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Improvement of Heat Transfer Correlation for Fluoroplastic Steel Heat Exchanger and Theoretical Analysis of Application Characteristics

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  • Kai Li

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
    Jiaxing New Jies Thermal Power Co., Ltd., Jiaxing 314016, China)

  • Zhihao Meng

    (Jiaxing New Jies Thermal Power Co., Ltd., Jiaxing 314016, China)

  • Hong Feng

    (Jiaxing New Jies Thermal Power Co., Ltd., Jiaxing 314016, China)

  • Yihong Wang

    (Jiaxing New Jies Thermal Power Co., Ltd., Jiaxing 314016, China)

  • Qi Wang

    (Jiaxing New Jies Thermal Power Co., Ltd., Jiaxing 314016, China)

  • Xiang Gao

    (College of Energy Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Due to its good corrosion resistance and high rigidity, fluoroplastic steel heat exchangers have become one of the main feasible solutions to the problem of flue gas waste heat recovery. Therefore, a heat transfer performance test of a fluoroplastic steel heat exchanger was carried out, and a new heat transfer correlation (Nu = 0.11Re 0.72 Pr 0.36 , 1900 < Re < 4100, Pr ≈ 0.8) of a fluid transverse tube bank suitable for smooth fluoroplastic surfaces was proposed. Comparing the results of the proposed correlation and the Zhukauskas correlation, the calculation discrepancy was decreased when using the proposed correlation, and the average discrepancy dropped from 16.8% to 3.3%. As the thickness of the fluoroplastic film was reduced, the gap between the two correlations widened. Thus, the Zhukauskas correlation was not applicable to fluoroplastic steel heat exchangers with a thin fluoroplastic film. However, the deviation between the two correlations decreased as the condensing heat transfer area increased. For the fluoroplastic steel heat exchanger with a large condensation heat transfer area, the Zhukauskas correlation could still be utilized. It was interesting to observe that the deviation between the two correlations was reduced when only flue gas condensation was present, but it showed an increasing trend with the increase in condensation intensity.

Suggested Citation

  • Kai Li & Zhihao Meng & Hong Feng & Yihong Wang & Qi Wang & Xiang Gao, 2024. "Improvement of Heat Transfer Correlation for Fluoroplastic Steel Heat Exchanger and Theoretical Analysis of Application Characteristics," Energies, MDPI, vol. 17(20), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:20:p:5054-:d:1496489
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    References listed on IDEAS

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    2. Yan, Min & Zhang, Liang & Shi, Yuetao & Zhang, Liqiang & Li, Yuzhong & Ma, Chunyuan, 2018. "A novel boiler cold-end optimisation system based on bypass flue in coal-fired power plants: Heat recovery from wet flue gas," Energy, Elsevier, vol. 152(C), pages 84-94.
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