Patent ID: 6164371
Filing Date: 2000-12-26
Classification: F28D

Abstract:
A plate heat exchanger for refrigeration applications for three heat exchanging fluids which heat exchanger comprises at least one core of plates with heat exchanging plates (31-38), at least two end plates (5) and inlets and outlets (6) for the heat exchanging fluids,the heat exchanging plates being provided with port holes (17-23, 23', 24, 24', 28, 29) creating inlet channels and outlet channels through the core of plates for the fluids, the channels for one fluid being in fluid communication with every other plate interspace and the channels for each one of the remaining two fluids being in alternating fluid communication with every other of the remaining plate interspaces andthe heat exchanging plates (31-38) are each provided with one or several corrugations (7) vertically extending within an area restricted by two parallel first and second planes respectively at a distance to each other together creating the thickness restriction of the plate and both substantially in parallel with all the plates (31-38) in the core of plates as well as with the end plates (5) of the plate heat exchanger whereby the first plane is closer to a first end plate (5) in one end of the heat exchanger than the second plane is and the second plane is closer to a second end plate (5) in the other end of the heat exchanger than the first plane is,whereinthe heat exchanging plates (31-38) are present in four different forms of execution alternating within the core of plates in such a way that a plate (31, 35) of a first form of execution is mounted close to a plate (32, 36) of a second form of execution and a plate (34, 38) of a fourth form of execution,a plate (32, 36) of the second form of execution is mounted close to a plate (33, 37) of a third form of execution and a plate (31, 35) of the first form of execution,a plate (33, 37) of the third form of execution is mounted close to a plate (34, 38) of the fourth form of execution and a plate (32, 36) of the second form of execution anda plate (34, 38) of the fourth form of execution is mounted close to a plate (31, 35) of the first form of execution and a plate (33, 37) of the third form of execution andthe port holes (17, 18, 20, 21, 23, 23', 24, 24') for each one of the two remaining fluids create at least two inlet channels through the core of plates which, for each one of the fluids, are in fluid communication with each other at a plurality of places along the inlet channels in such a way that the fluid, on its way from one inlet channel to plate interspaces aimed therefore, is forced to flow through another inlet channel.