A plate fin heat exchanger is a type of heat exchanger that uses a series of flat, rectangular plates with fins attached to them. The fins increase the surface area of the plates, allowing for efficient heat transfer between two fluids.
The two fluids flow through alternating channels formed by the plates. One fluid flows through the channels formed by the fins, while the other flows through the channels formed by the flat plates. This arrangement creates a large surface area for heat transfer, resulting in efficient heat exchange between the two fluids.