Plate heat exchangers are used to transfer heat from one fluid to another when cross contamination needs to be avoided. A plate heat exchanger is made out of several thin metal plates that are stacked or brazed in parallel to each other and formed into a hollow metallic shell. Each plate usually consists of different pressed patterns that are surrounded with gaskets to control the fluid flow and produce turbulence for better heat transfer. The gaskets are arranged in such a way that allows only one type of fluid to flow through one gap, while the other fluid gets directed through the adjacent gap. between every two consecutive plates a space or passage has been implemented that makes the hot and cold fluids flow along and through the plane of the plates.
