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相关概念视频

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

707
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
707
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...
1.2K
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

328
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...
328
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.2K
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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相关实验视频

Updated: Jun 7, 2025

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

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高性能辐射冷却防晒

Jiaqi Xu1, Xueke Wu1, Yunrui Li1

  • 1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

Nano letters
|November 15, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的辐射冷却 (RC) 防晒,用于有效的户外皮肤冷却和紫外线保护. 与商业选择和裸体皮肤相比,RC防晒显著降低了皮肤温度.

关键词:
米散射是一种散射.在TiO2纳米粒子中.辐射冷却是一种辐射冷却.防晒是一种防晒.

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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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科学领域:

  • 材料科学 材料科学 材料科学
  • 热力工程是热力工程中的一个.
  • 生物医学工程 生物医学工程

背景情况:

  • 辐射冷却提供零能源的户外热管理.
  • 目前的防晒主要提供紫外线保护,而不是主动冷却.
  • 户外的人类热舒适是一个重大挑战.

研究的目的:

  • 开发一种辐射冷却 (RC) 防晒,用于增强皮肤冷却和紫外线保护.
  • 评估RC防晒在各种户外条件下的性能.
  • 评估开发的防晒的耐用性和生物相容性.

主要方法:

  • 制造具有特定光学性质的RC防晒 (低紫外线透射率,高太阳反射率,高中红外辐射率).
  • 在不同的户外场景下 (湿度,云层) 进行性能测试.
  • 评估紫外线稳定性,防水性,使用寿命和生物相容性.

主要成果:

  • 该RC防晒实现了低紫外线透射率 (4.86%),高太阳反射率 (90.19%) 和高中红外辐射率 (92.09%).
  • 与商业防晒相比,它降低了2.36.1°C的皮肤温度,与裸体皮肤相比,降低了4.26.0°C.
  • 防晒显示出良好的紫外线稳定性,耐水性,寿命长和生物相容性.

结论:

  • 开发的RC防晒有效地提供紫外线保护和显著的皮肤冷却.
  • 它在各种条件和有利性质中的表现表明其具有强大的商业潜力.
  • 这项技术为户外人类热管理提供了一个有前途的解决方案.