HEAT-EXCHANGE TUBE Russian patent published in 2004 - IPC

FIELD: heat-exchange systems of heat supply in chemical, petroleum, food industries. SUBSTANCE: the invention has a heat-exchange tube provided with profiled grooves on the outer surface, and mating smoothly outlined bulges on the inner surface applied with a definite spacing, width and depth, several tubes are collected in a bundle and fastened in tube plates, and each tube is additionally provided on the outer surface with an artificial roughness arranged in rows parallel with the tube longitudinal axis, and in the tube circumference; the tube ends have no grooves at distance l= K+20 mm, and have no artificial roughness inside it and outside at distance l₁ = K+10 mm; the spacing of the heat-exchange tubes in a bundle (s) is determined by relation , where K-thickness of the tube plate, mm; Д_out-outside diameter of the heat-exchange tube, mm. EFFECT: intensified heat exchange on the outer and inner surfaces of the heat-exchange tube and enhanced serviceability of it. 2 dwg