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Design, optimization and operation of a high power thermomagnetic harvester

Author

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  • Bahl, Christian R.H.
  • Engelbrecht, Kurt
  • Gideon, Arendse
  • Levy, Mikael Alexander Vinogradov
  • Marcussen, Jacob Birkjær
  • Imbaquingo, Carlos
  • Bjørk, Rasmus

Abstract

Converting low temperature waste heat to electricity is vital for the green transition. Here we present how to design and optimize a thermomagnetic energy harvester that can convert a stream of waste heat to electricity through Faradays law. In optimizing the design in the traditional figure-of-eight shape, we determine the ideal size of the magnet and the beds of magnetic material using a numerical model given an overall volume constraint for each of the thermomagnetic volumes of 20 cm3. The magnet is determined to ideally be 5×5×1.25 cm, the beds should have a height of 1.09 cm and contain about 120 g of Gd spheres, and we use coils with a wire diameter of 1.8 mm and 156 windings in each coil. Following the design study, the system is realized using off-the-shelf components and tested as a function of flow rate, frequency of operation and temperature span. At a temperature span of 40 °C and a hot side temperature of 40 °C, the device produces 9 mW of power at a flow rate of 1.4 L/min.

Suggested Citation

  • Bahl, Christian R.H. & Engelbrecht, Kurt & Gideon, Arendse & Levy, Mikael Alexander Vinogradov & Marcussen, Jacob Birkjær & Imbaquingo, Carlos & Bjørk, Rasmus, 2024. "Design, optimization and operation of a high power thermomagnetic harvester," Applied Energy, Elsevier, vol. 376(PB).
    • Handle: RePEc:eee:appene:v:376:y:2024:i:pb:s0306261924016878
    DOI: 10.1016/j.apenergy.2024.124304
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    References listed on IDEAS

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    1. Lund, Rasmus & Persson, Urban, 2016. "Mapping of potential heat sources for heat pumps for district heating in Denmark," Energy, Elsevier, vol. 110(C), pages 129-138.
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    3. Anja Waske & Daniel Dzekan & Kai Sellschopp & Dietmar Berger & Alexander Stork & Kornelius Nielsch & Sebastian Fähler, 2019. "Energy harvesting near room temperature using a thermomagnetic generator with a pretzel-like magnetic flux topology," Nature Energy, Nature, vol. 4(1), pages 68-74, January.
    4. Jiang, Chao & Zhu, Shunmin & Yu, Guoyao & Luo, Ercang & Li, Ke, 2022. "Numerical and experimental investigations on a regenerative static thermomagnetic generator for low-grade thermal energy recovery," Applied Energy, Elsevier, vol. 311(C).
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