A single metal plate can have high or low tetra pattern which aids in efficient heat exchange between the liquids. These corrugated structure types create turbulence in the flow; creating much better heat exchange between the two media. The complete plate pack assembly is as such; that the hot medium flows on one side of a plate while cold flows on another. For better heat exchange between the medium via metal plate; the fluids flow in a counter concurrent direction. A plate type heat exchanger works on the simple principle of thermal conductivity and second law of thermodynamics. It basically consists of pack of plates with four ports for inlet and outlet of warm and cold medium. These warm and cold mediums flow through alternative channels; with different medium on opposite sides of the plate. The gasket along the corrugated plate structure protects the medium from intermixing or flowing to the wrong plate side.
