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Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles

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  • Wenhe Zhou

    (School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education, Lanzhou 730070, China)

  • Shuo Cheng

    (School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
    Key Laboratory of Railway Vehicle Thermal Engineering of Ministry of Education, Lanzhou 730070, China)

  • Jia Wang

    (Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan 430010, China)

  • Yong Liu

    (Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan 430010, China)

Abstract

The performance of the Plate Indirect Evaporative Cooler (PIEC) can be effectively improved by incorporating baffles in the dry channel. However, in the dimensional influence of the baffles on PIEC performance there remains a research gap. In order to investigate the impact of baffle dimensions on the wet bulb efficiency, namely the average heat transfer coefficient and the cooling capacity of the PIEC, this paper proposed and verified a three-dimensional numerical model and method based on the species transport model and the Euler wall film model. At the same time, in order to obtain the equilibrium point between the enhanced heat transfer performance and the additional resistance induced by baffles, a comprehensive performance evaluation index is introduced. The results indicate that, under the same conditions, (1) the baffle effect on PIEC performance is significant at a lower inlet air velocity, and the wet bulb efficiency of the PIEC with baffles can be improved by 22.8%; (2) the baffle effect on PIEC performance is negative if its relative length exceeds 60% or the primary air inlet velocity surpasses 4 m/s under the conditions specified in this paper; and (3) the baffle effect on PIEC performance is significant when its channel height is lower and its channel width is larger, and the wet bulb efficiency of the PIEC with baffles can be improved by 29.3%.

Suggested Citation

  • Wenhe Zhou & Shuo Cheng & Jia Wang & Yong Liu, 2024. "Numerical Analysis on Performance Improvement of a Vertical Plate Indirect Evaporative Cooler with Baffles," Energies, MDPI, vol. 17(10), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:10:p:2315-:d:1392396
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    References listed on IDEAS

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