Patent ID: 8408282

Claim:
A heat exchange device comprising a body having at least one coolant flow passage formed therein, the coolant flow passage being a single enclosed passage formed within said body, the single enclosed passage having a plurality of linear channel segments in serial fluid flow communication such that each segment communicates directly with only one upstream segment and one downstream segment, each of said segments extending from an inlet to an outlet and having a segment channel axis therethrough, in use a coolant flow through each segment being directed along the segment channel axis, the channel axes of successive segments disposed substantially perpendicularly relative to one another and all of said channel axes being located in a common plane defined within said body, each segment having a length less than a length required for fully-developed laminar flow and thereby causing a pipe inlet effect in each segment, and wherein the body is a monolithic current-carrying winding of an electric machine and the coolant flow passage is formed in at least one peripheral surface of the body.