PURPOSE: To improve the heat transfer efficiency, by comprising channels which straighten fluid flowing in two, three dimensional manners and spirally into the clearance between parallel tubes, coupling a forming plate, which is used as a heat transfer fin in combination, with a tube bundle outer peripheral inter clearance partiton plate for tube supporting.

CONSTITUTION: Corrugated plates 3 are made to clamp the parallel rows of tubes in the clearance between parallel rows of staggered tubes 2 fixed to a tube shell 1 and a tube plate 6. The crest and bottom directions of the corrugates plates are alternately adapted to be tube axial directions 13 and 13', and the corrugated plates are inserted between the tube rows and brought into pressure contact with the tube surfaces and mounted to cylindrical shell-attached tube bundle outer periphery partition plates 5 and 5'. The fluid which has entered from a fluid inlet 8, passes through the tube bundles from the inner peripehery of the shell 1, and is brought into a resultant flow, combined into two and three dimensional manners to the corrugated plates intersected before and after the tube rows as shown by a line 12 respectively, and combined into two and three dimensional manners to the outer periphery of the tubes respectively as well, then the fluid flows out from a fluid outlet 7, thereby producing highly efficient heat transmission.