Patent ID: 8272233

Claim:
A heat exchanger comprising: a first flat tube having a flat shape and through which a low temperature fluid flows; a second flat tube having a flat shape and through which a high temperature fluid flows; a first inlet header and a first outlet header respectively connected to first and second ends of the first flat tube; and a second inlet header and a second outlet header respectively connected to first and second ends of the second flat tube, wherein the first flat tube and the second flat tube are laminated and arranged in at least three laminated layers so that the first flat tube and the second flat tube are in contact with each other on flat surfaces, flow direction of the low temperature fluid in the first flat tube intersects, at a right angle, flow direction of the high temperature fluid in the second flat tube, at least one of the first flat tube and the second flat tube includes a plurality of flat tubes arranged along the flat surface or arranged in the direction of lamination, and the first and second inlet and outlet headers are respectively connected to ends of the first and second flat tubes, forming parallel passages.