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Related Concept Videos

Mechanisms of Heat Transfer II01:20

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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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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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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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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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Can Thermal Nonreciprocity Help Radiative Cooling?

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Nonreciprocal radiative cooling faces limitations due to Kirchhoff

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Area of Science:

  • Thermodynamics
  • Nanophotonics
  • Materials Science

Background:

  • Radiative cooling technology has advanced significantly.
  • Performance is limited by Kirchhoff's law of thermal radiation.
  • Nonreciprocal radiative cooling aims to overcome these limitations.

Purpose of the Study:

  • To analyze the practical limitations of nonreciprocal radiative cooling.
  • To discuss the impact of energy conservation and radiant flux integration.
  • To propose future research directions in radiative cooling.

Main Methods:

  • Theoretical analysis of radiative cooling principles.
  • Evaluation of nonreciprocal thermal radiation concepts.
  • Discussion of thermodynamic constraints.

Main Results:

  • The benefits of nonreciprocal radiative cooling are often insignificant due to fundamental physical laws.
  • Energy conservation and hemispherical radiant flux integration limit practical gains.
  • Kirchhoff's law remains a significant constraint.

Conclusions:

  • Nonreciprocal radiative cooling faces inherent limitations that diminish its practical advantages.
  • Future advancements may lie in directional radiative cooling strategies.
  • Further research is needed to explore alternative approaches beyond nonreciprocity.