Heat transfer plate with heat transfer ridges having varying width

A heat transfer plate for a plate heat exchanger, the heat transfer plate having a transverse center axis and comprising a first distribution area, a heat transfer area and a second distribution area arranged in succession along a longitudinal center axis of the heat transfer plate extending perpendicular to the transverse center axis of the heat transfer plate, the heat transfer area being provided with a heat transfer pattern differing from a pattern within the first and second distribution areas, the first distribution area adjoining the heat transfer area along an upper borderline, and the second distribution area adjoining the heat transfer area along a lower borderline, wherein the heat transfer pattern comprises elongate alternately arranged heat transfer ridges and heat transfer valleys extending obliquely in relation to the transverse center axis of the heat transfer plate, a respective top portion of the heat transfer ridges extending in a top plane and a respective bottom portion of the heat transfer valleys extending in a bottom plane, which top and bottom planes are parallel to each other, a center plane extending half-way between, and parallel to, the top and bottom planes defining a border between the heat transfer ridges and the heat transfer valleys, wherein the heat transfer ridges comprise ridge contact areas within which the heat transfer ridges are arranged to abut an adjacent first heat transfer plate in the plate heat exchanger, and the heat transfer valleys comprise valley contact areas within which the heat transfer valleys are arranged to abut an adjacent second heat transfer plate in the plate heat exchanger, wherein, within at least half of the heat transfer area, the top portions of the heat transfer ridges have a first width w1, and the bottom portions of the heat transfer valleys have a second width w2, a width of the top and bottom portions being measured perpendicular to a longitudinal extension of the heat transfer ridges and heat transfer valleys, and w1≠w2, the top portion of a number of first heat transfer ridges of the heat transfer ridges, within a respective first ridge contact area of the ridge contact areas, having a third width w3, wherein, if w1>w2 then w3<w1, and, if w1<w2 then w3>w1, wherein the first ridge contact areas are comprised in a respective end portion of the first heat transfer ridges, which end portion extends from one of said upper and lower borderlines, the heat transfer ridges including several heat transfer ridges whose top portions each have:

• i) one section having the width w1;
• and ii) another section having the width w3.

A heat transfer plate for a plate heat exchanger, the heat transfer plate having a transverse center axis and comprising a first distribution area, a heat transfer area and a second distribution area arranged in succession along a longitudinal center axis of the heat transfer plate extending perpendicular to the transverse center axis of the heat transfer plate, the heat transfer area being provided with a heat transfer pattern differing from a pattern within the first and second distribution areas, the first distribution area adjoining the heat transfer area along an upper borderline, and the second distribution area adjoining the heat transfer area along a lower borderline, wherein the heat transfer pattern comprises elongate alternately arranged heat transfer ridges and heat transfer valleys extending obliquely in relation to the transverse center axis of the heat transfer plate, a respective top portion of the heat transfer ridges extending in a top plane and a respective bottom portion of the heat transfer valleys extending in a bottom plane, which top and bottom planes are parallel to each other, a center plane extending half-way between, and parallel to, the top and bottom planes defining a border between the heat transfer ridges and the heat transfer valleys, wherein the heat transfer ridges comprise ridge contact areas within which the heat transfer ridges are arranged to abut an adjacent first heat transfer plate in the plate heat exchanger, and the heat transfer valleys comprise valley contact areas within which the heat transfer valleys are arranged to abut an adjacent second heat transfer plate in the plate heat exchanger, wherein, within at least half of the heat transfer area, the top portions of the heat transfer ridges have a first width w1, and the bottom portions of the heat transfer valleys have a second width w2, a width of the top and bottom portions being measured perpendicular to a longitudinal extension of the heat transfer ridges and heat transfer valleys, and w1≠w2, the top portion of a number of first heat transfer ridges of the heat transfer ridges, within a respective first ridge contact area of the ridge contact areas, having a third width w3, wherein, if w1>w2 then w3<w1, and, if w1<w2 then w3>w1, the first heat transfer ridges in which the top has the third width w3 extend from one of said upper and lower borderlines, several of the heat transfer ridges having the top portions within the at least half of the heat transfer area and possessing the width w1 also including a section outside the at least half of the heat transfer area and possessing the width w3.