Optimization method of entrance structure in heat exchanger
                                                                            ZHOU Si hang1, PENG Xiang2
       (1.CRRC. Hangzhou Co., Ltd., Hangzhou 310019, China；2.Key Lab. of E&M., Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Aiming at the flow nonuniform and deteriorative performance in the heat exchanger, study on the unreasonable structure design of inlet header and deflector was carried out. An optimization design method of entrance structure was proposed to decrease the flow nonuniformity. Firstly, the flow of the internal header was analyzed using CFD simulation method, and the flow uniformity under different structure parameters of deflector were calculated. Then the correlation model among structure parameters of inlet header and deflector, thermal efficiency of heat exchanger was constructed. Finally, three types of entrance structure were optimized to decrease the heat loss of heat exchanger as traditional inlet header, modified inlet header, and second modified inlet header. The results indicate that second modified inlet header is the best head type.

Key words: heat exchanger; inlet header; flow no uniformity; deflector; CFD