Plate heat exchanger

A plate heat exchanger in which a first fluid is cooled by a second fluid, comprising:

• a plurality of stacked heat exchanger plates forming flow channels therebetween, the plates having a plurality of aligned openings defining inlet and outlet channels each communicating with selected ones of the flow channels;
• at least one upper plate and at least one lower plate on opposite sides of the stacked plates;
• a first conveying channel at least partially defined by one of said upper and lower plates, the first conveying channel guiding one of said first and second fluids to a desired position along the length of said heat exchanger;
• and
• a second conveying channel at least partially defined by another of said upper and lower plates, said second conveying channel being a transfer channel for guiding the other of said first and second fluids to a desired position along the length of said heat exchanger.