HEAT EXCHANGE SURFACE Russian patent published in 1998 - IPC

FIELD: heat engineering. SUBSTANCE: heat exchange surface consists of alternating tubes which are longitudinal washed with heat-transfer agents and are provided with wire loop fins 2 and tubes 3 with longitudinal fins which may be made in form of four groove-like fins 4 bent inside groove; they are located crosswise on tube 3 and their vertices are directed into spaces between wire loop fins 2 of adjacent tubes 1; fins may be made in form of four bent fins connected with tubes 3 in center portion of bending line; their curvature radius is equal to radius of circle of outer generatrix of wire loop fins 2 whose vertices are directed into spaces between wire loop fins of adjacent tubes 1; fins may consists of combination of four groove-like fins bent into inner cavity of grooves with vertices directed into spaces between wire loop fins 2 of adjacent tubes 1 and four bent fins connected with tubes 3 in center portion of bending line; their curvature radius is equal to radius of circle of outer generatrix of wire loop fins 2 with vertices directed into spaces between wire loop fins of adjacent tubes. Longitudinal fins 4 may be smooth or may be provided with artificial roughness in form of perforations, recesses, projections or knurling. EFFECT: intensification of heat exchange process between heat-transfer agents, reduced masses and overall dimensions. 6 cl, 3 dwg