Shell and tube heat exchangers shell side flow and tube side flows explained

 Shell side flow and tube side flows explained 

This is model of 1-2 shell and tube heat exchanger :- that means 1 shell side pass and two tube side pass of flows in this exchanger.

Shell and tube heat exchanger has two different compartments called as

1) shell compartment and

2) Tube compartment

These compartments do not allow mixing of fluids / gas / media flowing in each individual compartment . Thus we have two different passes called as shell side pass and tube side pass.

As name suggest heat is exchanged between two fluids - In a shell and tube heat exchanger, heat is exchanged primarily through the principles of conduction and convection.

Conduction occurs through the solid walls of the tubes and the shell. Heat from the hot fluid inside the tubes is conducted through the tube walls to the cooler fluid outside the tubes, or vice versa.

Convection takes place within the fluids themselves. As the hot fluid flows through the tubes and the cooler fluid flows around the tubes in the shell, heat is transferred between the fluids through the process of convection.

Overall, the combination of conduction through the solid walls and convection within the fluids facilitates the exchange of heat in a shell and tube heat exchanger.

Above pictures shows how it is , if still in doubt feel free to ask !