Patent ID: 6959758

Claim:
A heat exchanger for transferring heat between first and second fluid flows, the heat exchanger comprising: a plurality of flattened, first heat exchange tubes to direct the first fluid flow through the heat exchanger, each first tube including at least a first pair of substantially parallel, spaced tube runs connected by a bend in the first tube, the first pairs of tube runs being substantially aligned with each other; a plurality of flattened, second heat exchange tubes to direct the second fluid flow through the heat exchanger, each second tube including at least a second pair of substantially parallel, spaced tube runs connected by a bend in the second tube, the second pairs of tube runs being substantially aligned with each other and substantially perpendicular to the first pairs of tube runs; one of the tube runs of each of the second tubes being sandwiched between the tube runs of each first pair of tube runs of the first tubes, and one of the tube runs of each of the first tubes being sandwiched between the tube runs of each second pair of tube runs of the second tubes.