Design And Experimental Study Of Two-phase Ejector In Injection Refrigeration

In engineering applications,the performance of the ejector is related not only to the system conditions,but also to the factors such as the material,the size of the key parts and the working environment.The working fluid of Liquid gas-liquid ejector device is two-phase fluid,and common two-phase ejector(liquid-gas ejector,gas-liquid ejector)internal flow characteristics of different flow analysis of fluid in nozzle is more complex,which increases the difficulty of design and internal flow ejector.In order to reduce the throttle loss produced by conventional steam compression refrigeration cycle in the process of the objective,in the refrigeration cycle in the design process of eliminating throttling device and use the new design of two-phase ejector refrigeration cycle experimental system and built a test bench for injection,and the performance of the ejector refrigeration cycle is improved by experimental verification.The basic law in the flow process of the liquid jet,the paper introduce a set size correction coefficient according to the size of the key parts of the design method.Then author through experiments to determine the optimum correction factor and put forward the design method of jet refrigeration cycle.Experiments using R22 as refrigerant,with Labview8.5 collecting data.The new system uses the ejector to replace the throttle device of conventional refrigeration system components that can effectively improve the COP.Under given conditions,COP enhance 11%-15.81%.The new system can improve the evaporation temperature,and the jet refrigeration can not only recover the throttle loss caused by the throttle mechanism,and the energy-saving effect is remarkable.The working pressure is 9.5 bar,injection pressure is 4.5 bar,mixed pressure is 5 bar,? =0.95 and not only the measuring point condition conforms to the design conditions,the experimental results and empirical formulas for calculating jet coefficient of mean value error is less than 3%,proving that the size design method is feasible.In addition,the ejector coefficient reaches the highest at the corrected ? =0.95,and then decreases through the data analysis.According to the formula for calculating the theoretical size of the liquid gas-liquid ejector after adding the correction coefficient,the design program of the size of the output can be directly output by inputting the conditions on the VB platform.