overall coefficient of heat transfer

简明释义

总传热系数

英英释义

例句

1.We analyzed the overall coefficient of heat transfer in various wall configurations to find the best option.

我们分析了不同墙体结构的整体热传递系数以寻找最佳选项。

2.The engineer calculated the overall coefficient of heat transfer to determine the efficiency of the heating system.

工程师计算了整体热传递系数以确定加热系统的效率。

3.The overall coefficient of heat transfer is crucial for designing energy-efficient HVAC systems.

对于设计节能的暖通空调系统，整体热传递系数至关重要。

4.A lower overall coefficient of heat transfer indicates better thermal performance of materials.

较低的整体热传递系数表明材料的热性能更佳。

5.In order to improve insulation, we need to reduce the overall coefficient of heat transfer in the building.

为了改善绝缘，我们需要降低建筑物的整体热传递系数。

作文

The concept of the overall coefficient of heat transfer is fundamental in the field of thermodynamics and heat exchange. It represents the efficiency with which heat is transferred through a material or system. Understanding this coefficient is crucial for engineers and designers who work on heating, ventilation, and air conditioning (HVAC) systems, as well as in the design of heat exchangers. The overall coefficient of heat transfer combines several modes of heat transfer: conduction, convection, and sometimes radiation, into a single value that can be used to evaluate the performance of thermal systems.In practical applications, the overall coefficient of heat transfer is often denoted by the symbol U. This coefficient is determined by various factors, including the materials involved, the thickness of the walls, the surface area available for heat transfer, and the temperature difference between the two sides of the material. For instance, in a typical wall assembly, the U-value will take into account the thermal resistance of each layer of material, as well as the effects of air films on either side of the wall. The importance of the overall coefficient of heat transfer cannot be overstated. In building design, for example, architects must consider this coefficient when selecting materials for insulation. A lower U-value indicates better insulating properties, which means less energy is required to maintain comfortable indoor temperatures. This has significant implications for energy efficiency and sustainability, as buildings account for a substantial portion of global energy consumption.Moreover, in industrial applications, the overall coefficient of heat transfer plays a critical role in the design of heat exchangers, where fluids at different temperatures are brought into contact to transfer heat. Engineers must optimize the U-value to ensure maximum heat transfer efficiency while minimizing energy losses. This involves careful selection of materials, flow arrangements, and surface treatments that enhance convective heat transfer.To calculate the overall coefficient of heat transfer, one must consider the individual resistances to heat flow. The total thermal resistance is the sum of the resistances of each layer and any additional resistances due to air films. Once the total resistance is known, the U-value can be calculated as the inverse of this total resistance. This mathematical relationship allows engineers to predict how changes in material properties or configurations will affect overall heat transfer performance.In conclusion, the overall coefficient of heat transfer is an essential parameter in the study of thermal systems. It encapsulates the effectiveness of heat transfer processes and informs decisions in both building construction and industrial applications. As the world increasingly focuses on energy efficiency and sustainability, understanding and optimizing the U-value will become even more critical in our efforts to reduce energy consumption and mitigate climate change. By mastering the principles behind the overall coefficient of heat transfer, professionals can contribute to the development of more efficient and environmentally friendly technologies.

总体热传递系数是热力学和热交换领域的基本概念。它表示热量通过材料或系统传递的效率。理解这个系数对于从事暖通空调（HVAC）系统设计的工程师和设计师至关重要，同时也适用于热交换器的设计。总体热传递系数将导热、对流，有时还包括辐射等多种热传递方式结合为一个单一值，以评估热系统的性能。在实际应用中，总体热传递系数通常用符号U表示。这个系数受到多种因素的影响，包括所涉及的材料、墙体的厚度、可用于热传递的表面积以及材料两侧的温差。例如，在典型的墙体结构中，U值将考虑每层材料的热阻，以及墙体两侧空气膜的影响。总体热传递系数的重要性不容小觑。在建筑设计中，建筑师在选择绝缘材料时必须考虑这一系数。较低的U值表示更好的绝缘性能，这意味着维持舒适室内温度所需的能量更少。这对能源效率和可持续性有着重要的影响，因为建筑物占全球能源消费的相当大一部分。此外，在工业应用中，总体热传递系数在热交换器的设计中扮演着关键角色，其中不同温度的流体被带入接触以传递热量。工程师必须优化U值，以确保最大限度的热传递效率，同时最小化能量损失。这涉及到对材料、流动安排和增强对流热传递的表面处理的精心选择。要计算总体热传递系数，必须考虑各个热流的单独阻力。总热阻是每层的阻力及任何附加的空气膜阻力之和。一旦知道了总阻力，就可以将U值计算为该总阻力的倒数。这种数学关系使工程师能够预测材料特性或配置变化将如何影响整体热传递性能。总之，总体热传递系数是研究热系统的重要参数。它概括了热传递过程的有效性，并为建筑施工和工业应用中的决策提供依据。随着全球越来越关注能源效率和可持续性，理解和优化U值将在我们减少能源消耗和减缓气候变化的努力中变得更加关键。通过掌握总体热传递系数背后的原理，专业人员可以为开发更高效和环保的技术做出贡献。