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Related Concept Videos

Radiation: Applications01:17

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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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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.
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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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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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Mechanisms of Heat Transfer I01:14

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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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Characterization of Thermal Transport in One-dimensional Solid Materials
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Characterization of radiative cooling materials.

Zhuning Wang1, Sijie Pian1, Yaoguang Ma2

  • 1State Key Laboratory for Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Intelligent Optics and Photonics Research Center, Jiaxing Research Institute, Zhejiang University, Hangzhou, China.

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Summary

This study introduces standardized procedures and testing platforms for evaluating radiative cooling materials. These methods enable consistent comparison of material performance for diverse applications.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Optics

Background:

  • Radiative cooling is a promising renewable energy technology.
  • Numerous radiative cooling materials exist, including fabrics, paints, and building materials.
  • A lack of standardized evaluation systems hinders material property comparison.

Purpose of the Study:

  • To present standardized procedures for assessing radiative cooling material properties.
  • To detail the construction and use of outdoor and indoor performance-testing platforms.
  • To enable accurate and transparent performance evaluation of radiative cooling materials.

Main Methods:

  • Optical property assessment using integrating sphere spectrometers for solar and IR spectra.
  • Development of outdoor testing platforms with thermal insulation and radiation shielding.
  • Implementation of indoor testing platforms and a MATLAB-based code for theoretical evaluation.

Main Results:

  • Established procedures for evaluating optical and thermal properties of various radiative cooling material forms.
  • Demonstrated functional outdoor and indoor testing platforms for performance assessment.
  • Provided a rapid theoretical evaluation code for radiative cooling materials.

Conclusions:

  • The developed procedures and platforms offer a standardized method for radiative cooling material evaluation.
  • These systems facilitate transparent comparison of material performance across different applications.
  • The research addresses the need for consistent evaluation in the field of radiative cooling technology.