Reboiler-condenser with boiling and condensing surfaces enhanced by extrusion

Claim 1

A heat exchanger for reboiler-condenser service which comprises: a plurality of extruded passageways of a thermally conductive material comprising one or more internal longitudinal channels, means for condensate film thinning on all surfaces of said internal longitudinal channels, and means for promoting boiling on only two opposing exterior surfaces of the extruded passageway assembled in individual stacks, with said exterior without the means for promoting boiling of each of passageways juxtaposed to that of its neighbor, a plurality of stacks assembled in side-by-side relationship with said enhanced exterior boiling surface of said stack facing the means for promoting boiling of its neighboring stack, the individual stack of passageways is so assembled so that the longitudinal axes of said passageways are inclined from the horizontal without being vertical, thereby defining downward sloping condensing channels, with interposing support bars interposed between the exterior means for promoting boiling of neighboring stack of passageways; said support bars facing each other being vertical thereby defining vertical boiling channels; means for joining said support bars and passageways; and means for closing vertical edges between alternating pairs of passageways wherein the means for promoting boiling face each other.