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関連する概念動画

The Carnot Cycle01:30

The Carnot Cycle

2.9K
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...
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Control of Power Flow01:30

Control of Power Flow

271
There are several methods to control power flow in power systems:
271
The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

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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
Energy Losses in Transformers01:21

Energy Losses in Transformers

881
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
881
Turbine-Governor Control01:17

Turbine-Governor Control

237
Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
237
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

211
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
211

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関連する実験動画

Updated: Jul 10, 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

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熱電発電機のボトルネックを壊す

Bo Xu1, Yongjun Tian1

  • 1Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

Science (New York, N.Y.)
|November 23, 2023
PubMed
まとめ
この要約は機械生成です。

研究者らは,フェーズ図を用いてインターフェース材料をスクリーニングし,熱電気装置の最良の選択肢を見つけました. この方法は,熱を電気に変換する効率を高める材料を効率的に特定します.

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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関連する実験動画

Last Updated: Jul 10, 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

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Author Spotlight: Advancements in High-Performance Thermoelectric Thin Films Through Radio Frequency Magnetron Sputtering
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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科学分野:

  • 材料科学
  • 熱力学について
  • エネルギー変換

背景:

  • 熱電気装置は廃棄熱を電気に変換する.
  • 最適なインターフェース材料を特定することは,デバイスの効率を向上させる上で極めて重要です.
  • 材料のスクリーニングの現在の方法は,時間がかかり,非効率的です.

研究 の 目的:

  • 段階図に基づくスクリーニング方法を開発し,適用する.
  • 熱電性能を向上させるための最適なインターフェース材料を特定する.
  • 廃棄熱の回収のための新しい材料の発見を加速する.

主な方法:

  • 材料の互換性と性質を予測するために,相図を用いた.
  • 熱力学原理に基づく高通量スクリーニング戦略を開発した.
  • 実験的な検証で評価された候補インタフェース材料 (詳細は要約で提供されていません).

主要な成果:

  • 熱電応用のための有望なインタフェース材料を成功裏に特定しました.
  • 段階図のアプローチは,材料候補を絞り込むのに効果的であることが示されました.
  • 熱電性物質の発見の より効率的な経路を示した.

結論:

  • 段階図に基づくスクリーニングは,熱電学における材料発見のための強力なツールです.
  • 最適なインターフェース材料は,熱を電気に変換する装置の性能を大幅に高めることができます.
  • このアプローチは次世代のエネルギー収集技術の開発を容易にする.