main four units that carry out the Existing refrigeration machines, as is known, contain four main components that carry out the refrigeration cycle: compressor, condenser, expander and evaporator. Currently, the liquefaction of the refrigerant occurs in the condenser. Creating conditions under which condensation of the working fluid would occur in the compressor unit would make it possible to create a compact refrigeration machine by eliminating the condenser from it. The purpose of this work is to prove the possibility of creating a compact refrigeration machine with the implementation of the process of condensation of the working fluid in the compression chamber of the compressor. The object of the study is a low-speed compressor, in which the pressure ratio significantly exceeds known analogues and at the same time the temperature is significantly lower than high-speed machines due to the creation of conditions under which compression occurs with polytropic indicators below 1.08. The research method is based on determining the gas temperature at critical pressure and comparing the obtained result with the critical temperature. The system of equations and assumptions used relates to the model with lumped parameters of the working fluid. The results obtained on the compression of such refrigerants as ammonia, carbon dioxide, R12, R22, Freon-134a showed the possibility of obtaining the required pressures in a low-speed machine at temperatures significantly below the critical one. The work examines and proposes for further study those working fluids of refrigeration machines that, due to their characteristics and operating parameters in the refrigeration machine, can go into the liquid phase in a low-speed compressor unit, which, with further experimental confirmation, will allow partial or complete elimination of the condenser unit in the refrigeration machine.