Journal
ACTA MATERIALIA
Volume 217, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.117162
Keywords
Elastocaloric; Phase change; Entropy; Debye approximation; Thermal properties
Funding
- Advanced Manufacturing Office
- Building Technologies Office of the Office of Energy Efficiency and Renewable Energy of the United States Department of Energy
- U.S. Department of Energy by Iowa State University of Science and Technology [DE-AC02-07CH11358]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil [001]
- CNPq -Conselho Nacional de Desenvolvimento Cientifico e Tecnologico -Brazil
- FAPERJ -Fundacao de Amparo aPesquisa do Estado do Rio de Janeiro
Ask authors/readers for more resources
Accurately modeling the thermal behaviors of materials with strong elastocaloric effects is crucial, and a physics-based approach has been used successfully. This approach provides insight into the thermal properties of elastocaloric materials and aids in rapid evaluation for efficient design of regenerative elastocaloric cooling devices.
A critical need to accurately model thermal behaviors of materials that exhibit strong elastocaloric effects, including predicting the effects themselves at varying stresses and temperatures, has been addressed using a simple and versatile physics-based approach. The key factor leading to the high precision is approximating the underlying elastic phase transition as a smooth modification of lattice entropy between coexisting phases. Once the phase transformation entropy is modeled to match experimentally measured strain as a function of temperature and applied stress, estimating the heat capacity, entropy, and isothermal entropy and adiabatic temperature changes in temperature-stress coordinates becomes straightforward. This approach provides insight into how thermal properties of elastocaloric materials vary through the transition based on strain measurements that are simple to perform and interpret. In addition to aiding in the rapid evaluation of new and existing elastocaloric materials, this advance is expected to prove invaluable for accurate heat transfer modeling aimed at designing efficient regenerative elastocaloric cooling devices. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available