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Development of Heat Transfer Surface Area Enhancements: A Test Facility for New Heat Exchanger Designs

Author

Listed:
  • Hannes Fugmann

    (Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany)

  • Paolo Di Lauro

    (Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany)

  • Aniket Sawant

    (Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany)

  • Lena Schnabel

    (Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany)

Abstract

Enhancing the heat transfer surface by usage of cellular metal structures, such as foams or wire structures, might allow enlarging the surface area, increasing the heat transfer coefficients, decreasing the material utilization, and enabling the flexibility of different geometrical dimensions. However their manufacturing and assembling in a large heat exchanger for performance testing and optimizing can be costly. Therefore a test rig was constructed for experimental characterization of heat transfer surface area enhancements. Heat exchanger samples with dimensions in the centimeter range can be measured. The fluid flow and heat transfer features of a micro pin fin wire structure made from copper by soft-soldering were experimentally characterized under steady-state forced air convection. The results are compared to performance characteristics of louvered fins. Heat transfer coefficients of the pin fins are twice as high as for the louvered fins. The relative expanded uncertainty of the Nusselt number is ±7%.

Suggested Citation

  • Hannes Fugmann & Paolo Di Lauro & Aniket Sawant & Lena Schnabel, 2018. "Development of Heat Transfer Surface Area Enhancements: A Test Facility for New Heat Exchanger Designs," Energies, MDPI, vol. 11(5), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1322-:d:148421
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    References listed on IDEAS

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    1. Hannes Fugmann & Eric Laurenz & Lena Schnabel, 2017. "Wire Structure Heat Exchangers—New Designs for Efficient Heat Transfer," Energies, MDPI, vol. 10(9), pages 1-17, September.
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    Cited by:

    1. Hannes Fugmann & Eric Laurenz & Lena Schnabel, 2019. "Multi-Dimensional Performance Evaluation of Heat Exchanger Surface Enhancements," Energies, MDPI, vol. 12(7), pages 1-22, April.
    2. Hannes Fugmann & Sebastian Martens & Richard Balzer & Martin Brenner & Lena Schnabel & Carsten Mehring, 2020. "Performance Evaluation of Wire Cloth Micro Heat Exchangers," Energies, MDPI, vol. 13(3), pages 1-16, February.
    3. Seungjin Lee & Yoon Seok Kim & Joong Yull Park, 2018. "Numerical Investigation on the Effects of Baffles with Various Thermal and Geometrical Conditions on Thermo-Fluid Dynamics and Kinetic Power of a Solar Updraft Tower," Energies, MDPI, vol. 11(9), pages 1-14, August.

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    2. Hannes Fugmann & Sebastian Martens & Richard Balzer & Martin Brenner & Lena Schnabel & Carsten Mehring, 2020. "Performance Evaluation of Wire Cloth Micro Heat Exchangers," Energies, MDPI, vol. 13(3), pages 1-16, February.
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