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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

1.1K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Absorption of Radiation01:05

Absorption of Radiation

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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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Mechanism of heat transfer01:19

Mechanism of heat transfer

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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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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

1.2K
There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Radiation Pressure: Problem Solving01:09

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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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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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Radiative cooling: arising from practice and in turn serving practice.

Quan Zhang1, Zhonghao Rao1, Rujun Ma2

  • 1Hebei Engineering Research Center of Advanced Energy Storage Technology and Equipment, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
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Summary
This summary is machine-generated.

Radiative cooling offers a renewable solution to global warming. This study reviews its history and proposes a path forward, emphasizing how practical applications drive research and how research can better serve practical needs.

Keywords:
net zero-energy consumptionpracticalityradiative coolingsustainable developmentthermal photonics

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Sustainable Energy

Background:

  • Growing global warming necessitates renewable cooling technologies.
  • Radiative cooling is a promising renewable cooling approach.
  • Translating laboratory advancements in radiative cooling to practical applications faces significant challenges.

Purpose of the Study:

  • To review the historical development of radiative cooling research.
  • To propose a developmental framework where practical needs drive research and research outcomes serve practical applications.
  • To stimulate discussion on improving the practical implementation of radiative cooling.

Main Methods:

  • Historical review of radiative cooling studies.
  • Theoretical analysis of fundamental limits.
  • Discussion of spectral-selective material realization.
  • Evaluation of cooling performance criteria.
  • Identification of practical challenges and potential solutions.

Main Results:

  • Radiative cooling research evolves from practical needs and ultimately aims to serve them.
  • Understanding theoretical limits is crucial for material design.
  • Practical performance metrics and real-world challenges require focused attention.
  • Solutions for practical implementation are being developed.

Conclusions:

  • Radiative cooling technology development should be guided by practical application needs.
  • Further research is needed to bridge the gap between laboratory potential and real-world deployment.
  • A feedback loop between practice and research is essential for advancing radiative cooling.