Patent ID: 8322407

Claim:
A heat exchanger comprising: first and second fluid reservoirs that retain a quantity of fluid; at least one tube that circulates the fluid between the first and second reservoirs; a header plate, retained in at least one of the first and second reservoirs, through which the at least one tube is mounted; and a pressure reduction plate having at least one aperture that encompasses an end of the at least one tube, the aperture having sloped side walls that slope outwardly from the end, to reduce turbulence of the fluid between the at least one tube and the respective reservoir, wherein at least one of the sloped side walls is of substantially constant thickness and defines an outer surface exposed in one of the reservoirs and also defines an inner surface opposite the outer surface and having an inner radius of curvature such that a ratio of the radius of curvature to a diameter of the at least one tube is at least 0.15.