车载紧凑式换热器高效轻质的性能优化研究

In the limited space within new vehicles, current plate-fin heat exchangers with offset-strip fins suffer from issues such as inadequate heat transfer, high flow resistance and heavy weight. To address these challenges, an optimization scheme for vehicle-mounted compact heat exchanger is proposed. The study began by conducting tests on four types of air-water plate-fin heat exchangers, each with varying parameters for the offset-strip fins. These heat exchangers were evaluated to analyze their heat transfer and flow characteristics. Based on the experimental data, a 3D numerical model of the offset-strip fin channel was developed, and this model enabled the acquisition of highly accurate heat transfer and flow correlations applicable to a broader range of structural parameters within the heat exchanger. Additionally, a weight calculation model for the heat exchanger's core was derived from its geometric structure. A multi-objective optimization process was conducted using the non-dominated sorting genetic algorithm (NSGA II) and a comprehensive evaluation plot considering both heat transfer and flow resistance performance. Through this optimization process, the key parameters related to fin structure of the vehicle-mounted offset-strip plate-fin heat exchanger were refined, resulting in the identification of a set of fin structure parameters that exhibit high comprehensive performance. By optimization, the flow resistance coefficient was reduced by 14. 3 %, the comprehensive evaluation factor was increased by 1 0 . 7 %, and the core weight of the heat exchanger was decreased by 1 8 . 2 %, contributing to a high-efficiency and lightweight design. This paper presents an optimization scheme specifically for the vehicle offset-strip plate-fin heat exchanger, which can serve as a valuable guidance for improving the overall performance and reducing manufacturing costs of similar heat exchangers used in vehicle applications.