Experimental Studying Of Small-sized Ejector Applied In Min Solar Jet Refrigeration System

As people pay more attention to energy and environmental problems, solar jet refrigeration that uses solar energy as main power is focused on through the world. As it is, because the mechanical refrigeration has the advantages of compact system, stable operation, simple maintenance, this type of refrigeration has been widely used. However, mechanical refrigeration consumes a great amount of energy. The energy consumption of it accounts for more than most of the total energy consumed in the dwelling houses and office buildings. In order to achieve sustaining development of national economy and in the light of the policy of energy conservation and pollution protection, to develop non-compression refrigeration, such as solar, waste heat, or ground heat derived jet refrigeration should be encouraged greatly.Scholars of inside and outside have studied the jet refrigeration a lot, having gained much important results. But the papers on ejector applied in jet solar refrigeration hasn't been much published yet, especially the research of small-scale ejector with low-boil and environmental-friendly working fluid. Based on the above problems, this paper design a small-scale ejector tested bed, to study the performance of small-scale ejector applied in min jet solar refrigeration.The paper gives out the following aspects studying. The fundamental theory of ejector design, including, the principals and specialties of ejector, the main running parameters of ejector, the main performance parameters of ejector, the calculation of ejector structure, the thermal model of ejector. The experimental studying of small-scale ejector applied in min jet solar refrigeration, including, the design for test-bed, the experimental method, the data processing and results of experiment, the experimental error analysis, the comparison between experimental and numerical. The analysis of experimental data, including, the first part for analyzing orthogonal experiment, the second part for analyzing experimental data, the coefficient of efficiency and the introduction of improvement method used in entrained ratio solving method for small-scale ejector.Referring to great experimental and numerical papers, basing on the practical experimental situation, it is selected the adjusting range of the distance from the outlet of nozzle to the inlet of constant section, the length of constant section, the pressure of working fluid, the pressure of entrained fluid and the pressure compressor fluid, respectively. According to the relevant numerical calculation, it is analyzed the rationality of the experiment design indirectly. There are some results for the small-scale ejector applied in small jet solar refrigeration system from the analysis of the experimental data, including, the approximately adjusting range for the nozzle location and the length of constant section, the influence of running parameters and making out the running regulation for practical using, the coefficient of efficiency used in the theoretical calculation with small expand ratio under experimental data and the improvement for the method, which advances the precision and efficiency.The task in this paper reminds that the configuration parameters design for small-scale ejector varies different form these great expand ratio and compressor ratio ones, the improvements for configuration parameters design also enhance the performance of ejector, the results of experiments give out some guidance for the practical using, the improvements of method for calculating theoretical entrained ratio, combined the experimental data, is a meaningful try.