Shell and tube heat exchangers are the most common type of heat exchanger for many applications. As its name implies, this type of heat exchanger consists of a shell (a cylindrical pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell). Energy (in this case heat) transfers between the two fluids, though they never come in to direct contact.
The set of tubes is often referred to as a tube bundle, and may be composed by several types of tubes: plain, longitudinally finned, etc.
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