Power Generation from a Hybrid Generator (TENG-EMG) Run by a Thermomagnetic Engine Harnessing Low Temperature Waste Heat

Zeeshan, Rahate Ahmed, Wongee Chun, Seung Jin Oh and Yeongmin Kim
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Zeeshan: Department of Nuclear and Energy Engineering, Jeju National University, Jeju 63243, Korea
Rahate Ahmed: Department of Nuclear and Energy Engineering, Jeju National University, Jeju 63243, Korea
Wongee Chun: Department of Nuclear and Energy Engineering, Jeju National University, Jeju 63243, Korea
Seung Jin Oh: Clean Innovation Technology Group, Korea Institute of Industrial Technology, Jeju 63243, Korea
Yeongmin Kim: Department of Nuclear and Energy Engineering, Jeju National University, Jeju 63243, Korea

Energies, 2019, vol. 12, issue 9, 1-13

Abstract: This work explored the scavenging of low temperature waste heat and conversion of it into electrical energy through the operation of a gadolinium (Gd) based thermomagnetic engine. Gd is one of the unique materials whose magnetic property changes from ferromagnetic to paramagnetic depending on the temperature (“the Curie temperature”), which is around 20 °C. In the present work, two different types of generators were designed and applied to the rotating shaft of a Gd-based thermomagnetic engine developed for low temperature differential (LTD) applications. Of these, one is the so-called triboelectric nanogenerator (TENG), and the other is the electromagnetic generator (EMG). These have been designed to produce electricity from the rotating shaft of the thermomagnetic engine, exploiting both the electromagnetic and triboelectric effects. When operated at a rotational speed of 251 rpm with a temperature difference of 45 °C between the hot and cold water jets, the hybrid (TENG-EMG) generator produced a combined pulsating DC open circuit voltage of 5 V and a short circuit current of 0.7 mA. The hybrid generator effectively produced a maximum output power of 0.75 mW at a loading resistance of 10 kΩ.

Keywords: thermomagnetic engine; triboelectric nanogenerator (TENG); electromagnetic generator (EMG); triboelectric effect; electromagnetic effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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