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Some heat exchanger advertises the availability of finned tubes in a hairpin or double pipe heat exchanger.

A hairpin heat exchanger may have only one inside the pipe, or it may have multiple inside tubes, but it will always have the doubling back feature. The term ‘hairpin heat exchanger’ is also used for a heat exchanger of the configuration in the diagram. The pipes are usually doubled back multiple times as shown in the diagram at the left, in order to make the overall unit more compact.

The wall of the inner pipe is the heat transfer surface. One fluid flows through the inside pipe and the other flows through the annulus between the two pipes. Working: A double pipe heat exchanger, in its simplest form, is just one pipe inside another larger pipe. However, due to the need for removable bundle construction and the ability to handle differential thermal expansion while avoiding the use of expansion joints (often the weak point of the exchanger), the current U-shaped configuration has become the standard in the industry. In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a pipe, usually of a straight-leg construction with no bends. Hairpin heat exchangers (often also referred to as “double pipes”) are characterized by a construction form which imparts a U shaped appearance to the heat exchanger. Classification according to the phase of the fluid. Classification according to a number of fluids:ħ.