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A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

Author

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  • Saranmanduh Borjigin

    (Key Laboratory of Thermo-Fluid Science and Engineering, MOE, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ting Ma

    (Key Laboratory of Thermo-Fluid Science and Engineering, MOE, Xi’an Jiaotong University, Xi’an 710049, China)

  • Min Zeng

    (Key Laboratory of Thermo-Fluid Science and Engineering, MOE, Xi’an Jiaotong University, Xi’an 710049, China)

  • Qiuwang Wang

    (Key Laboratory of Thermo-Fluid Science and Engineering, MOE, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

Longitudinal heat conduction has a significant effect on the heat transfer performance of plate heat exchangers, but longitudinal heat conduction is usually neglected in numerical studies and the thermal design of a heat exchanger. In this paper, heat transfer models with and without longitudinal heat conduction are proposed to analyze the effect of small-scale longitudinal heat conduction in a plate heat exchanger. The performance of small-scale longitudinal heat conduction is illustrated by temperature and heat flux contours in the heat transfer models with and without longitudinal heat conduction. The results show that small-scale longitudinal heat conduction occurs in the plate and a more uniform temperature profile of the plate is obtained due to small-scale longitudinal heat conduction. In balanced flow, the contributions of longitudinal heat conduction for counter-flow, cross-flow and parallel-flow plate heat exchangers are −3.15%, −0.09% and 0, respectively, whereas, for the respective unbalanced flows they are evaluated to be −1.73%, 0.53% and 0.05%, respectively. Moreover, it is observed that small-scale longitudinal heat conduction in plates is influenced by the thermal conductivity of the plate. The higher the thermal conductivity, the larger is the reduction of thermal performance. The contribution of longitudinal heat conduction varies from −0.54% to −4.01%.

Suggested Citation

  • Saranmanduh Borjigin & Ting Ma & Min Zeng & Qiuwang Wang, 2018. "A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers," Energies, MDPI, vol. 11(7), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1727-:d:155667
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    References listed on IDEAS

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    1. Qingwei Miao & Shijun You & Wandong Zheng & Xuejing Zheng & Huan Zhang & Yaran Wang, 2017. "A Grey-Box Dynamic Model of Plate Heat Exchangers Used in an Urban Heating System," Energies, MDPI, vol. 10(9), pages 1-16, September.
    2. Wang, Qiuwang & Zeng, Min & Ma, Ting & Du, Xueping & Yang, Jianfeng, 2014. "Recent development and application of several high-efficiency surface heat exchangers for energy conversion and utilization," Applied Energy, Elsevier, vol. 135(C), pages 748-777.
    3. Lin, Mei & Wang, Qiu-Wang & Guo, Zhixiong, 2016. "Investigation on evaluation criteria of axial wall heat conduction under two classical thermal boundary conditions," Applied Energy, Elsevier, vol. 162(C), pages 1662-1669.
    4. Abu-Khader, Mazen M., 2012. "Plate heat exchangers: Recent advances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(4), pages 1883-1891.
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    Cited by:

    1. Lihui Zhang & Zhenzhen Chen & Donghui Wen & Xudong Wang & Daqian Zhang & Jun Liang, 2018. "Estimation of the Time-Varying High-Intensity Heat Flux for a Two-Layer Hollow Cylinder," Energies, MDPI, vol. 11(12), pages 1-16, November.
    2. Francesco Calise & Mário Costa & Qiuwang Wang & Xiliang Zhang & Neven Duić, 2018. "Recent Advances in the Analysis of Sustainable Energy Systems," Energies, MDPI, vol. 11(10), pages 1-30, September.

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