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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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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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Mechanisms of Heat Transfer01:14

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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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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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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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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Scalable radiative cooling materials are crucial for addressing global overheating without energy consumption.
  • Current materials face limitations in application range, cooling efficiency, and mechanical robustness, hindering sustainable use.

Purpose of the Study:

  • To develop a flexible, strong, and tough high-efficiency radiative cooling metafabric (STRCM).
  • To overcome the limitations of existing radiative cooling technologies by mimicking natural structures.

Main Methods:

  • Inspired by white moth wings and spider silk, a unique fiber microstructure with anisotropy and core-shell structure was engineered.
  • Mechanical properties (tensile strength, toughness, impact energy absorption) and radiative cooling performance were evaluated.
  • Long-term intermittent testing was conducted to assess durability.

Main Results:

  • The STRCM exhibited remarkable mechanical properties: 2.55 MPa tensile strength, 726.94% elongation at break, and 31 MJ m⁻³ impact energy absorption.
  • Achieved significant radiative cooling with a ≈6.7 °C temperature drop and 79.0 W m⁻² cooling power under ≈978 W m⁻² solar intensity.
  • Demonstrated no noticeable decline in cooling effect after long-term intermittent testing.

Conclusions:

  • The multi-level structural design provides an effective strategy for enhancing both mechanical properties and radiative cooling performance.
  • The developed STRCM offers a promising solution for sustainable, long-term passive cooling applications.
  • This work presents a novel approach for designing advanced functional textiles.