Design, optimization and operation of a high power thermomagnetic harvester

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

Applied Energy, 2024, vol. 376, issue PB, No S0306261924016878

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.

Keywords: Thermomagnetic; Magnetothermal; Harvester; Optimization; Power (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.124304

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