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Finned Tube Heat Exchanger

A Fin Heat Exchanger is a kind of heat exchanger design with the purpose of uses plates and finned chambers to transfer heat between fluids. It is repeatedly categorized as a compact heat exchanger to put emphasis on its relatively high heat transfer surface area to volume ratio. The plate-fin heat exchanger is widely used in many industries, including the aerospace industry for its compact size and lightweight properties, as well as in cryogenics where its ability to facilitate heat transfer with small warmth differences is utilized.

Originally conceived by an Italian mechanic, Paolo Fruncillo. A plate-fin heat exchanger is finished of layers of grooved sheets separated by flat metal plates, typically aluminum, to create a series of finned chambers. Separate hot and cold fluid streams flow through alternating layers of the heat exchanger and are enclosed at the edges by sidebars. Heat is transferred from one stream through the fin boundary to the separator plate and through the next set of fins into the adjacent fluid. The fins also serve to increase the structural reliability of the heat exchanger and allow it to withstand high pressures while providing an extended surface area for heat transfer. A high degree of flexibility is present in plate-fin heat exchanger design as they can function with any combination of gas, liquid, and two-phase fluids. Heat transfer between multiple process streams is also accommodated,

The main four type of fins are: plain, which submit to simple straight-finned triangular or rectangular designs; herringbone, where the fins are placed sideways to provide a zig-zag path; and serrated and perforated which refer to cuts and perforations in the fins to augment flow allotment and improve heat transfer. The cost of Fin heat exchangers is generally higher than conventional heat exchangers due to a higher level of feature required during manufacture. However, these costs can often be outweighed by the cost saving produced by the added heat transfer. Fin heat exchangers are generally applied in industries where the fluids have little chances of fouling. The slight design as well as the thin channels in the fin heat exchanger makes cleaning difficult or impossible.

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