The pressure drop across the plate heat exchanger consists of four components; pressure drop due to acceleration of the fluid, due to change in elevation, due to inlet/exit manifolds, and due to friction inside the corrugated plate heat exchanger. Previous research shows that the magnitude of pressure drop due to acceleration of the fluid & due to change in elevation is very small as compared to frictional and port pressure loss. In this study only frictional and port pressure loss is considered. The friction factor [22] for both sides is given by