Patent ID: 6904963

Claim:
A heat exchanger comprising: a first end tank; a second end tank opposite the first end tank; a first tube in fluid communication with the first and second end tanks, the first tube adapted to have a first fluid flow therethrough, the first tube having a hydraulic diameter less than about 1.00 mm; a second tube in fluid communication with the first and second end tanks, the second tubes adapted to have the first fluid flow therethrough after the first fluid flows through the first tube, the second tube having a hydraulic diameter less than about 1.00 mm; wherein the first tube and second tube define a plurality of sub-passageways extending along a Length of the first tube and second tube wherein each of the sub-passageways of the first tube and second tube have a cross-sectional area perpendicular to the length of the first tube and second tube that is between about 0.02 mm 2 and about 1.00 mm 2 ; at least one fin contacting the first tube and the second tube, with the first and second tubes and the fins being generally co-planar relative to each other; wherein the heat exchanger is a single pass or two-pass exchanger, the fin height is less than or equal to about 10.0 mm and wherein the hydraulic diameter of the first tube or second tube is less than about 0.6 mm.