Study On The Dynamic And Experimental Characteristics Of Absorption-Compression Hybrid Refrigeration System Driven By Waste Heat From Automobile Engine

With the increasing of fossil fuel consumed by vehicles, technologies of energy saving and emission reduction for vehicles are paid more and more attention in recent years. At present most of automobile air conditioning use compression refrigeration system to supply cooling capacity, which can raise the engine fuel consumption and exhaust gas emission. Thus it will be a good solution to investigate how to reasonably and efficiently recover the waste heat from engine exhaust gas and cooling water to drive absorption refrigeration, realizing cascade utilization of energy.In order to understand the change regulation of system performance parameter along with the time and better design automatic control system in heat transfer process, this paper put forward a dynamic simulation program of air-cooled bubble absorption refrigeration system, using R124-DMAC as working fluids. Based on that, the author simulated the variation of single-effect absorption refrigeration system performance parameters with the time under different conditions, and analyzed the disturbance characteristics. Then according to vehicles operating actual situation, the author simulated the influence of different exhaust parameters and medium pressures to two-stage absorption-compression hybrid refrigeration system. These simulating results make prediction of system performance more convenient and lay the foundation for the calculation of thermo-physical and optimization of the theoretical model. After that, a full air-cooled bubble absorption refrigeration test system driven by waste heat is designed and built. The experimental results show accuracy of the dynamic simulation, and verify the stability of this system. The operating parameters are tested through changing heat source temperature, chilled water temperature and pump flow rate. By this study, it shows practicability of working fluids similar to R124-DMAC applying on the vehicle air conditioning, and provides reference for further study of vehicle absorption refrigerator.