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相关概念视频

Heating and Cooling Curves02:44

Heating and Cooling Curves

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q,...
22.3K
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

1.1K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.1K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

242
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...
242
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.2K
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...
3.2K
Mechanism of heat transfer01:19

Mechanism of heat transfer

1.1K
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...
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

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相关实验视频

Updated: May 21, 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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集成辐射冷却和太阳能加热,以实现按需的热管理.

Hongmei Zhong1, Jiahao Zhang2, Ming Sun2

  • 1School of Mechanical and Electrical Engineering, Shenzhen Polytechnic University, Shenzhen, Guangdong 518055, PR China.

Langmuir : the ACS journal of surfaces and colloids
|May 7, 2025
PubMed
概括

双模式设备将被动辐射冷却与太阳能加热相结合,用于多功能温度控制. 这种方法克服了单模系统的局限性,在波动的环境中实现按需冷却和加热.

科学领域:

  • 可持续的能源技术 可持续的能源技术
  • 热管理是一种热管理.

背景情况:

  • 被动辐射冷却为传统冷却系统提供了一个可持续的替代方案.
  • 仅仅依赖辐射冷却在波动的温度下是有限的,可能导致过度冷却.
  • 将太阳能加热与辐射冷却相结合,可以创建双模式设备,以增强热管理.

研究的目的:

  • 总结最近在可切换双模式辐射冷却和太阳能加热设备的进展.
  • 突出这些双模式系统的关键设计策略.
  • 讨论未来对按需辐射冷却和加热的实际应用的前景.

主要方法:

  • 对双模辐射冷却和太阳能加热系统的当前研究进行了审查.
  • 将设计策略分类为Janus和全合一方法.
  • 对技术进步的挑战和机遇的分析.

主要成果:

  • 双模式设备有效地整合了被动辐射冷却和太阳能加热.
  • 詹纳斯和全合一设计是可切换功能的主要策略.
  • 集成解决了在可变的热条件下单模系统的局限性.

结论:

  • 可切换的双模式设备为按需的热管理提供了一个有希望的解决方案.

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation

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  • 需要进一步的研究来克服挑战并实现实际应用.
  • 在这个领域的进步为更可持续和多功能冷却和加热解决方案铺平了道路.