Patent ID: 7296620

Claim:
A heat exchanger apparatus, comprising: an inlet header; an inlet connection connected to the inlet header; an outlet header; an outlet connection connected to the outlet header; and a plurality of serpentine tube bodies interconnecting and in communication with the inlet header and outlet header, each serpentine tube body having a plurality of straight tube sections and a plurality of U-shaped return bend sections, the plurality of straight tube sections arranged in a plurality of generally parallel rows, the plurality of return bend sections connected to the plurality of straight tube sections in a manner such that a respective one of the return bend sections connects sequential ones of the plurality of straight tube sections to form a serpentine configuration, each one of the straight tube sections and each one of the return bend sections having an elliptically-shaped cross-sectional configuration, the plurality of serpentine tube bodies arranged in a juxtaposed manner with consecutive ones of the serpentine tube bodies contacting each other to define an interfacing plane, and with respective ones of the plurality of straight tube sections and the plurality of return bend sections of one of the consecutive ones of the serpentine tube bodies and respective ones of the plurality of straight tube sections and the plurality of return bend sections of a next one of the consecutive ones of the serpentine tube bodies each being coexistent with the interfacing plane.