Shell and tube heat exchangers consist of a series of tubes (the tube bundle) enclosed within a cylindrical shell. One fluid flows through the tubes while another fluid flows around the tubes within the shell, allowing heat transfer between the two fluids. This efficient heat exchange mechanism is widely used to add heat to various fluids in different industrial applications. For instance, steam generators use shell and tube heat exchangers to convert water into steam by transferring heat from a hot fluid to the water. Reboilers, another application, use these exchangers to provide the necessary heat to a liquid to form vapor in distillation processes. Other heating applications include bayonet heaters, which extend into a tank and transfer heat to the fluid inside, and thermal fluid heaters, which circulate a thermal oil or fluid through the tubes to transfer heat to a process fluid. Preheaters and suction heaters also utilize shell and tube designs to increase fluid temperatures before further processing or pumping. The versatility and efficiency of shell and tube heat exchangers make them invaluable in heating applications across various industries.