Simulation And Experiment Research About Two-Phase R744 Ejector Refrigeration System

In this paper,the ejector theory and description of cycles are introduced at first.The following are experimental methods and the test facility modification.There are two test facilities involved in this thesis work.The first one is to give the overall view of the ejector performance.And the other one is to compare two systems performance using this ejector.Some simulation works present at last.Experimental analyses of two experiments are presented.First one is overall view of ejector performance,it shows where the high efficiencies lies on the working conditions.The results can guide the test points choosing on the second experiment.Second one is comparison of two systems,which are Burk cycle(DOS)and Oshitina cycle(COS).The comparisons are about the two systems' COP and exergy increase in the evaporator side.Then the uncertainty analysis is introduced to complete the experimental analysis.At last the computational simulation on the ejector and cycles are done.The ejector model is developed based on Kornhauser ejector model.The assumptions and the applied equations in the thermodynamic model are described below.The comparisons of the cycle model results and experimental results are also presented below.At last an expansion valve cycle is built to present how the ejector can help improving the system performance.Some limitation of the model are shown.