Shell and tube heat exchangers
One fluid runs through the tubes, and another fluid flows over the tubes to transfer heat between the two fluids is known as Shell and Tube heat exchangers. The set of tubes is called a tube bundle, and may be composed by several types of tubes: plain, longitudinally finned, etc. Shell and tube heat exchanger is most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higher-pressure applications.