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    • Research on Equivalent Calculation Method of the Overall Heat Exchanger Based on Non-Uniform Flow of Heat Exchanger Units
    DOI：10.13949/j.cnki.nrjgc.2022.03.002
    Key Words:compact heat exchanger  oil cooler  trans-scale  porous media  numerical simulation
    Author NameAffiliationE-mail
    LIU Kaihua* Power Machinery and Vehicular Engineering Institute， Zhejiang University， Hangzhou 310063， China 21927001@zju.edu.cn 
    FU Jiahong Department of Mechatronics Engineering， Zhejiang University City College， Hangzhou 310015， China
    Zhejiang Yinlun Machinery Co.， Ltd.， Taizhou 317200， China     		 
    CHEN Xiaofei China North Engine Research Institute， Tianjin 300400， China  
    SUN Xiaoxia China North Vehicle Research Insitute， Beijing 100072， China  
    ZHANG Yu Department of Mechatronics Engineering， Zhejiang University City College， Hangzhou 310015， China  
    LIU Zhentao* Power Machinery and Vehicular Engineering Institute， Zhejiang University， Hangzhou 310063， China liuzt@zju.edu.cn 
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    Abstract:In order to solve the problem that the overall performance of heat exchanger could hardly be simulated due to the large scale range between fin and heat exchanger and the lack of experimental data， a equivalent calculation method based on non-uniform flow of heat exchanger unit was developed. With this method， the flow and heat transfer characteristic parameters of the heat transfer unit were extracted from an oil cooler unit model by numerical simulation. Then the parameters were brought into the equivalent calculation with the whole oil cooler model simplified as porous media. Results showed that the pressure drop and capacity of the oil cooler obtained by this method were consistent with the experimental data in a wide range. The average error of heat transfer rate was 3.5% in experiment conditions. The heat transfer accuracy of the oil cooler simulation was influenced by fitting accuracy of parameters of heat transfer， which could be improved by adding simulated working conditions of the heat transfer unit.
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