Turning vanes and heat exchangers and methods of making the same

A heat exchanger assembly comprising:

• an inlet duct;
• a heat exchanger coupled to the inlet duct wherein the intake plane of the heat exchanger is at an angle between 0 degrees and 90 degrees to the primary flow direction of the inlet duct;
• and
• a plurality of turning vanes coupled to the heat exchanger and protruding into the inlet duct, each turning vane in the plurality of turning vanes comprising:
• a straight leading edge of length L that is parallel to the primary flow direction of the inlet duct;
• a convex lower surface that transitions a bottom of the leading edge to an upper wall of a lower channel situated below the convex lower surface of the turning vane;
• and
• a concave upper surface that transitions a distal tip of the turning vane to a lower wall of an upper channel situated above the concave upper surface of the turning vane and wherein the concave upper surface extends an entire distance between the distal tip and the lower wall of the upper channel wherein the distal tip is defined by an arc with radius r and wherein the distal tip is tangential to both the leading edge and the concave upper surface.

A heat exchanger assembly comprising:

• an inlet duct;
• a heat exchanger coupled to the inlet duct wherein the intake plane of the heat exchanger is at an angle between 0 degrees and 90 degrees to the primary flow direction of the inlet duct;
• and
• a plurality of turning vanes coupled to the heat exchanger and protruding into the inlet duct, each turning vane in the plurality of turning vanes comprising:
• a straight leading edge of length L that is parallel to the primary flow direction of the inlet duct;
• a convex lower surface that transitions a bottom of the leading edge to an upper wall of a lower channel situated below the convex lower surface of the turning vane;
• a concave upper surface that transitions a distal tip of the turning vane to a lower wall of an upper channel situated above the concave upper surface of the turning vane wherein the distal tip is defined by an arc with radius r and wherein the distal tip is tangential to both the leading edge and the concave upper surface;
• and wherein each turning vane in the plurality of turning vanes is coupled to a sidebar of the heat exchanger.