Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
EXPERIMENTAL INVESTIGATION ABOUT EDISON TYPE THERMOMAGNETIC MOTORS BEHAVIOR OPERATING WITH A SMALL TEMPERATURE GRADIENT
Submission Author:
Carlos Vinicius Xavier Bessa , SP
Co-Authors:
Carlos Vinicius Xavier Bessa, João de Sá Brasil Lima, Bruno Chieregatti, Ricardo Galdino, Lucas Diego Rodrigues Ferreira
Presenter: Carlos Vinicius Xavier Bessa
doi://10.26678/ABCM.COBEM2021.COB2021-1222
Abstract
Thermomagnetic motors are thermal engines that present the potential to obtain mechanical power from a small temperature gradient, with a high efficiency related with the Carnot efficiency. These devices are a promising technology for heat waste recovery and energy harvesting from vertical ocean temperature gradients, geothermal and solar sources. This study presents an experimental approach to investigate an Edison-type thermomagnetic motor operating around room temperature. The studied thermomagnetic motor uses pure gadolinium as a thermomagnetic rotor. A magnetic circuit using a NdFeB permanent magnet provides the applied magnetic field from 0 up to 0.85 T. The prototype relationships between output mechanical power and shaft angular velocity were obtained for heat sink and source temperatures from 283 K to 308 K and the different torque applied to the motor shaft conditions. The highest angular velocity, 0.8 rad/s, was found for the heat sink at 288 K and the heat source at 308 K with no torque applied to the motor shaft. The highest output mechanical power, 12 mW, was obtained for the same temperature condition with a motor's shaft applied torque of 0.02 N.m. The results show that these devices can produce mechanical power from temperature gradients lower than 10 K. The prototype developed in this study can contribute to a greater theoretical understanding of thermomagnetic motors in general, which could be a relevant energy harvesting device in diverse applications in the near future.
Keywords
Thermomagnetic motors, energy harvesting, heat waste recovery
