Tube winding for a gas heat exchange cell for a boiler

Abstract

A tube profile (), in particular for manufacturing a heat exchanger for a condensing boiler, wherein the cross-section () of the tube profile () comprises: a rectangular portion () having two greater sides () parallel to each other and two smaller sides () parallel to each other and orthogonal to the greater sides (), and an ogival portion () defined by a convex flat figure formed by a base () and two curved sides () connected to each other in an apical zone () opposite to said base, wherein said base () coincides with a first side () of said two smaller sides () of the rectangular portion (), wherein said two curved sides () are symmetrical to an axis of symmetry (S-S) parallel to said greater sides () and passing through the central points () of said smaller sides (), wherein one end of each of said two curved sides () joins to one end of a respective one of said two greater sides ()) in a first joining point (PH), said each of said two curved sides () being tangent to said respective one of said two greater sides () in said first joining point (PH), and wherein an overall dimension of said ogival portion (HO) measured along said axis of symmetry (S-S) is greater than the length of said base (); wherein the two greater sides (), a second side of said two smaller sides (), and said two curved sides (), define the outer surfaces () of the walls of said tube profile ().