overall heat transfer coefficient

简明释义

热传递系数

英英释义

例句

1.The overall heat transfer coefficient can vary depending on the materials used in the construction of the system.

由于系统构造中使用的材料不同，整体热传递系数可能会有所变化。

2.A higher overall heat transfer coefficient indicates better heat transfer performance in thermal systems.

较高的整体热传递系数表明热系统中更好的热传递性能。

3.To optimize the cooling system, engineers need to measure the overall heat transfer coefficient accurately.

为了优化冷却系统，工程师需要准确测量整体热传递系数。

4.The design of the heat exchanger was based on the calculated overall heat transfer coefficient, which is crucial for efficiency.

热交换器的设计基于计算出的整体热传递系数，这是提高效率的关键。

5.In HVAC applications, the overall heat transfer coefficient plays a vital role in energy efficiency calculations.

在暖通空调应用中，整体热传递系数在能效计算中起着至关重要的作用。

作文

The concept of the overall heat transfer coefficient is crucial in the field of thermal engineering and heat transfer analysis. Essentially, it represents the efficiency with which heat is transferred through a system, such as a heat exchanger or an insulated wall. The overall heat transfer coefficient combines the effects of conduction, convection, and sometimes radiation into a single value, allowing engineers to assess the thermal performance of various materials and designs. To understand the importance of the overall heat transfer coefficient, we must first consider the different modes of heat transfer. Conduction occurs when heat moves through a solid material due to a temperature gradient. For instance, when one side of a metal rod is heated, the other side gradually warms up as heat travels through the metal. The rate of conduction is influenced by the material's thermal conductivity, thickness, and surface area. Convection, on the other hand, involves the transfer of heat between a solid surface and a fluid (liquid or gas) in motion. This process can be natural, such as warm air rising, or forced, like air blown over a radiator. The efficiency of convection is affected by factors such as fluid velocity and temperature difference between the surface and the fluid. Lastly, radiation is the transfer of heat through electromagnetic waves, which does not require a medium. It plays a significant role in high-temperature applications where surfaces emit and absorb thermal radiation. When designing systems that involve heat transfer, engineers often need to calculate the overall heat transfer coefficient to ensure optimal performance. This coefficient is defined as the total heat transfer rate per unit area per unit temperature difference between the two sides of the material. It is expressed in watts per square meter per Kelvin (W/m²K). A higher overall heat transfer coefficient indicates better heat transfer capability, while a lower value suggests insulation or poor thermal contact. In practical applications, the overall heat transfer coefficient can vary significantly depending on the materials used, the design of the system, and the operating conditions. For example, in a heat exchanger, the choice of materials for the tubes and the fluid flow rates can greatly influence the overall heat transfer coefficient. Engineers often use empirical correlations and experimental data to estimate this coefficient for specific configurations. Moreover, understanding the overall heat transfer coefficient is essential for energy efficiency. In buildings, for instance, the overall heat transfer coefficient of walls, roofs, and windows determines how much energy is lost or gained, impacting heating and cooling costs. By improving insulation materials and minimizing thermal bridges, architects and engineers can reduce energy consumption and enhance comfort. In conclusion, the overall heat transfer coefficient is a fundamental parameter in heat transfer analysis. It encapsulates the complexities of conduction, convection, and radiation into a single value that is essential for designing efficient thermal systems. Whether in industrial applications or building design, a thorough understanding of this coefficient allows engineers to optimize performance and energy efficiency effectively.

“整体传热系数”这一概念在热工程和传热分析领域至关重要。它本质上表示热量通过系统（例如热交换器或绝缘墙）传递的效率。“整体传热系数”将导热、对流，有时还包括辐射的影响结合为一个值，使工程师能够评估各种材料和设计的热性能。要理解“整体传热系数”的重要性，我们首先必须考虑不同的传热方式。导热发生在由于温度梯度而使热量通过固体材料移动时。例如，当金属杆的一侧被加热时，另一侧会随着热量通过金属传递而逐渐变暖。导热速率受材料的导热性、厚度和表面积的影响。另一方面，对流涉及热量在固体表面与运动流体（液体或气体）之间的传递。这个过程可以是自然的，例如温暖的空气上升，或者是强制的，比如空气被吹过散热器。对流的效率受流体速度和表面与流体之间的温差等因素的影响。最后，辐射是通过电磁波传递热量的过程，它不需要介质。在高温应用中，辐射扮演着重要角色，因为表面会发射和吸收热辐射。在设计涉及热传递的系统时，工程师通常需要计算“整体传热系数”以确保最佳性能。该系数定义为单位面积每单位温度差的总热传递速率。其单位为瓦特每平方米每开尔文（W/m²K）。较高的“整体传热系数”表示更好的热传递能力，而较低的值则表明绝缘或热接触不良。在实际应用中，“整体传热系数”可能会因所用材料、系统设计和操作条件的不同而显著变化。例如，在热交换器中，管道的材料选择和流体流速会极大影响“整体传热系数”。工程师通常使用经验相关和实验数据来估算特定配置的此系数。此外，理解“整体传热系数”对于能源效率至关重要。例如，在建筑中，墙壁、屋顶和窗户的“整体传热系数”决定了能量的损失或获得，从而影响供暖和制冷成本。通过改善绝缘材料和最小化热桥，建筑师和工程师可以减少能源消耗并提高舒适度。总之，“整体传热系数”是传热分析中的基本参数。它将导热、对流和辐射的复杂性浓缩为一个值，这对于设计高效的热系统至关重要。无论是在工业应用还是建筑设计中，深入理解此系数使工程师能够有效优化性能和能源效率。