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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation.

Marvin Schmidt1, Johannes Ullrich2, André Wieczorek3

  • 1Lab for Measurement Technology, Saarland University; Intelligent Material Systems Lab, Saarland University.

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Summary

Shape Memory Alloys (SMAs) offer an eco-friendly cooling alternative. This study details a new test rig to investigate elastocaloric cooling effects in SMAs, paving the way for improved solid-state cooling technologies.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-State Physics

Background:

  • Conventional cooling systems rely on vapor compression, posing environmental concerns.
  • Shape Memory Alloys (SMAs), particularly Nickel-Titanium (Ni-Ti) systems, exhibit significant elastocaloric effects and latent heats crucial for solid-state cooling.
  • Elastocaloric cooling offers a promising, environmentally friendly alternative to traditional methods.

Purpose of the Study:

  • To design and validate a scientific test rig for investigating elastocaloric cooling processes and effects in SMAs.
  • To enable independent control of mechanical loading/unloading cycles and heat transfer in SMA elements.
  • To analyze the influence of material properties, process variations, and boundary conditions on cooling efficiency.

Main Methods:

  • Development of a specialized test rig with independent control over mechanical and thermal parameters.
  • Utilization of a high-performance infrared camera for synchronized measurement of mechanical and thermal data, including caloric aspects.
  • Experimental investigation of elastocaloric material properties across different materials and geometries.
  • Comparison of experimental results with simulations from a thermomechanically coupled finite element model.

Main Results:

  • The test rig successfully enabled detailed investigation of elastocaloric effects and cooling processes in SMAs.
  • Identified key factors influencing process efficiency, including localization and rate effects crucial for heat transfer.
  • Experimental data provided insights into the underlying physics of the elastocaloric effect when compared with simulation results.
  • Quantified elastocaloric material properties and cooling performance under various conditions.

Conclusions:

  • The developed test rig is effective for characterizing elastocaloric properties and optimizing solid-state cooling processes.
  • Findings contribute to a deeper understanding of the elastocaloric effect, enabling targeted improvements in SMA materials and cooling system designs.
  • Elastocaloric cooling using SMAs presents a viable, sustainable alternative for future cooling technologies.