Patent ID: 7597136
Filing Date: 2009-10-06
Classification: F28D,F28F

Abstract:
1. A heat exchanger including a body and at least one first substantially spiral or helical flow path having a first thread direction and provided on an external surface thereof, the body positioned within a housing to define a chamber between said external surface and an internal wall of said housing, a tube assembly helically or spirally positioned with the first thread direction about said external surface, said tube assembly having at least one second substantially helical or spiral flow path with the first thread direction and provided on its external surface and wherein the at least second substantially helical or spiral flow path extends from closely adjacent the external surface of the body to closely adjacent the internal wall of the housing, the relationship between the said at least first and said at least second helical or spiral flow paths being such that a first fluid flowing through said chamber is caused to flow along multiple turbulent flow paths, in heat transfer relationship with a second fluid flowing through said tube assembly.