Do you know shell and tube heat exchangers ？

Shell and tube heat exchanger is also called tube heat exchanger. 

It is a wall heat exchanger with the wall surface of the tube bundle enclosed in the shell as the heat transfer surface. 

This heat exchanger is simple in structure, reliable in operation, can be made of various structural materials (mainly metal materials), can be used at high temperature and high pressure, and is the most widely used type at present.