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Erschienen in: Shape Memory and Superelasticity 4/2019

09.12.2019 | SMST2019

Novel Experimental Approach to Determine Elastocaloric Latent Heat

verfasst von: Nicolas Michaelis, Andreas Schütze, Felix Welsch, Susanne-Marie Kirsch, Stefan Seelecke

Erschienen in: Shape Memory and Superelasticity | Ausgabe 4/2019

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Abstract

One of the most important parameters of superelastic shape memory alloys to be used in elastocaloric cooling and heating processes is their specific latent heat. Usually, the latent heat of a material is determined by differential scanning calorimetry (DSC) where the material phase transformation is induced thermally under zero stress. During elastocaloric processes however, the latent heat becomes accessible by stress-induced transformation under tensile or compression loading and unloading of the sample. In recent elastocaloric experiments, we observed drastic differences between latent heat values determined in DSC experiments and the ΔT values observed in nearly adiabatic elastocaloric cycles, which reflect the latent heat; in fact, the DSC experiments predicted rather pessimistic values and thus poor cooling performance. Based on these observations we developed and tested a novel experimental approach to determine the latent heat of superelastic materials directly during the elastocaloric process. By comparing or combining direct Joule heating with the strain based process we are able to accurately determine the latent heat for both tensile loading and unloading for any elastocaloric heating or cooling process. Furthermore, the influence of applied mechanical parameters as well as material conditioning on the latent heat can be observed in the elastocaloric experiment.
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Metadaten
Titel
Novel Experimental Approach to Determine Elastocaloric Latent Heat
verfasst von
Nicolas Michaelis
Andreas Schütze
Felix Welsch
Susanne-Marie Kirsch
Stefan Seelecke
Publikationsdatum
09.12.2019
Verlag
Springer US
Erschienen in
Shape Memory and Superelasticity / Ausgabe 4/2019
Print ISSN: 2199-384X
Elektronische ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-019-00249-y

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