Heat exchanger plate and heat exchanger

Abstract

Plate () for a heat exchanger () between a first medium and a second medium, the plate comprising a first heat transfer surface () on a first side () of the plate, arranged to be in contact with the first medium; a second heat transfer surface () on a second side () of the plate, arranged to be in contact with the second medium; a plurality of indentations () in the plate (), bulging out locally in a plate height direction (H), which plate is arranged to be stacked together with similar plates to form a heat exchanger heat plate stack. The invention is characterised in that the plate comprises a ridge-shaped indentation, arranged to form, together with a corresponding ridge-shaped indentation of an adjacent plate in said stack, a closed flow channel (″) for the first medium with a general flow direction, in that the said closed channel comprises a floor () and a ceiling (), as viewed in the height direction, and comprises a step () in the height direction along said general flow direction by the said floor and said ceiling both being offset in same height direction.