radiation coefficient

简明释义

辐射系数

英英释义

例句

1.A higher radiation coefficient indicates better absorption of thermal radiation.

更高的辐射系数表示对热辐射的更好吸收能力。

2.In solar panel design, optimizing the radiation coefficient can significantly improve energy efficiency.

在太阳能电池板设计中，优化辐射系数可以显著提高能效。

3.Engineers must calculate the radiation coefficient when assessing materials for high-temperature applications.

工程师在评估高温应用材料时必须计算辐射系数。

4.The radiation coefficient of a building's exterior affects its heating and cooling requirements.

建筑外部的辐射系数会影响其供暖和制冷需求。

5.The radiation coefficient is crucial for determining how much heat a material can absorb from its environment.

该辐射系数对于确定材料能从环境中吸收多少热量至关重要。

作文

In the study of heat transfer and thermodynamics, the concept of the radiation coefficient is essential for understanding how energy is exchanged in the form of electromagnetic radiation. The radiation coefficient refers to a measure of the ability of a surface to emit or absorb thermal radiation. It is a dimensionless quantity that ranges from 0 to 1, where a value of 0 indicates no emission or absorption, and a value of 1 signifies perfect emission or absorption. This property is critical in various applications, including engineering, environmental science, and even astrophysics.To comprehend the significance of the radiation coefficient, one must first understand the fundamental principles of thermal radiation. All objects emit radiation based on their temperature, and this emission occurs across a spectrum of wavelengths. The Stefan-Boltzmann law states that the total energy radiated per unit surface area of a black body is proportional to the fourth power of its absolute temperature. However, real surfaces are not perfect black bodies; hence, their radiation coefficient must be considered when calculating the actual emitted radiation.For instance, consider a building's exterior walls. The materials used, such as brick, concrete, or glass, have different radiation coefficients. A wall with a high radiation coefficient will lose heat more rapidly than one with a low radiation coefficient. This phenomenon has implications for energy efficiency in buildings. By selecting materials with appropriate radiation coefficients, architects and engineers can minimize heat loss in winter and reduce heat gain in summer, leading to lower energy consumption and increased comfort for occupants.Moreover, understanding the radiation coefficient is crucial in environmental science, particularly in studying climate change. The Earth’s surface absorbs solar radiation and re-emits it as thermal radiation. Different surfaces, such as forests, deserts, and oceans, possess varying radiation coefficients, affecting their heat absorption and emission rates. This variability plays a significant role in the Earth's energy balance and climate regulation. For example, darker surfaces like asphalt have a higher radiation coefficient compared to lighter surfaces like snow, which reflects much of the incoming solar radiation.In astrophysics, the radiation coefficient is also vital for understanding stellar atmospheres and the behavior of celestial bodies. Stars emit radiation across a wide range of wavelengths, and their radiation coefficients influence how they interact with surrounding matter. This interaction affects everything from the temperature of a star's surface to the formation of planetary atmospheres.In conclusion, the radiation coefficient is a fundamental concept that permeates various fields of science and engineering. Its ability to quantify how surfaces emit and absorb thermal radiation makes it indispensable for designing energy-efficient systems, understanding environmental processes, and exploring the universe. By grasping the implications of the radiation coefficient, we can make informed decisions that enhance sustainability and improve our understanding of the natural world.

在热传递和热力学的研究中，辐射系数的概念对于理解能量如何以电磁辐射的形式交换至关重要。辐射系数是指表面发射或吸收热辐射能力的度量。它是一个无量纲量，范围从0到1，其中0表示没有发射或吸收，而1则表示完美的发射或吸收。这个特性在工程、环境科学甚至天体物理学等多个应用中都是关键的。为了理解辐射系数的重要性，首先必须了解热辐射的基本原理。所有物体根据其温度发射辐射，这种发射发生在一系列波长上。斯特藩-玻尔兹曼定律指出，黑体单位表面面积辐射的总能量与其绝对温度的四次方成正比。然而，真实表面并不是完美的黑体，因此在计算实际发射的辐射时必须考虑其辐射系数。例如，考虑建筑物的外墙。所使用的材料，如砖、混凝土或玻璃，具有不同的辐射系数。具有高辐射系数的墙壁将比低辐射系数的墙壁更快地失去热量。这种现象对建筑物的能源效率有影响。通过选择适当的辐射系数的材料，建筑师和工程师可以减少冬季的热量损失，并降低夏季的热量增益，从而降低能源消耗，提高居住者的舒适度。此外，理解辐射系数在环境科学中也至关重要，特别是在研究气候变化时。地球表面吸收太阳辐射并重新发射为热辐射。不同的表面，如森林、沙漠和海洋，具有不同的辐射系数，影响其热量吸收和发射速率。这种变异在地球的能量平衡和气候调节中发挥了重要作用。例如，深色表面如沥青的辐射系数高于雪等浅色表面，后者反射了大部分入射的太阳辐射。在天体物理学中，辐射系数对于理解恒星大气和天体行为也至关重要。恒星在广泛的波长范围内发射辐射，其辐射系数影响它们与周围物质的相互作用。这种相互作用影响从恒星表面的温度到行星大气的形成等各个方面。总之，辐射系数是一个基础概念，渗透到科学和工程的各个领域。它量化表面发射和吸收热辐射的能力，使其成为设计节能系统、理解环境过程和探索宇宙不可或缺的工具。通过掌握辐射系数的含义，我们可以做出明智的决策，以增强可持续性并改善我们对自然世界的理解。