One of the most common types of heat exchanger designs is the shell and tube heat exchanger. It is mostly utilized in large-scale chemical operations like oil refineries. It works well in high-pressure situations. As the name suggests, it is made up of a large shell that is enclosed by a collection of tubes. Actually, the shell serves as a large pressure vessel. To transfer heat between the two fluids, two fluids are flowing simultaneously: one through the tubes, the other over or through the shell. The term "tube set" refers to a collection of tubes that may include plain, longitudinally finned, or other sorts of tubes. Applications involving pressures greater than 30 bar and temperatures greater than 2600C typically call for the usage of shell and tube heat exchangers. Their substantial shape makes this possible. The heat exchanger is surrounded by two fluids that have different temperatures. One fluid, known as tube side fluid, moves through the tubes, and another, known as shell side fluid, moves through the shell. Heat is transported from one fluid to the other's tube walls, either from the tube's side to the shell's side or the other way around. On either the shell or the tube side, the fluids might be either liquids or gases. The heat transfer area should be vast in order to transfer heat effectively, necessitating the usage of several tubes.