Estimating Number Of Shells And Determining
The Log Mean Temperature Difference Correction
Factor Of Shell And Tube Heat Exchangers
Author(s)
S. K. Bhatti, Ch. M. Krishna, Ch. Vundru, M. L. Neelapu
& I. N. Niranjan Kumar
Abstract
This problem aims at developing a practical and computational tool for LMTD
Correction Factor ‘F’ and approximate number of shells in the process of
designing a shell and tube heat exchanger.
In order to analyze the performance of heat exchanger the available
approaches are LMTD and effectiveness ε . 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, a simplified analytical approach for determining
LMTD correction factor ‘F’ in terms of two non-dimensional parameters W 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. This eliminates all the former cumbersome iterative methods in
which values are to be assumed for some factors.
Keywords: LMTD correction factor, shell and tube heat exchange, multipass
heat exchanger.
Keywords
LMTD correction factor, shell and tube heat exchange, multipass
heat exchanger.
Related Book
Other papers in this volume
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