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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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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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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Updated: Sep 19, 2025

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Highly Efficient Cooling via Synergistic Electro-Thermal Phase Changes.

Guangfa Wang1, Peijia Bai2, Shaoheng Yuan1

  • 1School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tongyan Road 38, Tianjin, 300350, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 17, 2025
PubMed
Summary
This summary is machine-generated.

Electro-phase change materials (electro-PCM) were enhanced by combining them with thermo-phase change materials (thermo-PCM) to improve cooling capacity. This synergistic approach significantly boosts entropy change and thermal conductivity for better electronic device cooling.

Keywords:
electrocaloric effectentropy change polymerphase change materialsolid‐state cooling

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Solid-state Physics

Background:

  • Electrocaloric materials (electro-PCM) offer eco-friendly, low-energy, and miniaturized cooling solutions.
  • Limited entropy change and thermal conductivity restrict the cooling capacity of electro-PCM devices for electronics.

Purpose of the Study:

  • To enhance the cooling performance of electro-PCM by synergistically combining electro-thermal phase changes.
  • To improve the entropy change and thermal conductivity of electro-PCM through stacking with thermo-PCM.

Main Methods:

  • Development of electro-thermal phase change materials (ETPCM) by stacking electro-PCM with thermo-PCM.
  • Characterization of entropy change and thermal conductivity of the ETPCM stack.
  • Validation of the cooling performance using a simulated electronic chip and an electrostatic actuation prototype.

Main Results:

  • The ETPCM stack demonstrated a 4.68-fold increase in entropy change (up to 132.35 J kg-1 K-1) and a 2.39-fold increase in thermal conductivity (up to 0.43 W m-1·K-1) compared to electro-PCM.
  • A cooling device based on the ETPCM stack achieved a temperature drop of 49.32 K for a simulated electronic chip (1.75 W cm-2).

Conclusions:

  • Synergistic electro-thermal phase changes significantly enhance entropy change and thermal conductivity in electro-PCM.
  • The developed ETPCM stack shows practical viability for efficient electronic cooling applications.
  • This interdisciplinary fusion approach opens new avenues for advanced electrocaloric cooling technologies.