On the influence of thermal hysteresis on the performance of thermomagnetic motors

Author(s)

Bessa, C. V. X. ^[1] ; Ferreira, L. D. R. ^[1] ; Horikawa, O. ^[1] ; Monteiro, J. C. B. ^[2] ; Gandra, F. G. ^[2] ; Gama, S. ^[3]

Affiliation

^[1] Univ Sao Paulo, Escola Politecn, EPUSP, BR-05508010 Sao Paulo - Brazil

^[2] Univ Estadual Campinas, UNICAMP, IFGW, BR-13083970 Campinas, SP - Brazil

^[3] Univ Fed Sao Paulo, UNIFESP, BR-09910720 Diadema, SP - Brazil

• Document type: Journal article
• Source: Journal of Applied Physics; v. 122, n. 24 DEC 28 2017.
• Web of Science Citations: 5

Abstract

Although thermal hysteresis might be a problem in the magnetocaloric refrigeration, the same is not necessarily true for thermomagnetic motor applications. This work presents a comparison of the magnetocaloric properties of materials with first order magnetic transition (having large or narrow thermal hysteresis) to those with second order magnetic transition, assessing the application of these materials in thermomagnetic motors through a thermodynamic approach. Results show that the larger the thermal hysteresis, the higher the specific work produced in a thermal cycle. This allows operation at higher temperature differences with high efficiency relative to Carnot efficiency, when compared with systems using narrow hysteresis and second order transition materials. Published by AIP Publishing. (AU)

• FAPESP's process: 15/26799-0 - Development of Tesla type Thermomagnetic Motors Driven by Solar Energy or by Industrial Thermal Rejects - Part III
• Grantee: Sergio Gama
• Support Opportunities: Regular Research Grants