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Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers

Author

Listed:
  • Eloy Melian

    (Institute of Industrial Ecology, Pforzheim University of Applied Sciences, 75175 Pforzheim, Germany)

  • Harald Klein

    (Department of Mechanical Engineering, Technical University of Munich, 85748 München, Germany)

  • Nikolaus Thißen

    (Institute of Industrial Ecology, Pforzheim University of Applied Sciences, 75175 Pforzheim, Germany)

Abstract

In the last 50 years, the technology of rotary heat exchangers has not changed considerably. A reliable simulation can help improve the design of this technology. In this work, a simulation for rotary heat exchangers was developed and validated with multiple experimental data. This simulation takes an innovative approach based on locally calculated heat transfer coefficients and considers the entry region effect. This approach proved to be accurate since the average difference between the experimental results and the proposed model with a constant heat boundary condition is 0.1% and the maximum absolute deviation 1%. Experimental, as well as simulation results, indicate that lower empty tube gas velocity (1 m/s) and higher rotational speed (12 rpm) improve thermal efficiency compared to commonly used operating conditions. Additionally, a new model for predicting the local internal Nusselt number for sine ducts in the rotor channels is proposed, which considers the entry region effect.

Suggested Citation

  • Eloy Melian & Harald Klein & Nikolaus Thißen, 2020. "Improvement of a Nusselt-Based Simulation Model for Heat Transfer in Rotary Heat Exchangers," Energies, MDPI, vol. 14(1), pages 1-26, December.
    • Handle: RePEc:gam:jeners:v:14:y:2020:i:1:p:10-:d:466292
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    References listed on IDEAS

    as
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    4. Zeng, Cheng & Liu, Shuli & Shukla, Ashish, 2017. "A review on the air-to-air heat and mass exchanger technologies for building applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 75(C), pages 753-774.
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    Cited by:

    1. Piotr Michalak, 2021. "Annual Energy Performance of an Air Handling Unit with a Cross-Flow Heat Exchanger," Energies, MDPI, vol. 14(6), pages 1-16, March.

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