Design of Shell and Tube Heat Exchanger Using MATLAB and Finding the Steady State Time Using Energy Balance Equation

摘要

Design of shell and tube heat exchangers are done by formulating a standard procedure where the parameters required for building a HX is calculated using numerical method until the dimensions satisfy the condition for maximum overall heat transfer coefficient, this is done using a MATLAB code in which the calculations are iterated by varying the TEMA specified values for tube length and tube outer diameter. The output of this calculation is proposed to be the effective parameters for design of shell and tube heat exchanger for given boundary conditions. Energy balance over the heat exchanger for the designed HX was completed using partial differential equations, which was solved using second order Runge-Kutta method. Since Runge-Kutta method is very robust and efficient, so thermal diffusion term is not included in the energy balance equation. By plotting a temperature v/s tube length graph in MATLAB using the energy balance differential equation and analyzing the same, time required for the shell and tube heat exchanger to reach a steady state condition is obtained. The present work proposes a standard steps to design and analyze the working and performance of a shell and tube heat exchanger.