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相关概念视频

Heating and Cooling Curves02:44

Heating and Cooling Curves

22.9K
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, and its...
22.9K
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...
1.2K
Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

2.3K
Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
2.3K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

333
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...
333
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.3K
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...
3.3K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

4.3K
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.
4.3K

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相关实验视频

Updated: Jul 9, 2025

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

Published on: May 2, 2016

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通过线圈曲的连续和高效的弹性热量空气冷却.

Xueshi Li1, Peng Hua2,3, Qingping Sun4,5

  • 1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China.

Nature communications
|December 2, 2023
PubMed
概括

一种新的弹性热量冷却方法使用NiTi线圈曲用于环保空调. 这种方法可以实现低功率和高效率的显著冷却,为传统制冷剂提供可持续的替代方案.

更多相关视频

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

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

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相关实验视频

Last Updated: Jul 9, 2025

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

Published on: May 2, 2016

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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

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

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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.
  • 可持续能源 可持续能源

背景情况:

  • 弹性热量冷却为温室气体制冷剂提供了一个环保的替代方案.
  • 目前的弹性热量冷却方法面临的局限性是由于高驱动力和低效率在单轴负载.

研究的目的:

  • 开发一种低力,高能效的弹性热量空气冷却系统.
  • 为了研究使用NiTi带/电线的线圈曲方法的有效性.

主要方法:

  • 用于弹性热量冷却的卷轴曲配置的使用的NiTi带/电线.
  • 测量温度下降,特定的冷却功率和特定的驱动力.
  • 评估系统性能系数和特定传热面积.

主要成果:

  • 实现了连续冷出口空气温度下降10.6K.
  • 在26N/g的低特异驱动力下,获得2.5W/g的特异冷却功率.
  • 证明了系统性能系数为3.7,这归因于具有很大的特定传热面积 (12.6cm2/g).

结论:

  • 卷轴曲的NiTi系统提供了一个高效和低力弹性热量冷却解决方案.
  • 这种方法与其他热量空气冷却器相比,具有竞争力的性能.
  • 开发的方法显示了可持续和高效的空调应用的前景.