Investigation Of Direct Evapprative Solar Ejector Cooling System By CFD

With the shortage of energy and environmental pollution, people pay more attention to it. The development and utilization of new green(environmental protection) energy is an effective way to alleviate the current tight energy supply and improve the environmental pollution. Solar energy is the most widely used clean energy in nature. Efficient use of solar energy is the scientific research focus of scholars at home and abroad. Solar ejector refrigeration technology is a kind of energy-saving and environmentfriendly refrigeration technology, its biggest advantage is that it uses solar energy instead of electric energy consumption to increase the pressure of the working medium in the refrigeration system, in order to replace the compressor to make refrigeration. In this paper, the direct evaporation type solar energy injection system is studied. First of all, the paper establishes mathematical model and physical model of the system, and theoretically analyzed the main components of the system, including the performance index and the related technical parameters, which provide the main basis for the equipment selection of the whole system. This paper focuses on the performance of ejector and the analysis of the working principle. According to the the calculation principle of Sokolov ejector, the paper simplifies the physical model of system based on the reasonable assumptions. Then according to the relevant empirical formula, writing a design calculation program with using VB software, selecting the R134 a refrigerant, and then designing to ejector that is suitable for direct evaporation solar ejector refrigeration system. In this paper, the design of the ejector is simulated in the numerical by using FLUNT software, the change of the internal flow field is analyzed, and the shock phenomenon is also analyzed simply. The paper uses the convenience of software to analyze the influence of the change of working parameters on the ejector performance, and getting the conclusion: the pressure of the working fluid and the outlet pressure of the mixed fluid are too small, which will cause reflux. In the end, the paper simulate the ejector working parameters of maximum allowable range, which provide the basis for its normal operation in the system.