Shell and tube heat exchangers are crucial for marine engine cooling, providing an efficient solution to dissipate the excessive heat generated by marine engines. These heat exchangers consist of a series of tubes (the tube bundle) enclosed in a cylindrical shell. Coolant (usually seawater) flows through the shell, while engine coolant circulates through the tubes. The heat from the engine coolant is transferred to the seawater, effectively lowering the temperature of the engine coolant before it is recirculated back into the engine. This process ensures that marine engines operate within safe temperature limits, thereby optimizing performance and preventing overheating. The robust design and high heat transfer efficiency of shell and tube heat exchangers make them ideal for the demanding conditions of the marine environment.