Heat exchanging plate and heat exchanger

A plate for a heat exchanger, arranged to heat exchange a first medium in gas phase to a second medium, so that the first medium condenses into liquid form, the plate being associated with a main plane of extension and a main longitudinal direction and comprising:

• a first heat transfer surface, extending substantially in parallel to said main plane and arranged to be in contact with the first medium, flowing along the first surface in a first flow direction parallel to the main longitudinal direction;
• and
• a second heat transfer surface, extending substantially in parallel to said main plane and arranged to be in contact with the second medium, flowing along the second surface in a second flow direction parallel to the main longitudinal direction,
• wherein the first surface comprises protruding ridges defining at least two parallel and open-ended channels extending in the first flow direction,
• wherein the second surface comprises a plurality of protruding dimples arranged in said channels between neighbouring respective pairs of said ridges,
• wherein a height, perpendicular to the main plane, of said ridges and dimples respectively define a first flow height for the first medium and a second flow height for the second medium, and
• a first set of ridges having at least three of said ridges immediately adjacent one another, each of the at least three of said ridges having a first interruption in at least one location spaced a first distance from a first side of the first surface and transverse to said first flow direction, each of the at least three of said ridges of the first set having a first section extending from the first side of the first surface to the first interruption, and
• a second set of ridges having at least three of said ridges immediately adjacent one another, each of the at least three of said ridges having a second interruption in at least one location spaced a second distance from the first side of the first surface and transverse to said first flow direction, the second distance being different than the first distance, at least one of the at least three of said ridges of the second set having a first section extending from the first side of the first surface to the second interruption,
• wherein the second surface comprises at least one protruding barrier structure extending in a direction substantially perpendicular to the second flow direction and arranged in the first interruptions of the first set of ridges, defining a penetrable barrier for the second medium.