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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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A compact elastocaloric refrigerator.

Yanliang Chen1, Yao Wang1, Wen Sun2

  • 1Department of Refrigeration and Cryogenic Engineering, Xi'an Jiaotong University, Xi'an, Shanxi 710049, China.

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|February 11, 2022
PubMed
Summary
This summary is machine-generated.

Elastocaloric cooling offers a promising alternative to traditional refrigeration. This study introduces a novel elastocaloric refrigerator design that significantly improves the actuator-to-refrigerant mass ratio, enhancing efficiency.

Keywords:
Nitinolelastocaloric coolingnot-in-kind coolingshape-memory alloyssuper-elastic alloys

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Mechanical Engineering

Background:

  • Elastocaloric cooling is an emerging solid-state cooling technology.
  • Conventional vapor compression systems face environmental and efficiency challenges.
  • Existing elastocaloric prototypes suffer from a high actuator-to-refrigerant mass ratio.

Purpose of the Study:

  • To design and demonstrate a novel elastocaloric refrigerator prototype.
  • To overcome the mass ratio bottleneck in current elastocaloric cooling systems.
  • To improve the efficiency and practicality of elastocaloric cooling technology.

Main Methods:

  • A single-actuator design with an inclined angle was developed.
  • Nickel-titanium (NiTi) shape-memory alloy wires were used as the solid-state refrigerant.
  • The actuator generates tensile force and lateral motion for efficient heat transfer.

Main Results:

  • Achieved a 90% improvement in the refrigerant-to-actuator mass ratio.
  • Demonstrated an adiabatic temperature change of 6.6 K in NiTi wires at 4.8% strain.
  • Obtained a 9.2 K temperature span and 3.1 W cooling power.

Conclusions:

  • The proposed design significantly enhances the mass ratio for elastocaloric cooling.
  • The developed prototype shows potential for practical elastocaloric refrigeration applications.
  • Further optimization using thinner NiTi materials could accelerate technology adoption.