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

Bruederlin, F; Ossmer, H; Wendler, F; Miyazaki, S; Kohl, M

Abstract:
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 efficie ... mehr


Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 0022-3727, 1361-6463, 0262-8171, 0508-3443
KITopen ID: 1000074377
HGF-Programm 43.22.01; LK 01
Erschienen in Journal of physics / D
Band 50
Heft 42
Seiten Art.Nr. 424003
URLs Volltext
Schlagworte elastocaloric refrigeration, elastocaloric effect, shape memory alloy, pseudoelasticity
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