Patent ID: 6959492

Claim:
A plate heat exchanger comprising: a pair of end plates; a plurality of first passageway plates each having a first passageway defined therein; a plurality of second passageway plates each having a second passageway defined therein; a plurality of partition plates, said plurality of first passageway plates and said plurality of second passageway plates being stacked in an alternating manner with one of said plurality of partition plates interposed between each adjacent first passageway plate and second passageway plate, and said first passageway of each of said first passageway plates and said second passageway of each of said second passageway plates being aligned, whereby a first fluid flowing through said first passageway of each of said first passageway plates flows in a manner that is countercurrent to a flow of a second fluid flowing through said second passageway of each of said second passageway plates; and a partition member arranged in only said first passageway of each of said first passageway plates so as to divide said first passageway into two sections with respect to a widthwise direction of said first passageway.