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Figure of merit and improved performance of a hybrid thermomagnetic oscillator

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  • Deepak, K.
  • Pattanaik, M.S.
  • Ramanujan, R.V.

Abstract

The figure of merit for energy harvesting of a thermomagnetic oscillator has been analyzed. For the first time, a figure of merit for a thermomagnetic device combining the material properties and device parameters has been established. Our analysis indicates that alloys with a sharp magnetic transition with respect to temperature and lower hysteresis exhibit higher figure of merit for a given set of heat load and heat sink temperatures. The material with the highest figure of merit, (MnNiSi)0.68(Fe2Ge)0.32, was employed to construct a thermomagnetic oscillator. A thermomagnetic alloy was coupled to a permanent magnet by a flexible spacer, one end of the flexible spacer was attached to the thermomagnetic alloy and the other to the permanent magnet. Use of a flexible spacer increases the oscillation frequency by 32% compared to a rigid spacer. The permanent magnet also exhibited damped oscillations, resulting in an increase voltage/cycle by 18% compared to the rigid spacer case. Thus, figure of merit is a suitable guideline for tuning the material properties and optimizing the device parameters for maximizing the performance of the thermomagnetic oscillator.

Suggested Citation

  • Deepak, K. & Pattanaik, M.S. & Ramanujan, R.V., 2019. "Figure of merit and improved performance of a hybrid thermomagnetic oscillator," Applied Energy, Elsevier, vol. 256(C).
    • Handle: RePEc:eee:appene:v:256:y:2019:i:c:s0306261919316046
    DOI: 10.1016/j.apenergy.2019.113917
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