Patent ID: 9103597
Filing Date: 2015-08-11
Classification: F28D,F28F

Abstract:
1. A plate heat exchanger comprising a plurality of heat exchanger plates, which are made through forming of a metal sheet and are provided beside each other and permanently joined to each other by a braze material to form a plate package having first plate interspaces configured to accommodate a first medium and second plate interspaces configured to accommodate a second medium, at least one of the first medium and the second medium being carbon dioxide, wherein each heat exchanger plate has a pattern forming a heat transfer area, a plurality of porthole areas, each porthole area surrounding a respective porthole defined by a porthole edge, wherein each heat exchanger plate defines a longitudinal centre line and wherein the heat transfer area comprises ridges and valleys arranged in such a manner that the ridges of one of the heat exchanger plates abut the valleys of an adjoining one of the heat exchanger plates to form a plurality of joining areas, wherein each heat exchanger plate extends along a main extension plane, wherein said heat transfer area and said porthole areas, on one side of the heat exchanger plate, extend between an upper, primary level at a distance from the main extension plane and a lower, secondary level at a distance from and on an opposite side of the main extension plane, wherein each heat exchanger plate has a depth defined by the distance between the upper, primary level and the lower, secondary level, wherein the depth is equal to or less than 0.90 mm, wherein the ridges are disposed at a distance from and extend in parallel with each other, and wherein the distance between adjacent ridges on the heat transfer area is less than 4 mm.