Abstract: Plate heat exchanger in the form of heat exchanger plates having several corrugated heated surfaces (4) arranged next to one another and tightly sealed with one another, and with two flow paths (10, 11) separated from one another where one of the flow paths (10) has a larger cross-sectional flow through than the other flow path (11), whereby the heat exchanger consists of a number of identically formed plates with an asymmetric cross-sectional shape seen in relation to the central plane (5) of the plate, the lower surface of the grooves of the gasket are located in the central plane of each respective plate, the same sides of every other plate (8) are turned to face the same direction in the heat exchanger, and the equivalent sides of the other plates (9) are turned to face the opposite direction.

Abstract: In a three-circuit plate heat exchanger comprising a stack of metal plates (16-25) having identical outer shape and dimensions provided with six holes forming inlet and outlet ports (2-7) for three flows of fluid (x, y and z). The plates are of two different designs, the first (those plates having even reference numerals) having two holes located in plate areas in a common plan and the remaining holes located in a common plan displaced downwards. In the other plate design (the remaining heat exchanging plates) the corresponding four holes are displaced equally upwards relative the remaining two holes. The two types of plates are alternating in the stack. Ring-shaped spacers (27, 28) are sealingly arranged between such plates which are spaced from each other at port holes and forming channels between plates to be blocked from connection with ports forming said holes.

Abstract: A plate heat exchanger for two or more flowing media may according to the invention be designed so that the front and rear cover plates (1, 8) of the exchanger act as channel defining walls for a flowing heat exchanging medium, and so that the tube connections at the inlet and outlet ports (10-13) can be established in a common plane. This is obtained thereby that the front and rear cover plates (1, 8) together with the adjacent first (2) and last (5) channel forming plates define distribution channels (18) crossing the direction between adjacent inlet and outlet ports.