log mean temperature difference

简明释义

对数平均温差

英英释义

例句

1.In heat exchanger design, the calculation of log mean temperature difference (对数平均温差) is crucial for determining the efficiency of heat transfer.

在热交换器设计中，对数平均温差 (log mean temperature difference) 的计算对于确定热传递的效率至关重要。

2.The formula for calculating the log mean temperature difference (对数平均温差) involves the inlet and outlet temperatures of the fluids involved.

计算 对数平均温差 (log mean temperature difference) 的公式涉及到参与流体的入口和出口温度。

3.In HVAC applications, understanding the log mean temperature difference (对数平均温差) helps in sizing equipment correctly.

在暖通空调应用中，理解 对数平均温差 (log mean temperature difference) 有助于正确选择设备的大小。

4.To improve energy efficiency, we need to monitor the log mean temperature difference (对数平均温差) in our heat recovery systems.

为了提高能效，我们需要监测热回收系统中的 对数平均温差 (log mean temperature difference)。

5.Engineers often use the log mean temperature difference (对数平均温差) to optimize the thermal performance of cooling systems.

工程师通常使用 对数平均温差 (log mean temperature difference) 来优化冷却系统的热性能。

作文

The concept of log mean temperature difference is a critical parameter in the field of heat transfer and thermodynamics. In essence, it measures the average temperature difference between two fluids that are exchanging heat. Understanding this concept is essential for engineers and designers who work with heat exchangers, as it directly influences the efficiency and effectiveness of thermal systems. To grasp the significance of log mean temperature difference (LMTD), one must first understand how heat exchangers operate. Heat exchangers are devices designed to transfer heat from one medium to another without mixing them. They are widely used in various applications, including refrigeration, air conditioning, and industrial processes. The performance of a heat exchanger is largely determined by the temperature difference between the hot and cold fluids. The log mean temperature difference is calculated using the inlet and outlet temperatures of both fluids. The formula for LMTD is given by: 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. This logarithmic approach is necessary because the temperature difference is not constant along the length of the heat exchanger. By using the logarithm, engineers can obtain a more accurate representation of the average temperature difference, which is crucial for calculating the heat transfer rate. One of the key advantages of using log mean temperature difference is that it allows for a more precise design of heat exchangers. When the temperature difference is significant, the LMTD will provide a higher value, indicating a greater potential for heat transfer. Conversely, when the temperature difference is small, the LMTD will yield a lower value, suggesting that the heat exchanger may not be operating efficiently. In practical applications, the log mean temperature difference plays a vital role in determining the size and type of heat exchanger required for a specific application. For instance, if an engineer is tasked with designing a heat exchanger for a power plant, they will need to calculate the LMTD to ensure that the system can handle the necessary heat transfer effectively. A larger LMTD will generally mean a smaller heat exchanger can be used, which can lead to cost savings and improved system performance. Moreover, understanding log mean temperature difference can also help in troubleshooting existing systems. If a heat exchanger is not performing as expected, engineers can analyze the LMTD to identify potential issues, such as fouling or incorrect flow rates. By addressing these problems, they can optimize the heat exchanger's performance and extend its operational lifespan. In conclusion, the log mean temperature difference is a fundamental concept in heat transfer that provides invaluable insights into the performance of heat exchangers. Its ability to accurately represent the average temperature difference between two fluids makes it an essential tool for engineers and designers. By mastering this concept, professionals in the field can enhance the efficiency of thermal systems, leading to better energy utilization and cost-effectiveness in various industrial applications.

“对数平均温差”（log mean temperature difference）是热传递和热力学领域中的一个关键参数。从本质上讲，它测量的是两个流体之间交换热量时的平均温度差。理解这一概念对于从事热交换器工作的工程师和设计师至关重要，因为它直接影响热系统的效率和有效性。要理解对数平均温差（LMTD）的重要性，首先必须了解热交换器的工作原理。热交换器是旨在在不混合两种介质的情况下转移热量的设备。它们广泛应用于制冷、空调和工业过程等各种应用中。热交换器的性能在很大程度上取决于热流体和冷流体之间的温度差。对数平均温差是通过计算两种流体的进出口温度得出的。LMTD的公式为：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。由于沿着热交换器的长度温度差并不恒定，因此需要使用对数方法。通过使用对数，工程师可以获得更准确的平均温度差表示，这对于计算热传递率至关重要。使用对数平均温差的一个关键优势在于，它允许对热交换器进行更精确的设计。当温度差显著时，LMTD将提供更高的值，表明热传递的潜力更大。相反，当温度差较小时，LMTD将产生较低的值，表明热交换器可能没有有效运作。在实际应用中，对数平均温差在确定特定应用所需的热交换器的大小和类型方面发挥着至关重要的作用。例如，如果一位工程师负责为发电厂设计热交换器，他们需要计算LMTD，以确保系统能够有效处理必要的热传递。较大的LMTD通常意味着可以使用较小的热交换器，这可以带来成本节约和系统性能的改善。此外，理解对数平均温差还可以帮助排查现有系统的问题。如果热交换器的性能未如预期，工程师可以分析LMTD以识别潜在问题，例如污垢或流量不正确。通过解决这些问题，他们可以优化热交换器的性能并延长其使用寿命。总之，对数平均温差是热传递中的基本概念，为热交换器的性能提供了宝贵的见解。它能够准确表示两种流体之间的平均温度差，使其成为工程师和设计师的重要工具。通过掌握这一概念，行业专业人士可以提高热系统的效率，从而在各种工业应用中实现更好的能源利用和成本效益。