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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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Alto rendimiento de refrigeración en una bomba de calor electrocalórica de doble bucle

Junning Li1, Alvar Torelló1, Veronika Kovacova1

  • 1Materials Research and Technology Department, Luxembourg Institute of Science and Technology, Belvaux L-4422, Luxembourg.

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Resumen
Este resumen es generado por máquina.

El enfriamiento electrocalórico en estado sólido ofrece una alternativa prometedora a la compresión de vapor tradicional. Este estudio demuestra un nuevo refrigerador electrocalórico con una potencia y eficiencia de refrigeración significativas, mostrando su potencial comercial.

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Área de la Ciencia:

  • La termodinámica
  • Ciencias de los materiales
  • Física del estado sólido

Sus antecedentes:

  • Los sistemas de refrigeración por compresión de vapor consumen mucha energía y se basan en refrigerantes que afectan al medio ambiente.
  • Los materiales electrocalóricos en estado sólido (EC) ofrecen una alternativa potencial para un enfriamiento eficiente y sostenible.
  • Los dispositivos de refrigeración de la CE anteriores se han enfrentado a desafíos para lograr un rendimiento comercialmente competitivo.

Objetivo del estudio:

  • Desarrollar y demostrar un enfriador electrocalórico de alto rendimiento.
  • Para evaluar la potencia de refrigeración, el rango de temperatura y la eficiencia del dispositivo CE.
  • Evaluar la viabilidad del enfriamiento CE como sustituto de la tecnología de compresión de vapor.

Principales métodos:

  • Fabricación de un enfriador electrocalórico utilizando materiales avanzados de estado sólido.
  • Pruebas experimentales bajo campos eléctricos aplicados moderados (10 V/μm).
  • Medición del rango de temperatura, la potencia de refrigeración y el coeficiente de rendimiento (COP).

Principales resultados:

  • Ha alcanzado una temperatura máxima de 20.9 Kelvin.
  • Se ha demostrado una potencia de refrigeración máxima de 4,2 vatios.
  • Alcanzó un COP máximo del 64% de la eficiencia Carnot, teniendo en cuenta la recuperación de energía y el bombeo de fluidos.

Conclusiones:

  • El refrigerador electrocalórico desarrollado muestra un potencial significativo para la competitividad comercial.
  • El enfriamiento electrocalórico es una alternativa viable y prometedora a los sistemas convencionales de compresión de vapor.
  • Una mayor investigación y desarrollo podría conducir a la adopción generalizada de la tecnología de refrigeración de la CE.