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相关概念视频

Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

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

Mechanisms of Heat Transfer I

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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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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, and its...
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Updated: Jul 30, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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高性能多模弹性热量冷却系统

Suxin Qian1,2, David Catalini2, Jan Muehlbauer2

  • 1Department of Refrigeration and Cryogenic Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.

Science (New York, N.Y.)
|May 18, 2023
PubMed
概括
此摘要是机器生成的。

研究人员使用耐疲劳的尼醇管开发了一种高性能弹性热量冷却系统. 这项创新技术提供了显著的冷却功率和温度范围,为商业化先进的冷却解决方案铺平了道路.

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科学领域:

  • 材料科学
  • 热力学
  • 可持续能源

背景情况:

  • 全球气候变化需要开发具有零全球变暖潜力的制冷剂.
  • 热量冷却技术提供高效率,但在实际应用中面临挑战.
  • 弹性热量冷却是一种新兴技术,具有可持续冷却解决方案的潜力.

研究的目的:

  • 开发和评估一个高性能弹性热量冷却系统.
  • 证明在新型热交换架构中使用耐疲劳的尼醇管的可行性.
  • 评估弹性热量冷却的商业化潜力.

主要方法:

  • 使用耐疲劳的酸 (NiTi) 管制造的冷却系统.
  • 实现多功能的多模式热交换架构.
  • 试验测试以确定冷却功率和温度范围.

主要成果:

  • 达到260瓦的最大冷却功率.
  • 显示最大温度范围为22.5克尔文.
  • 报告的性能指标是热量制冷系统中最高的.

结论:

  • 开发的弹性热量冷却系统表现出高性能,具有显著的冷却功率和温度范围.
  • 在多模式换热器中使用耐疲劳的NiTi管是实现这些结果的关键.
  • 弹性热量冷却为先进的,可持续的冷却技术的商业化提供了一个有前途的途径.