logarithmic mean temperature difference

简明释义

对数平均温差

英英释义

例句

1.In HVAC design, the logarithmic mean temperature difference (对数平均温度差) helps engineers calculate the required heat transfer rates.

在暖通空调设计中，对数平均温度差(对数平均温度差)帮助工程师计算所需的热传递率。

2.The calculation of the heat transfer in a heat exchanger often requires the use of the logarithmic mean temperature difference (对数平均温度差) to ensure accuracy.

在热交换器的热量传递计算中，通常需要使用对数平均温度差(对数平均温度差)以确保准确性。

3.The logarithmic mean temperature difference (对数平均温度差) is critical in determining the effectiveness of thermal processes.

在确定热过程的有效性时，对数平均温度差(对数平均温度差)是至关重要的。

4.To optimize performance, the logarithmic mean temperature difference (对数平均温度差) must be calculated for each section of the heat exchanger.

为了优化性能，必须为热交换器的每个部分计算对数平均温度差(对数平均温度差)。

5.Engineers use the logarithmic mean temperature difference (对数平均温度差) formula to design more efficient cooling systems.

工程师使用对数平均温度差(对数平均温度差)公式来设计更高效的冷却系统。

作文

In the field of thermodynamics and heat transfer, understanding the efficiency of heat exchangers is crucial for optimizing energy use in various industrial processes. One important concept in this area is the logarithmic mean temperature difference, often abbreviated as LMTD. The logarithmic mean temperature difference is a method used to determine the temperature driving force for heat exchange between two fluids. It is particularly useful when the temperature difference between the hot and cold fluids varies along the length of the heat exchanger.To grasp the significance of the logarithmic mean temperature difference, it is essential to understand how heat exchangers operate. In a typical heat exchanger, one fluid is heated while the other is cooled. The effectiveness of this process depends on the temperature gradient between the two fluids. The greater the difference in temperature, the more efficient the heat transfer. However, in many practical applications, the temperature of the fluids can change significantly as they flow through the heat exchanger.The logarithmic mean temperature difference provides a more accurate representation of the average temperature difference across the heat exchanger than a simple arithmetic mean. This is because it accounts for the fact that the temperature differences at each end of the heat exchanger are not the same. Mathematically, the logarithmic mean temperature difference is calculated using the formula:LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)where ΔT1 is the temperature difference at one end of the heat exchanger and ΔT2 is the temperature difference at the other end. The natural logarithm function, ln, is used in this equation to provide a more accurate average that reflects the exponential nature of heat transfer.Using the logarithmic mean temperature difference allows engineers to design more efficient heat exchangers by accurately predicting the heat transfer rate. This is critical in industries such as power generation, chemical processing, and HVAC systems, where energy efficiency can lead to significant cost savings and reduced environmental impact.Moreover, the logarithmic mean temperature difference is not just limited to traditional heat exchangers. It can also be applied to various configurations, including counterflow, parallel flow, and crossflow heat exchangers. Each configuration has its unique characteristics, and understanding the logarithmic mean temperature difference helps engineers choose the right design for specific applications.In conclusion, the logarithmic mean temperature difference is a fundamental concept in the study of heat exchangers and thermal systems. Its ability to provide a more accurate measure of the average temperature difference between two fluids makes it an indispensable tool for engineers and scientists working in the field of thermal dynamics. By leveraging the insights gained from the logarithmic mean temperature difference, we can enhance the efficiency of heat transfer processes, leading to more sustainable and economically viable industrial practices.

在热力学和热传递领域，理解热交换器的效率对于优化各种工业过程中的能源使用至关重要。一个重要的概念是对数平均温度差，通常缩写为LMTD。对数平均温度差是一种用于确定两种流体之间热交换的温度驱动力的方法。它在热交换器的长度上，热流体与冷流体之间的温度差异变化时特别有用。要理解对数平均温度差的重要性，首先需要了解热交换器的工作原理。在典型的热交换器中，一种流体被加热，而另一种流体被冷却。这一过程的有效性取决于两种流体之间的温度梯度。温差越大，热传递的效率就越高。然而，在许多实际应用中，随着流体在热交换器中流动，流体的温度可能会显著变化。对数平均温度差提供了一种比简单的算术平均值更准确的热交换器内的平均温度差表示。这是因为它考虑到热交换器两端的温度差并不相同。数学上，对数平均温度差的计算公式为：LMTD = (ΔT1 - ΔT2) / ln(ΔT1 / ΔT2)其中ΔT1是热交换器一端的温度差，ΔT2是另一端的温度差。该方程中使用自然对数函数ln，以提供一个更准确的平均值，反映出热传递的指数特性。使用对数平均温度差使工程师能够通过准确预测热传递率来设计更高效的热交换器。这在电力生成、化学加工和暖通空调系统等行业中至关重要，因为能源效率可以带来显著的成本节省和减少环境影响。此外，对数平均温度差不仅限于传统的热交换器。它还可以应用于各种配置，包括逆流、平行流和交叉流热交换器。每种配置都有其独特的特性，理解对数平均温度差帮助工程师选择适合特定应用的正确设计。总之，对数平均温度差是热交换器和热系统研究中的一个基本概念。它能够提供两种流体之间平均温度差的更准确测量，使其成为热动态领域工程师和科学家不可或缺的工具。通过利用对数平均温度差获得的见解，我们可以增强热传递过程的效率，从而导致更可持续和经济合理的工业实践。