https://nichefpp.com/blogs/how-does-a-shell-and-tube-heat-exchanger-work/

Shell and Tube heat exchangers are a specific kind of heat exchanger that include bundles of precisely spaced tubing compressed within a sizable cylindrical casing, or shell. Heat exchange is the process of transferring heat from one similar material or medium to another. Shell and tube heat exchangers are the most common type of heat exchanger design. They are categorized based on things like their performance qualities, tube type, material of construction, and other traits.