Angled turbulator for use in heat exchangers

In a heat exchanger including a heat exchange unit, said heat exchange unit including a first surface spaced generally parallel to a second surface to define a flow chamber, a flow inlet spaced from a flow outlet, and a generally planar, lanced and offset turbulator in the flow chamber, said turbulator including a sheet of a material, said sheet having a plurality of strand-like rows of alternating crests and valleys, the crests and valleys in each row being offset with respect to the crests and valleys in any immediately adjacent row, each of said rows having an interface with any immediately adjacent row, said interfaces being perforated so that valleys in each row are in fluid communication with immediately adjacent crests in any immediately adjacent row and crests in said each row are in fluid communication with any immediately adjacent valleys in said any immediately adjacent row;

• the improvement wherein:
• a first set of said valleys are arranged to define a first series of parallel channels at an acute angle to a line defined by the shortest distance between the flow inlet and the flow outlet, and
• a first set of said crests are arranged to define a first series of parallel ridges at said acute angle to said line defined by the shortest distance between the flow inlet and the flow outlet.