What is it about?

Elastocaloric refrigeration requires refrigerants with a good heat transfer ability and a high fatigue life. We show that to achieve a larger specific heat transfer area (SA), compression fatigue life of NiTi tubes monotonically decreases because of the decrease in the wall-thickness, while the layer-type NiTi refrigerant maintains a high fatigue life at a high SA level.

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Why is it important?

Existing compression-based NiTi elastocaloric prototypes only focus on tube refrigerants, and no research has been reported on the cross-sectional geometry design and its influence on the compression fatigue behavior of NiTi refrigerants. Our work provides an insight into enhancing elastocaloric refrigerants’ heat transfer ability and fatigue life via geometry design.


We suggest that geometry design of elastocaloric refrigerants should not only consider refrigerants’ specific heat transfer area for a good heat transfer ability, but it should also take into account the local stress distribution and the thickness of failure path for a high fatigue life.

Hong Kong University of Science and Technology

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This page is a summary of: Effect of cross-sectional geometry on the compression fatigue behavior of NiTi refrigerants, AIP Advances, July 2022, American Institute of Physics, DOI: 10.1063/5.0098696.
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