Heat exchanging plate and heat exchanger

Abstract

A plate for a heat exchanger between a first medium and a second medium, with a main plane of extension and a main longitudinal direction includes a first heat transfer surface, parallel to said main plane and in contact with the first medium; and a second heat transfer surface, parallel to said main plane and in contact with the second medium. The first surface includes a first medium inlet region, a first medium transfer region and a first medium outlet region including a first medium outlet port. The second surface includes a second medium inlet region, a second medium transfer region and a second medium outlet region, which second medium inlet region overlaps with the first medium outlet region and includes a second medium inlet port not overlapping, with the first medium outlet port. The first medium outlet region includes a protruding ridge extending from a respective edge of the first surface and perpendicularly to the longitudinal direction, and the protruding ridges form a barrier system for the first medium and define a channel along which the first medium is forced to travel, which channel runs first towards, then around and thereafter away from the second medium inlet port.