Consider the following diagram of a counter current Shell and tube heat exchanger. The length of the heat exchanger is divided into nine equal intervals, defined by grid 1 to 10. The temperature at 1st, 4th, 7th and 10th grid is mentioned with time for both shell and tube during the experiment.
Material Of Construction :
The selection of material for the shell depends upon the corrosiveness of the fluid and other things like temperature, pressure etc. The carbon steel is a common material for the shell under moderate working conditions.
Tube Material :
To transfer heat well, the tube material should have good thermal conductivity. As heat is transferred from hot to the cold side through the tubes, there is a temperature difference through the width of the tubes. A thermal stress occurs during this operation because the tube material expands differently at various temperatures. The tube material should also be compatible with bothshell and tube side fluids for long periods under the operating conditions like temperature, pressure etc. to minimize deterioration such as corrosion.