The present invention is a plate heat exchanger for heat transfer between two
fluids, having several thin heat transfer plates (1) abutting towards each
other and between the heat transfer plates (1) arranged sealing members
(6), which in alternate plate interspaces delimit a flow space for a first
fluid and in the remaining plate interspaces delimit flow spaces for a second fluid,
each heat transfer plate (1) having a pressed corrugation pattern, which
has two distribution portions (7, 8) and, arranged between these, a main
heat transfer portion (9), which is divided in several areas (10a,
10b) with parallel ridges and valleys, and the plate heat exchanger
having inlets and outlets for the fluids, arranged such that the fluids will have
a flow direction between the heat transfer plates (1) essentially from one
to the other of the distribution portions (7,8) at each heat transfer plate.
According to the invention the heat transfer portion (9) of each heat transfer
plate (1) has a row with at least three areas (10a, 10b)
located after each other in the flow direction and an even number of such rows
are arranged next to each other across the flow direction, by which the parallel
ridges and valleys of each pair of adjacent areas (10a, 10b)
extend in such a way that they form mirror images of each other with reference
to an imaginary line between respective areas (10a, 10b).
