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相关概念视频

The Carnot Cycle01:30

The Carnot Cycle

3.0K
Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
3.0K
Efficiency of The Carnot Cycle01:16

Efficiency of The Carnot Cycle

2.7K
The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
2.7K
The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

2.7K
The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
2.7K
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

419
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
419
Heat Engines01:10

Heat Engines

2.9K
A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
2.9K
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

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相关实验视频

Updated: Jul 24, 2025

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

Published on: February 5, 2020

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最大效能功率性能分析和双相热电发电机的多目标优化.

Lei Tian1,2,3, Lingen Chen1,2,3, Yanlin Ge1,2,3

  • 1Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan 430205, China.

Entropy (Basel, Switzerland)
|July 8, 2023
PubMed
概括

这项研究优化了使用有限时间热力学和NSGA-II算法实现最大效能的两级热电发电机. 通过调整换热器面积和热电元件分布来提高性能.

关键词:
有效的功率效率是有效的功率.有限时间热力学有限时间热力学多目标优化多目标优化热交换器面积的最佳分布热电元件的最佳分布 热电元件的最佳分布两个阶段的热电发电机.

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Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics

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Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Published on: August 30, 2024

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科学领域:

  • 热力学是一种热力学.
  • 能源转换 能源转换
  • 材料科学 材料科学 材料科学

背景情况:

  • 双阶段热电发电机 (TEG) 在航空航天,军事,工业和日常应用中至关重要.
  • 优化TEG性能对于提高能源采集效率至关重要.

研究的目的:

  • 使用有限时间热力学推断二阶段TEG的有效功率表达式.
  • 为了优化热交换器面积,热电元件和工作电流的分布,以获得最大的效率功率.
  • 使用NSGA-II算法进行多目标优化.

主要方法:

  • 应用有限时间热力学来导出高效功率表达式.
  • 热交换器面积的优化,热电元件的分布和工作电流.
  • 使用NSGA-II算法进行多目标优化,目标是无维输出功率,热效率和无维高效功率.

主要成果:

  • 随着热电元件数量的增加,最大有效功率就会下降 (40至100个元件的0.308W至0.2381W).
  • 随着更大的换热器面积 (0.0603W到0.3777W为0.03m2到0.09m2),最大有效功率显著增加).
  • 多目标优化产生了0.1866 (LINMAP),0.1866 (TOPSIS) 和0.1815 (香农) 的偏差指数.

结论:

  • 该研究成功优化了两阶段的TEG,以提高性能.
  • 换热器面积和热电元件分布是最大化高效功率的关键参数.
  • NSGA-II算法为TEGs的多目标优化提供了一种有效的方法.