Patent ID: 7836944

Claim:
A multi-channel flat tube for heat exchangers comprising: a first channel section including at least one channel formed therein passable by a fluid; a second channel section including at least one channel formed therein passable by a fluid; a region of reduced heat transmission disposed between said first channel section and said second channel section, wherein said region of reduced heat transmission is formed by a constriction including a first elongate slot and a second elongate slot, the first elongate slot and the second elongate slot each disposed along an entire length of the multi-channel flat tube, the first elongate slot formed in a first side of the multi-channel flat tube and the second elongate slot formed in a second side of the multi-channel flat tube opposite the first elongate slot; a first isolating channel disposed in said region of reduced heat transmission, wherein said first isolating channel is an elongate conduit disposed along the entire length of the multi-channel flat tube between the first elongate slot and the second elongate slot, and wherein a material cross-section at said region of reduced heat transmission along the multi-channel flat tube reduced by the constriction and the first isolating channel is substantially constant along the entire length of the multi-channel flat tube.