Conduit device

A device for conducting a first fluid in heat transfer relationship with a second fluid, comprising a plurality of conduits each containing the first fluid;

• an outer pipe carrying the conduits and containing a second fluid flowing around the conduits;
• and a thread shaped element helically wrapped substantially around each of the conduits with the the element windings around each conduit longitudinally spaced from each other to cause the second fluid flowing around the conduit to perform a circulating motion, said element having substantially an entire length and a surface thereof in continuous contact with the conduit, said element being at least partially spaced apart from said outer pipe along a common longitudinal plane extending radially through the conduit, enabling fluid to flow therebetween, said conduits being substantially parallel to the longitudinal axis of said outer pipe and spaced apart from each other radially toward the outer pipe by means of the helically extending elements wherein said windings of each element are offset axially relative to corresponding windings provided on an adjacent conduit, said windings on one conduit thereby contacting an adjacent conduit to radially space adjacent conduits from each other in the outer pipe a distance substantially equal to the diameter of an element interposed therebetween, said windings defining a continuous clearance between adjacent conduits extending substantially the entire axial length of said elements, enabling second fluid flow between adjacent conduits through the continuous clearance.