Abstract: A heat exchanger includes a body 4 on the surface of which are provided helical or spiral paths 5 which will provide multiple and turbulent flow paths A for a first fluid such as water which is caused to flow through chamber 3 relative to a spirally wound heat exchange tube 6 and in a heat transfer relationship with a second fluid flowing through the tube 6. The tube 6 has one or more further helical or spiral flow paths 9 on its external surface. The multiple flow paths A will extend the residence time for the first fluid within the heat exchanger 1 and this together with the turbulence will maximise heat transfer. Preferably a portion of the first fluid flow will be through a central aperture in body 4 where turbulence is also created by the helical or spiral paths of the tube 6 as it extends through the aperture.
Type:
Grant
Filed:
January 29, 2004
Date of Patent:
October 6, 2009
Assignee:
Energy Saving Concepts Limited
Inventors:
Murray James Kite, Rodney Mitchell Innes
Abstract: This invention concerns the manufacture of helically corrugated conduit having at least a portion of its length corrugated in the form of at lease one helix. The method includes the driving of a smooth walled tube into a forming head having forming wheels which engage the outside of the tube and the wheels are at an angle relative to the longitudinal axis of the tube. The forming wheels form the helical spiral as part of a cold rolled forming process. More than one helical spiral can be formed simultaneously using a multiplicity of forming wheels.