Numerical Simulation And Experimental Study On Parallel Flow Heat Exchanger For Electric Bus

The parallel flow heat exchanger as the research object to study the louvered fin,a three-dimensional numerical model for traditional rectangular louver fins by using ANSYS15.0,and study the air side heat transfer and flow performance,the pressure drop and heat transfer coefficient of the numerical simulation results were compared with the experimental results that the errors are 11.16% and 2.175%,respectively in the simulation data and the experimental value is consistent with the overall good on practical projects in the allowable error range.In the study of the heat transfer and flow performance of rectangular fin with different thickness,the performance evaluation factor j/f1/3 was used to evaluate the fin thickness with different fin thickness.The results show that the louver fin thickness is 0.06 mm,the air side of the louver fin heat transfer and flow performance of the best,in consideration of the actual production process in the pursuit of maximum economic benefits when considering the production cost,cooling weight ratio and other factors,as recommended by the fin thickness fin structure 0.06 mm.On the basis of the traditional rectangular louver fin,puts forward a new type of double trapezoidal louver fin structure,compared with the traditional rectangular,louvered fin heat transfer performance.The results show that the heat transfer performance of double trapezoidal structure of louver fin is better than the traditional rectangular louver fins.The influence of the structure parameters of the double trapezoidal louvered fin(fin pitch FP,the oblique angle of the louver,the double trapezoid height h)on the heat transfer and flow performance was studied.The results show that the heat transfer and flow performance of the parallel flow heat exchanger are different under different wind speeds.The optimum structure parameters of double trapezoidal louver fin,double trapezoidal louver fin best trapezoid height is h3=0.4mm,the optimum fin spacing of FP=1.4mm,spacing LP=1.1mm louver shutters,oblique angle =22 degrees,the double trapezoidal louvered fin heat transfer and flow to achieve the best performance.