Plate Heat Exchanger

Abstract

A plate heat exchanger comprising separate flow paths for two flows of fluid said paths having different pressure drops at equal mass flows may according to the invention be designed economically by stacking pairs of two plates ( 4, 5 ) provided with pressed patterns, at least one of the plates ( 4 ) in a pair ( 4, 5 ) being provided with at least two different press depths (D 1 , D 2 ), the smaller (D 2 ) being at least 40% of the greater (D 1 ).

1 . A plate heat exchanger comprising at least two separate flow paths for primary and secondary fluids to exchange heat, the said flow paths being substantial defined by permanently interconnected heat exchanger plates provided with a herring bone pattern of ridges and depressions and offering different pressure drops at equal mass flows of the two fluids, wherein the depressions in at least some pairs of plates defining the flow path having the lower pressure drop at least partly are alternatively of two different press depths (D 1 , D 2 ) measure from the plan define by the tops of the ridges of the herring bone patter the heat exchanger plate, the smaller (D 2 ) being located between two tops of the herring bone patter and being at least 40% of the greater (D 1 ), and thereby that the tops of the ridges engaging the tops of a neighboring plate to define a flow channel having high pressure drop substantially contact each other along points defined by crossing lines.