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Heat transfer evaluation of an enhanced heat transfer tube bundle

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  • Kukulka, David J.
  • Smith, Rick

Abstract

Demands to increase performance of modern heat exchange systems are constantly being made. Typical requirements include the removal of larger amounts of energy or the development of process units that occupy a smaller unit footprint. Vipertex™ 1EHT enhanced surfaces have been designed and produced through material surface modifications in order to create flow optimized heat transfer tubes which increase heat transfer with only a modest increase in the friction factor. Considerations in the development of the enhanced, three dimensional 1EHT enhanced heat transfer surfaces include: maximization of heat transfer; minimization of operating costs; and/or a minimization of the rate of surface fouling. This study details the performance of a horizontal oriented 1EHT enhanced surface tube bundle and compares heat transfer results to a horizontal bundle of smooth tubes for single phase and two phase conditions. Results for the 1EHT bundle show an increase in the overall heat transfer coefficient up to 200% when compared to the heat transfer performance of a smooth tube bundle using typical fluids (n-Pentane, p-Xylene and water); for midpoint shellside Reynolds number values in the range of 2010–20,400; with effective mean temperature difference (EMTD) values between 8.6 °C and 65.7 °C. More nucleation sites are produced on the 1EHT tube surface than on an equivalent length of unenhanced commercial tube. Results from this bundle study indicate that the 1EHT enhanced tube surface is well suited for applications where nucleate boiling is significant. Enhanced heat transfer tube bundles using the 1EHT tubes are capable of producing efficiency increases making 1EHT tubes an important alternative to be considered in the design of high efficiency processes. Vipertex 1EHT tube bundles recover more energy and provide an opportunity to advance the design of many heat transfer products.

Suggested Citation

  • Kukulka, David J. & Smith, Rick, 2014. "Heat transfer evaluation of an enhanced heat transfer tube bundle," Energy, Elsevier, vol. 75(C), pages 97-103.
    • Handle: RePEc:eee:energy:v:75:y:2014:i:c:p:97-103
    DOI: 10.1016/j.energy.2014.04.113
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    References listed on IDEAS

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    1. Daróczy, László & Janiga, Gábor & Thévenin, Dominique, 2014. "Systematic analysis of the heat exchanger arrangement problem using multi-objective genetic optimization," Energy, Elsevier, vol. 65(C), pages 364-373.
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    Cited by:

    1. Wang, Yiping & Fu, Hailing & Huang, Qunwu & Cui, Yong & Sun, Yong & Jiang, Lihong, 2015. "Experimental study of direct contact vaporization heat transfer on n-pentane-water flowing interface," Energy, Elsevier, vol. 93(P1), pages 854-863.

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