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相关概念视频

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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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

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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.
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...
1.1K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.1K
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.
4.1K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

158
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...
158
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

294
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...
294

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相关实验视频

Updated: May 17, 2025

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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三级结构诱导高效的被动辐射冷却,结合强大的抗冷凝.

Zehong Zhao1, Chengning Tang1, Enming Cui1

  • 1State Key Laboratory of High-performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, PR China.

ACS nano
|May 15, 2025
PubMed
概括

这项研究提出了一种用于被动辐射冷却的新型三级结构,即使在高湿度下,也能达到显著的下环境温度. 该设计提高了冷却效率,并防止了冷凝,提供了持久的热管理解决方案.

关键词:
抗凝聚的反凝结方式滴滴动力学 滴滴动力学被动辐射冷却是一种被动的辐射冷却.自行清洁的自动清洁器三重尺度的结构结构.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 热力学是一种热力学.
  • 光学是什么?光学是什么?

背景情况:

  • 通过向空间发射热辐射,被动辐射冷却提供了无能量下环境冷却.
  • 现有方法面临的挑战是抗凝结,限制在潮湿条件下使用.

研究的目的:

  • 开发一种具有强大的抗凝结性能的被动辐射冷却设计.
  • 研究三级结构对冷却效率和耐用性的影响.

主要方法:

  • 使用微尺度聚合物颗粒,亚微米间隙和纳米尺度毛孔制造三重尺度结构.
  • 在不同湿度下,光学性能 (反射率,发射率) 和热性能的表征.
  • 对抗凝结性能 (滴滴脱落,覆盖) 和材料耐用性的评估.

主要成果:

  • 在40%的相对湿度下达到10.9°C的环境下冷却,具有高的阳光反射率 (0.98) 和中红外辐射率 (0.91).
  • 在70%的相对湿度下显示显著的冷却 (~4°C),性能优于传统材料.
  • 展现出强大的反凝结,有效的滴滴散射和由于三级结构减少了覆盖范围.

结论:

  • 三级结构有效地提高了被动辐射冷却和抗凝结性能.
  • 这种设计显示了在多样化和极端环境中可靠的热管理的潜力.
  • 该材料具有出色的耐用性,包括自我清洁,耐热和抗UV.