| In the field of energy, national defense, biomedical storage and cryosurgery, the artificial simulation environment of temperature below -50℃is needed. Auto-Refrigeration Cascade (ARC) system is caught more and more attention due to its simple structure, reliable performance and low cost. In this thesis, the auto-cascade refrigeration cycle with R23/R134a mixed refrigerant is studied and analyzed both in theory model and experiment.1) A physical model of Auto-Refrigeration Cascade system with R23/R134a binary refrigerant is set up, and a program is carried out to simulate the system. Through the system simulation program, the influences to the ARC system of input variables including suction pressure, discharge pressure, outlet superheat of evaporating section in evaporative condenser, inlet temperature of the cooling water are analyzed. It is helpful to design ARC experiment system and do the experiment.2) An experimental apparatus of ARC system is designed and set up. With the ARC experiment system, a series of experiments are done in order to find out the rule inside of ARC system. And by changing the running conditions, the influences of various factors to ARC system are studied.3) By changing concentration of the mixed refrigerant, impact of the concentration to ARC system is got. The better concentration of mixed refrigerant 23/R134a then can be obtained.4) According to the comparison of the results between system simulation program and experiment, the system simulation program is modified and will be more accurate. |
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