Parameters Optimization And Experimental Research Of R22/R23/R14 Auto Cascade Refrigeration Cycle

In recent years, automatic cascade refrigeration system has received widespread attention with its simple structure and reliable operation. The research and study on automatic cascade refrigeration system mostly adopts dual non-azeotropic mixed refrigerants in the In the academic literature at home and abroad. The research on automatic cascade refrigeration system using ternary non-azeotropic mixed refrigerants is relatively defective, at the same time, the previous studies of ratio of the cascade refrigeration system refrigerant mostly only for one-cooling zone. In order to add the blank of the study on auto cascade refrigeration cycle using ternary non-azeotropic mixed refrigerants, this paper chooses three types of non-azeotropic mixed refrigeration working medium, carried on a research and analysis on automatic cascade refrigeration system using mixed refrigerant R22/R23/R14 from two aspects of numerical simulation and experiment, obtaining the optimal proportion of R22/R23/R14 automatic cascade refrigeration system in -80?——110? refrigeration temperature range, and analyze and compare the influence of different proportion on the cycle performance, exploring the intrinsic laws of this system. The main research of this paper is as follows:(1) To set up the numerical optimization mode of the ratio of the ternary mixed working medium R22/R23/R14, by discussing the three aspects of optimization model, constraint condition and design variables, combined with the optimality principles of refrigeration circulating using mixed refrigeration, to accomplish Matlab optimization program independently, to calculate the optimal proportion of three mixed working fluid R22/R23/R14 when the pressure ratio PR=10, the refrigeration temperature range is -80??-90??-100??-110?, to carry on the exergy analysis at -90? refrigeration temperature range as well, to calculate under different proportions, the exergy loss of the components of the three auto-cascade refrigeration cycle, to get energy utilization situation of the eacht part of the automatic cascade refrigeration cycle, and simply introduced the general measures of reducing exergy loss, improving the efficiency of exergy.(2) To establish the R22/R23/R14 three automatic cascade refrigeration cycle experiment platform, to carry on 15 groups of comparative experiments under different proportions at -90? refrigeration temperature range, according to the start-up operation of the bench, to obtain under different mixing ratio of the working fluid, the gas-liquid separator E2, E3 cooling process, and the compressor suction pressure, discharge pressure, suction temperature, exhaust gas temperature curves over time of the three automatic cascade refrigeration system, to identify refrigerant mixtures of different proportions of the influence on the characteristics of the system start-up and verify that the main conclusions of numerical calculation.(3) To calculate and compared analysis the experimental data, including the comparative analysis of the numerical and experimental values, as well as comparative analysis of the same experiment under different proportions of mixed refrigerants, to sum up the best working conditions, the lowest refrigeration temperature, the best ratio and optimum COP values of the R22/R23/R14 three automatic cascade refrigeration system.