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Experimental Investigation of Large-Scale Vertically Coated Tubes for Enhanced Air–Steam Condensation Heat Transfer

Author

Listed:
  • Zengqiao Chen

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Keyuan Zhang

    (Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China)

  • Naihua Wang

    (Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China)

Abstract

Non-condensable gas plays a significant role in steam condensation, primarily by reducing heat transfer efficiency. Enhanced condensation heat transfer in the presence of non-condensable gas is crucial for improving thermal efficiency, reducing energy consumption, and lowering costs. However, experimental studies on applying coatings to enhance condensation heat transfer in large-scale vertical outer tubes with non-condensable gas are scarce. This study investigates the condensation heat transfer performance of vertical stainless steel- and brass-coated tubes compared to their bare counterparts at different air concentrations (0.4, 0.3, 0.15, and 0.08). All tubes have an outer diameter of 19 mm and an effective length of 1080 mm. Visualizations reveal that condensate flow rates as high as 0.5 m/s on bare tubes cause significant disturbances to the diffusion layer. At various air concentrations, the maximum condensation heat transfer coefficient of the coated stainless steel tube exhibited increases of 22.2%, 11.9%, 4.2%, and 19.6% compared with the uncoated stainless steel tube. Similarly, the maximum condensation heat transfer coefficient for the coated brass tube showed significant increases of 58.9%, 53.5%, 68.0%, and 70.7% compared with the uncoated brass tube. Notably, the enhancement effect on heat transfer performance is more pronounced when the same type of modified surface is applied to the brass tube compared with the stainless steel tube.

Suggested Citation

  • Zengqiao Chen & Keyuan Zhang & Naihua Wang, 2024. "Experimental Investigation of Large-Scale Vertically Coated Tubes for Enhanced Air–Steam Condensation Heat Transfer," Energies, MDPI, vol. 17(18), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:18:p:4759-:d:1483966
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    References listed on IDEAS

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    1. Galuppo, Francesco & Reiche, Thomas & Lemort, Vincent & Dufour, Pascal & Nadri, Madiha, 2021. "Organic Rankine Cycle based waste heat recovery modeling and control of the low pressure side using direct condensation and dedicated fans," Energy, Elsevier, vol. 216(C).
    2. Arsenyeva, Olga & Klemeš, Jiří Jaromír & Tovazhnyanskyy, Leonid & Klochok, Eugeny & Kapustenko, Petro, 2023. "Estimating parameters of plate heat exchanger for condensation of steam from mixture with air as a component of heat exchanger network," Energy, Elsevier, vol. 283(C).
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