Heat exchanger

Abstract

Heat exchanger () for heat exchange between a first medium and a second medium, comprising a main inlet () and a main outlet () for the first medium; and a plurality of heat exchanging plates (), each of which comprising a plate inlet () and a plate outlet () for the first medium; and a respective first heat transfer surface () on a first side () and arranged to be in contact with the first medium flowing along said first side; a respective second heat transfer surface () on a second side () and arranged to be in contact with the second medium flowing along said second side; a respective plurality of indentations (); wherein the plates are fastened together in a stack, comprising plates of a first type () and plates of a second type () arranged alternatingly, whereby corresponding ones of said indentations of adjacent plates are arranged in direct abutting contact with each other, so that flow channels () for said first and second media are formed between said surfaces. The invention is characterised in that each plate of the first type comprises a respective ridge-shaped indentation (), arranged to form a closed flow first medium channel (), in that each plate of the first type comprises a respective bridge-shaped indentation (), formed to comprise a through hole () arranged to form an open flow channel () for the second medium, and in that said open flow channel communicates with corresponding open flow channels between other pairs of first and second type plates.