METHOD OF MANUFACTURE OF HEAT EXCHANGER APPARATUS WITH LONGITUDINALLY ORIENTED PASSAGES Russian patent published in 1994 - IPC

FIELD: heat engineering. SUBSTANCE: placed in the housing of the apparatus is bundle which has longer tubes with filler and shorter tubes with rod-shaped filler whose length is more than that of the shorter tubes; caps are fitted on the projecting ends; apparatus is also provided with additional rod fillers with the diameter of their center portion equal to the outer diameter of the tubes; caps are fitted on the ends of the lesser diameter. The housing is crimped till tight faying of the tube surfaces, caps and housing has been obtained. Then filler is melted out. EFFECT: enhanced efficiency. 2 cl, 4 dwg