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Related Concept Videos

Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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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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Giant temperature span in electrocaloric regenerator.

A Torelló1,2, P Lheritier3, T Usui4

  • 1Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), 41 Rue du Brill, Belvaux L-4422, Luxembourg. alvar.torello@list.lu emmanuel.defay@list.lu.

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Researchers developed a novel electrocaloric (EC) regenerator using lead scandium tantalate. This device achieved a 13.0 K temperature span, demonstrating the potential of EC materials for next-generation cooling technologies.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-state physics

Background:

  • Caloric materials offer a sustainable alternative to traditional cooling technologies.
  • Electrocaloric (EC) materials exhibit temperature changes in response to electric fields.
  • Existing EC cooling prototypes lack competitive temperature spans.

Purpose of the Study:

  • To develop and demonstrate a high-performance electrocaloric heat exchanger.
  • To achieve a significant temperature span for practical cooling applications.

Main Methods:

  • Fabrication of a parallel-plate active EC regenerator using lead scandium tantalate multilayer capacitors.
  • Optimization of the device structure using finite element modeling for improved insulation.
  • Experimental measurement of the temperature span under operating conditions.

Main Results:

  • A maximum temperature span of 13.0 Kelvin was achieved.
  • The developed EC regenerator demonstrates a competitive performance.
  • Structural optimization and improved insulation were critical for the enhanced temperature span.

Conclusions:

  • The developed EC regenerator breaks a crucial barrier in EC cooling performance.
  • Electrocaloric materials are confirmed as promising candidates for next-generation cooling devices.
  • This work validates the potential of EC technology for efficient and sustainable cooling solutions.