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This study presents a kilowatt-scale elastocaloric cooling device using shape memory alloys (SMAs). The novel multi-cell architecture achieves high cooling power, offering a green alternative to conventional refrigeration.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Sustainable Energy

Background:

  • Elastocaloric cooling with shape memory alloys (SMAs) offers an eco-friendly and energy-efficient alternative to traditional refrigeration.
  • Current SMA-based cooling devices have limited cooling power (≤300 W), hindering commercial adoption.

Purpose of the Study:

  • To develop a kilowatt-scale elastocaloric cooling device with enhanced cooling power.
  • To demonstrate the commercial viability of SMA-based cooling technology.

Main Methods:

  • Constructed a novel 'SMAs in series-fluid in parallel' multi-cell architecture using compressive tubular NiTi.
  • Utilized thin-walled tubular NiTi for a high surface-area-to-volume ratio and high-frequency operation (3.5 Hz).
  • Employed graphene nanofluid as an efficient heat transfer agent.

Main Results:

  • Achieved a specific cooling power of 12.3 W/g.
  • Demonstrated a cooling power of 1,284 W at zero temperature lift.
  • Device maintained performance over 500,000 cycles.

Conclusions:

  • The developed multi-cell architecture and optimized material configuration enable kilowatt-scale elastocaloric cooling.
  • This technology shows significant potential as a sustainable and efficient cooling solution for a decarbonized future.