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首页> 外文期刊>International Journal of Heat Exchangers >Determining Log Mean Temperature Difference Correction Factor and Estimating Number of Shell and Tube Heat Exchangers
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Determining Log Mean Temperature Difference Correction Factor and Estimating Number of Shell and Tube Heat Exchangers

机译：确定对数平均温差校正因子并估算管壳式换热器的数量

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摘要

This problem aims at analysing an alternative model for LMTD Correction Factor 'F' in the process of designing a heat exchanger. In order to analyse the performance of heat exchanger the available approaches are LMTD and effectiveness (°). Since the expressions for Log Mean Temperature Difference (LMTD) Correction Factor 'F' are difficult to evaluate, the traditional analysis methods rely on the heat exchanger charts. Apart from being applicable only to a particular heat exchanger, these charts are highly nonlinear and expressed in terms of the non-dimensional parameters P and R. The LMTD correction factor 'F' charts are particularly difficult to read in the steep regions. In this study an alternative analytical approach for determining LMTD correction factor 'F' in terms of two non-dimensional parameters P and R is presented. This new approach results in a single general algebraic equation for determining the LMTD correction factor of multi-pass shell and tube heat exchangers with any number of shell passes and even number of tube passes per shell. The correction factor thus obtained is a function of number of shells N and terminal temperatures of the heat exchanger. The value of 'F' obtained from this new equation is in agreement with the value obtained from the graph. For a given correction factor 'F' and terminal temperatures of the heat exchanger, an equation for the estimation of number of shells has been derived, which is a function of correction factor 'F' and terminal temperatures of the heat exchanger.
机译：这个问题的目的是在设计热交换器的过程中分析LMTD校正因子“ F”的替代模型。为了分析热交换器的性能，可用的方法是LMTD和效率（°）。由于对数平均温度差（LMTD）校正因子'F'的表达式难以评估，因此传统的分析方法依赖于热交换器图表。除了仅适用于特定的热交换器外，这些图表都是高度非线性的，并以无量纲参数P和R表示。LMTD校正因子“ F”图表在陡峭区域特别难以阅读。在这项研究中，提出了一种用于根据两个无量纲参数P和R确定LMTD校正因子'F'的替代分析方法。这种新方法可得出一个通用的代数方程式，用于确定多通道管壳式换热器的LMTD校正因子，其中每个管壳具有任意数量的管壳通过，甚至每个管壳具有偶数管通过。如此获得的校正因子是壳数N和热交换器的终端温度的函数。从这个新方程式获得的“ F”值与从曲线图获得的值一致。对于给定的校正系数“ F”和热交换器的终端温度，已经得出了用于估计壳数的方程，该方程是校正系数“ F”和热交换器的终端温度的函数。

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