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  • Thin-walled Ni-Ti tubes under compression [Elektronski vir] : ideal candidates for efficient and fatigue-resistant elastocaloric cooling
    Porenta, Luka, 1993- ...
    Elastocaloric cooling is emerging as one of the most promising alternatives to vapor-compression cooling technology. It is based on the elastocaloric effect (eCE) of shape memory alloys (SMAs), which ... occurs due to a stress-induced martensitic transformation (superelasticity). In recent years, several elastocaloric proof-of-concept devices have been developed and the best of them have already achieved commercially relevant cooling characteristics. However, the proposed devices are not yet ready for commercialization, mostly due to their short fatigue life, which is a consequence of the tensile loading. The fatigue life can be significantly improved if the material is instead subjected to compressive loading, but mechanical instabilities (buckling) and the poor heat transfer of bulky geometries (favorable for compression) are the major challenges to overcome when designing compressed elastocaloric elements. Here, we show for the first time that thin-walled Ni-Ti tubes, which allow for the rapid heat transfer, can withstand more than 10 [sup] 6 compressive loading cycles without any degradation of the eCE while maintaining high efficiency (coefficient of performance) and adiabatic temperature changes as high as 27 K. This is the largest, directly measured, durable eCE for any elastocaloric material in the high-cycle fatigue regime to date, and so opens up new avenues in the development of durable and efficient elastocaloric devices.
    Source: Applied materials today [Elektronski vir]. - ISSN 2352-9415 (Vol. 20, Sep. 2020, f. 1-9)
    Type of material - e-article
    Publish date - 2020
    Language - english
    COBISS.SI-ID - 18414339

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S235294072030158X
    Repository of the University of Ljubljana – RUL
    DOI

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