Shell and tube heat exchangers are a crucial component in various industrial processes, particularly for preheating. These devices consist of a series of tubes, one set carrying the fluid that needs to be heated (or cooled), and another set carrying the heating (or cooling) medium. The heat exchange occurs as these two fluids pass through the tubes, separated by the tube walls, facilitating efficient thermal energy transfer. Preheating with shell and tube heat exchangers helps optimize energy consumption, improve process efficiency, and reduce operational costs by utilizing waste heat or less expensive energy sources to elevate the temperature of incoming fluids before they enter the main process.