TUBELESS HEAT EXCHANGER Russian patent published in 1997 - IPC

FIELD: heat exchange apparatus where increase of outer and inner surfaces is required. SUBSTANCE: fins located in inner passages formed in plates by holes with beads are secured on generatrix surface of these passages, thus forming-through channels which may be oriented rectilinearly along longitudinal axis of inner passage or helically relative to this axis. Shape of flow-through channels changes along longitudinal axis of inner passage at maintained constant area of their cross section. EFFECT: enhanced efficiency. 4 cl, 8 dwg