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SMA foil-based elastocaloric cooling : from material behavior to device engineering

Bruederlin, F. 1; Ossmer, H. 1; Wendler, F.; Miyazaki, S.; Kohl, M. 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


The elastocaloric effect associated with the stress-induced first order phase transformation in pseudoelastic shape memory alloy (SMA) films and foils is of special interest for cooling applications on a miniature scale enabling fast heat transfer and high cycling frequencies as well as tunable transformation temperatures. The focus is on TiNi-based materials having the potential to meet the various challenges associated with elastocaloric cooling including large adiabatic temperature change and ultra-low fatigue. The evolution of strain and temperature bands during tensile load cycling is investigated with respect to strain and strain-rate by in situ digital image correlation and infrared thermography with a spatial resolution in the order of 25 µm. Major design issues and challenges in fabrication of SMA film-based elastocaloric cooling devices are discussed including the efficiency of heat transfer as well as force recovery to enhance the coefficient of performance (COP) on the system level. Advanced demonstrators show a temperature span of 13 °C after 30 s, while the COP of the overall device reaches almost 10% of Carnot efficiency.

DOI: 10.1088/1361-6463/aa87a2
Zitationen: 80
Web of Science
Zitationen: 72
Zitationen: 89
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 0022-3727, 1361-6463, 0262-8171, 0508-3443
KITopen-ID: 1000074377
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Journal of physics / D
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 50
Heft 42
Seiten Art.Nr. 424003
Externe Relationen Abstract/Volltext
Schlagwörter elastocaloric refrigeration, elastocaloric effect, shape memory alloy, pseudoelasticity
Nachgewiesen in Scopus
Web of Science
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