Calculation and Analysis of Different Refrigerant Jet Refrigeration Performance
Abstract: Introduction of refrigerants The actual physical properties of the ejector are established, and the ejector thermodynamic model is established; the pressure and velocity change trends and injection coefficients of the working fluids with similar boiling points in the ejector are compared, and the main physical property factors that cause the difference in ejector performance are discussed; several groups with similar boiling points are compared The jet refrigeration performance of the refrigerant. The results show that for working fluids with similar boiling points, the specific enthalpy of general working steam is more quotient. The higher the injection coefficient; for working fluids with similar boiling points, R717 has better performance than R290, R152a is better than R134a, R14]b is better than R123, and R142b is better than R600af. Among all refrigerants studied, the refrigeration performance of R717 is z* Well, R152a comes next, and the difference between the COP (coefficient of performance) values u200bu200bof the two increases as the temperature rises.
Keywords: jet refrigeration; injection coefficient; COP; refrigerant
Introduction
The jet refrigeration system uses low-grade energy, such as solar energy , Geothermal energy, industrial waste heat, etc. are used as driving sources to improve the effective use of energy, and the system is simple, the moving parts are few, and the maintenance is convenient. It is a cooling method worthy of development. However, the efficiency of this system is low compared to other systems. The performance of the ejector refrigeration system is not only affected by its own operating parameters and the geometric structure of the ejector, but also by the refrigerant. Therefore, proper selection of refrigerant is an effective measure to improve the efficiency of the ejector refrigeration system. This research direction has also become a research hotspot in recent years. Sun [1] compared the performance of 11 working fluids including freon, and found that the COP value of jet refrigerators when water is used as the working fluid is very low, and better performance can be obtained when R152a is used as the working fluid. ; Dorantes et al.'2] proposed an empirical formula for predicting the performance of pure working fluid and non-azeotropic mixture ejectors on the basis of experiments; Selvaraju et al. 41 compared the ejector refrigeration system with R134a, R152a, R290, R600a and R717. The critical performance of a refrigerant as the working fluid. The experimental results of Holton [5] showed that the performance of the ejector was better when a working fluid with a larger molecular weight was used; Invernizzi et al. L60s* tried to determine the working fluid of the jet refrigeration cycle according to the critical temperature and molecular complexity of the refrigerant. Carrying out thermodynamic optimization; Zheng Aiping [71] Through the theoretical analysis and thermal calculation of several refrigerants in the ejector refrigerator, he found the z* best application temperature range of various refrigerants, and screened out that R600a is a more ideal refrigeration Working fluid; Wang Qian et al. [8j] compared the thermal properties of R141b, R123 and R11, and conducted jet refrigeration cycle experiments on R141b and R123. Theoretical analysis and experimental data show that R141b is an ideal jet refrigeration working fluid.
According to the refrigerant physical properties table, the generator pressure, condensing pressure and evaporation pressure of refrigerants with similar standard boiling points are also close under the same working conditions. For example, the three working fluids R11, R123 and R141b have similar boiling points and physical properties. Researchers have begun to choose the latter two as alternatives to the fluorine spray refrigeration cycle. In this paper, the actual physical properties of the refrigerant are introduced, and the thermodynamic performance model of the ejector is established. Among the environmentally friendly refrigerants, the reasons for the difference in the injection coefficients of the refrigerants with similar boiling points are discussed, and several groups of refrigerants with similar boiling points are compared. After z*, the performances of two working fluids with excellent refrigeration performance of z* are compared under different working conditions.
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