Alfa Laval Corporate Ab

Fredrik Andreasson

Magnus Svensson

Rolf Christensen

Håkan Larsson

Rolf Bermhult

Martin Ross

Fredrik STRÖMER

A plate heat exchanger includes a plurality of heat exchanger plates formed of a metal sheet and permanently joined to each other by means of a braze material to form a plate package having first plate interspaces and second plate interspaces. Each heat exchanger plate has a pattern forming a heat transfer area and a plurality of porthole areas. Each heat exchanger plate extends along a main extension plane. The areas extend, on one side of the heat exchanger plate, between a primary level at a distance from the main extension plane and a secondary level at a distance from and on an opposite side of the main extension plane. Each heat exchanger plate has a depth defined by the distance between the primary level and the secondary level. The depth is equal to or less than 1.0 mm.

Plate heat exchanger

A plate heat exchanger including a plurality of heat exchanger plates joined to each other. Each plate has a heat transfer area, a first porthole area, a second porthole area, a third porthole area and a fourth porthole area. Each porthole area surrounds a porthole having a porthole edge. Each porthole area comprises an annular flat area, a set of inner portions on the annular flat area along the porthole edge, and a set of outer portions along the annular flat area at a distance from the inner portions. The outer portions of the first porthole area have a first relative peripheral position with respect to the inner portions. The outer portions of the fourth porthole area have a second relative peripheral position with respect to the inner portions. The first relative peripheral position includes a peripheral displacement in relation to the second relative peripheral position.

A plate heat exchanger includes a plurality of heat exchanger plates. The plates are provided beside each other and permanently joined to each other to form a plate package having first plate interspaces and second plate interspaces. Each plate has a heat transfer area and four porthole areas defined by a porthole edge. Each of the porthole areas includes an annular flat area located at one of a primary and secondary level, and a set of inner portions on the annular flat area at the other of the primary and secondary level. Each inner portion has an inner part adjoining the porthole edge and an outer segment adjoining the inner part and having an angular extension of at least 180&#xb0;. The outer segment has a continuous contour and a radius R, which is allowed to vary within the range 0.8R&#x2266;R&#x2266;1.2R.

A plate heat exchanger including a plurality of heat exchanger plates (), a first end plate and a second end plate. The plates are permanently joined to each other by means of a braze material. Each heat exchanger plate has a heat transfer area and a plurality of porthole areas surrounding a respective porthole. The plate heat exchanger including a plurality of having a bottom surface turned towards the heat exchanger plates. At least one of the flat elements including an annular protrusion extending from the bottom surface and tightly abutting one of the porthole areas of the outermost heat exchanger plate.

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Södra Sandby, Sweden

Fredrik Andreasson