HEAT EXCHANGE SURFACE Russian patent published in 1995 - IPC

FIELD: air conditioning, heating, cooling of electrical equipment heat exchange facilities. SUBSTANCE: heat exchange surface has members in form of flat tubes with rectangular section longitudinal inner channels installed in parallel rows. Longitudinal ribs are provided on end face surfaces of tubes. Walls of larger sides of tubes extend beyond its limits. Made on surface of these sides are external cross lobe ribs which form curved chutes. Arc of base of chutes of odd rows is described with radius from point located on longitudinal rib at side of inlet of heat carrier flow, and in even rows, from point located on opposite ends of tubes. Lobes have bevels arranged at obtuse angle relative to direction of heat carrier flow. EFFECT: enhanced heat exchange. 2 dwg