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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
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High-performance cooling and heat pumping based on fatigue-resistant elastocaloric effect in compression.

Žiga Ahčin1, Stefano Dall'Olio1, Andrej Žerovnik1

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|October 31, 2022
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Summary

A novel shell-and-tube-like elastocaloric regenerator design offers durable operation and record performance for cooling and heat-pumping applications. This breakthrough surpasses existing caloric technologies, paving the way for efficient elastocaloric devices.

Keywords:
Ni–Ticaloric coolingcompressive loadingefficiencyelastocaloric effectfatigueshape-memory alloystubes

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Mechanical Engineering

Background:

  • Elastocaloric cooling presents a promising alternative to traditional vapor-compression refrigeration.
  • Current elastocaloric devices lack both fatigue resistance and high cooling performance.

Purpose of the Study:

  • To introduce a new elastocaloric regenerator design for enhanced durability and performance.
  • To demonstrate the potential of compression-loaded elastocaloric regenerators.

Main Methods:

  • Development of a shell-and-tube-like elastocaloric regenerator utilizing compression-loaded Ni-Ti tubes.
  • Testing the regenerator's performance in both cooling and heat-pumping modes.

Main Results:

  • Achieved a maximum temperature span of 31.3 K in heat-pumping mode.
  • Demonstrated maximum heating/cooling powers exceeding 60 W (4,400 W/kg).
  • Performance metrics surpass all previously developed caloric devices.

Conclusions:

  • The novel regenerator design enables durable operation with record-breaking elastocaloric performance.
  • Compression-loaded elastocaloric regenerators show significant potential for diverse cooling and heat-pumping applications.