Continuous and efficient elastocaloric air cooling by coil-bending

Xueshi Li, Peng Hua () and Qingping Sun ()
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Xueshi Li: The Hong Kong University of Science and Technology, Kowloon
Peng Hua: The Hong Kong University of Science and Technology, Kowloon
Qingping Sun: The Hong Kong University of Science and Technology, Kowloon

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Elastocaloric cooling has emerged as an eco-friendly technology capable of eliminating greenhouse-gas refrigerants. However, its development is limited by the large driving force and low efficiency in uniaxial loading modes. Here, we present a low-force and energy-efficient elastocaloric air cooling approach based on coil-bending of NiTi ribbons/wires. Our air cooler achieves continuous cold outlet air with a temperature drop of 10.6 K and a specific cooling power of 2.5 W g−1 at a low specific driving force of 26 N g−1. Notably, the cooler shows a system coefficient of performance of 3.7 (ratio of cooling power to rotational mechanical power). These values are realized by the large specific heat transfer area (12.6 cm2 g−1) and the constant cold zone of NiTi wires. Our coil-bending system exhibits a competitive performance among caloric air coolers.

Date: 2023
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DOI: 10.1038/s41467-023-43611-6

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