Study on structure optimization of heat exchanger and evaluation index of heat transfer performance

被引：0

作者：

Liu X. ^{[1
]}

Zhang S. ^{[2
]}

Zhou Z. ^{[2
]}

Zheng H. ^{[2
]}

Wang C. ^{[2
]}

Shi H. ^{[3
]}

Li M. ^{[3
]}

机构：

[1] Military Representation Office of Military Representative Bureau of Naval Equipment Department in Wuhan Area, Wuhan, 430000, Hubei

[2] China Ship Development and Design Center, Wuhan, 430000, Hubei

[3] MOE Key Laboratory of Thermal Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi

来源：

Huagong Xuebao/CIESC Journal | 2020年 / 71卷

关键词：

Design; Evaluation index; Experimental validation; Heat exchanger; Heat transfer; Optimization;

D O I：

10.11949/0438-1157.20191189

中图分类号：

学科分类号：

摘要：

There are some problems in the cooler of a launch vehicle. Firstly, the pressure loss of the shell side is large. Secondly, the segmental baffle structure makes the working substance flow in Z-shape. It is easy to form a dead zone behind the baffle, which promotes scaling on the shell side and reduces the overall heat transfer performance of the heat exchanger. Two heat transfer enhancement schemes for shell-side structures are proposed in this paper. The first scheme is to reduce the number of segmental baffles and increase the baffle spacing. The second scheme is to replace the original baffles with helical baffles. In order to verify the accuracy of the thermodynamic design method adopted in this paper, the thermodynamic design method of segmental baffle and helical baffle shell-and-tube heat exchangers are verified according to the experimental results in literature. The results show that the deviation between the experimental results and the calculated data obtained by the thermodynamic design method in this paper is within 37%, which meets engineering requirement. According to different optimization parameters, the optimization results are different. There is basically a following rule: the optimal design can reduce the total pressure drop on both shell and tube sides of heat exchanger, but its heat transfer performance decreases at the same time. Therefore, a comprehensive index is needed for evaluation. In this paper, the ratio of heat transfer Q to power consumption caused by flow resistance of heat exchanger is proposed as a comprehensive performance evaluation index. This index indicates that exchanging heat quantity obtained by heat transfer system per unit pump power. The larger the value, the better the economy. After calculation, it is found that the comprehensive evaluation index of the optimal scheme is increased by about 22.2% compared with the original scheme. © All Right Reserved.

引用

页码：98 / 105

页数：7

共 30 条

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