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Related Concept Videos

Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Radiation: Applications01:17

Radiation: Applications

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...
Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.

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Related Experiment Video

Updated: Jun 16, 2026

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

Fundamental concepts, design rules and potentials in radiative cooling.

Zhuning Wang1, Sijie Pian2, Yulei Zhang2

  • 1College of Optical Science and Engineering, Zhejiang University, Zheda road 38, Hangzhou, 310058, CHINA.

Reports on Progress in Physics. Physical Society (Great Britain)
|March 28, 2025
PubMed
Summary

Radiative cooling offers a sustainable solution to combat global warming by reducing energy consumption from traditional refrigeration. This renewable technology presents innovative methods and diverse applications for a greener future.

Keywords:
directional thermal radiationdynamic thermal managementnon-reciprocal thermal radiationradiative coolingstructural optimization designthermal photonics

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Comparative Study of Simulation of Temperature Rise in Ring Main Unit
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Optimization of An Air-Based Heat Management System for Dusty Particulate Matter-Covered Lithium-Ion Battery Packs
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Optimization of An Air-Based Heat Management System for Dusty Particulate Matter-Covered Lithium-Ion Battery Packs

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Comparative Study of Simulation of Temperature Rise in Ring Main Unit
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Comparative Study of Simulation of Temperature Rise in Ring Main Unit

Published on: July 5, 2024

Area of Science:

  • Materials Science
  • Thermodynamics
  • Renewable Energy

Background:

  • Escalating global warming and extreme climates necessitate urgent solutions to reduce energy consumption and greenhouse gas emissions from refrigeration.
  • Radiative cooling emerges as a key renewable cooling technology critical for mitigating climate change impacts.

Purpose of the Study:

  • To review the theoretical models of radiative cooling emitters and their performance in complex environments.
  • To explore innovative modulation techniques and recent advancements in radiative cooling materials and device design.
  • To summarize potential applications and challenges of radiative cooling for sustainable development.

Main Methods:

  • Investigation of thermodynamic interactions between environmental factors and cooling surfaces.
  • Examination of asymmetric/non-reciprocal radiative heat transfer mechanisms.
  • Summarization of structural design and simulation methodologies for radiative cooling materials.

Main Results:

  • Analysis of thermodynamic principles governing radiative cooling emitters.
  • Overview of advanced modulation techniques and material design strategies.
  • Identification of diverse applications including energy-efficient buildings, personal thermal management, and photovoltaic cooling.

Conclusions:

  • Radiative cooling technology holds significant promise for energy conservation and promoting a sustainable society.
  • Further research and development are crucial to overcome current challenges and fully realize the potential of radiative cooling applications.