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Title: Linear Thermomagnetic Energy Harvester for Low-Grade Thermal Energy Harvesting

Abstract

Low-grade thermal energy, either from waste heat or from natural resources, constitutes an enormous energy reserve that remains to be fully harvested. Harvesting low-grade heat is challenging because of the low Carnot efficiency. Among various thermal energy harvesting mechanisms available for capturing low-grade heat (temperature less than 100 degrees C), the thermomagnetic effect has been found to be quite promising. In this study, we demonstrate a scalable thermomagnetic energy harvester architecture that exhibits 140% higher power density compared to the previously published spring-mass designs. The alternating force required to oscillate the thermomagnetic mass is generated through the interaction between two magnetic forces in opposite directions. We employed numerical modeling to illustrate the behavior of a thermomagnetic device under different operating conditions and to obtain the optimal hot-side and cold-side temperatures for continuous mode operations. A miniaturized thermomagnetic harvester was fabricated and experiments were conducted to systematically evaluate the performance. The prototype was found to exhibit an oscillation frequency of 0.33 Hz, a work output of 0.6 J/kg/cycle, and a power density of 0.2 W/kg of gadolinium under the temperature difference of 60 K.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [3]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Virginia Tech
  3. Virginia Tech; Pennsylvania State University
  4. Restone Arsenal
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1598972
Report Number(s):
NREL/JA-5500-76025
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 127; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; magnetic materials; numerical methods; electromagnetism; thermomagnetic effects; energy harvester; thermoelectricity; phase transitions; ferromagnetic materials; mechanical energy; magnetic fields

Citation Formats

Kishore, Ravi A, Singh, Deepa, Sriramdas, Rammohan, Garcia, Anthony Jon, Sanghadasa, Mohan, and Priya, Shashank. Linear Thermomagnetic Energy Harvester for Low-Grade Thermal Energy Harvesting. United States: N. p., 2020. Web. doi:10.1063/1.5124312.
Kishore, Ravi A, Singh, Deepa, Sriramdas, Rammohan, Garcia, Anthony Jon, Sanghadasa, Mohan, & Priya, Shashank. Linear Thermomagnetic Energy Harvester for Low-Grade Thermal Energy Harvesting. United States. doi:10.1063/1.5124312.
Kishore, Ravi A, Singh, Deepa, Sriramdas, Rammohan, Garcia, Anthony Jon, Sanghadasa, Mohan, and Priya, Shashank. Wed . "Linear Thermomagnetic Energy Harvester for Low-Grade Thermal Energy Harvesting". United States. doi:10.1063/1.5124312.
@article{osti_1598972,
title = {Linear Thermomagnetic Energy Harvester for Low-Grade Thermal Energy Harvesting},
author = {Kishore, Ravi A and Singh, Deepa and Sriramdas, Rammohan and Garcia, Anthony Jon and Sanghadasa, Mohan and Priya, Shashank},
abstractNote = {Low-grade thermal energy, either from waste heat or from natural resources, constitutes an enormous energy reserve that remains to be fully harvested. Harvesting low-grade heat is challenging because of the low Carnot efficiency. Among various thermal energy harvesting mechanisms available for capturing low-grade heat (temperature less than 100 degrees C), the thermomagnetic effect has been found to be quite promising. In this study, we demonstrate a scalable thermomagnetic energy harvester architecture that exhibits 140% higher power density compared to the previously published spring-mass designs. The alternating force required to oscillate the thermomagnetic mass is generated through the interaction between two magnetic forces in opposite directions. We employed numerical modeling to illustrate the behavior of a thermomagnetic device under different operating conditions and to obtain the optimal hot-side and cold-side temperatures for continuous mode operations. A miniaturized thermomagnetic harvester was fabricated and experiments were conducted to systematically evaluate the performance. The prototype was found to exhibit an oscillation frequency of 0.33 Hz, a work output of 0.6 J/kg/cycle, and a power density of 0.2 W/kg of gadolinium under the temperature difference of 60 K.},
doi = {10.1063/1.5124312},
journal = {Journal of Applied Physics},
number = 4,
volume = 127,
place = {United States},
year = {2020},
month = {1}
}

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