Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Heat Engines01:10

Heat Engines

3.6K
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...
3.6K
Otto and Diesel Cycle01:27

Otto and Diesel Cycle

3.5K
An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
3.5K
The Carnot Cycle01:30

The Carnot Cycle

4.0K
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...
4.0K
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

4.2K
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...
4.2K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

1.6K
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...
1.6K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

5.9K
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.
5.9K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Sustainable fuel and power from biomass: 4E analysis of a solar-assisted DME production system with CO₂ capture.

Biotechnology reports (Amsterdam, Netherlands)·2025
Same author

Biomimetic Design of Breathable 2D Photothermal Fabric with Three-Layered Structure for Efficient Four-Plane Evaporation of Seawater.

Advanced materials (Deerfield Beach, Fla.)·2025
Same author

Enhanced ensemble learning-based uncertainty and sensitivity analysis of ventilation rate in a novel radiative cooling building.

Heliyon·2025
Same author

Renewable energy and cryptocurrency: A dual approach to economic viability and environmental sustainability.

Heliyon·2025
Same author

Techno-economic study of gas turbines with hydrogen, ammonia, and their mixture fuels.

Heliyon·2024
Same author

Thermo- economic feasibility of solar-assisted regeneration in post-combustion carbon capture: A diglycolamine-based case.

Heliyon·2024

相关实验视频

Updated: Jan 14, 2026

Design and Optimization Strategies of a High-Performance Vented Box
14:23

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

1.5K

一种结构优化方法,用于最大限度地提高多阶段自我超热系统的功率输出.

Mohammad-Mahdi Pazuki1, Mohammad Ebadollahi2, Majid Amidpour1

  • 1Faculty of Mechanical Engineering, Department of Energy System Engineering, K.N. Toosi University of Technology, Pardis Ave, Tehran, Iran.

MethodsX
|October 27, 2025
PubMed
概括

本研究提出了一种优化多级电力系统的新方法,将发电量增加4.96%并减少组件磨损. 该方法系统地确定了改善能源效率的最佳系统架构.

关键词:
能源效率 能源效率是指能源的使用效率.优化方法的优化方法.自动超热自动加热蒸汽轮机的蒸汽轮机结构程序 结构程序

更多相关视频

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
10:36

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption

Published on: November 3, 2023

2.1K
Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure
07:58

Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure

Published on: January 18, 2021

6.4K

相关实验视频

Last Updated: Jan 14, 2026

Design and Optimization Strategies of a High-Performance Vented Box
14:23

Design and Optimization Strategies of a High-Performance Vented Box

Published on: June 9, 2023

1.5K
Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
10:36

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption

Published on: November 3, 2023

2.1K
Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure
07:58

Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure

Published on: January 18, 2021

6.4K

科学领域:

  • 热力学和能源系统工程 热力学和能源系统工程
  • 机械工程 机械工程
  • 可持续能源技术 可持续能源技术

背景情况:

  • 传统的电力系统优化通常依赖于固定的配置,限制了潜在的效率增长.
  • 整合诸如蒸汽轮机和有机兰金循环等组件需要复杂的协调才能达到最佳性能.
  • 尽量减少侵蚀和能量破坏对于提高热电系统的寿命和效率至关重要.

研究的目的:

  • 为多级发电系统引入一种新的结构优化方法.
  • 系统地确定系统组件的最佳数量和排列.
  • 为了最大限度地提高功率输出和改善能源利用在各种热电应用.

主要方法:

  • 一个三层嵌套的算法框架,用于系统的结构优化.
  • 一个通用的算法,用于代评估不同的结构配置.
  • 协调的多阶段优化,平衡循环之间的蒸汽流量和压力分布.

主要成果:

  • 在发电方面实现了4.96%的增长.
  • 轮出口的水分含量减少了19.02%和17.38%,减轻了侵蚀风险.
  • 减少了3.82%和0.85%的能量破坏,这表明能量利用得到了改善.

结论:

  • 这种新的方法有效地优化了多级电力系统架构,以提高性能.
  • 该方法在输出功率,组件寿命和能源效率方面提供了显著的改进.
  • 一般化方法适用于广泛的热电系统,包括可再生能源.