Patent ID: 8020612

Claim:
A stacked-plate heat exchanger comprising: at least one first flow duct for at least a first medium to flow through; and at least one second flow duct for at least a second medium to flow through in order to cool the first medium, wherein the at least one first flow duct and the at least one second flow duct are formed between adjacent plates, wherein at least one of the adjacent plates comprises a first opening for the first medium to flow through and at least two second openings for the second medium to flow through, the first opening being arranged at least in certain sections between the two second openings, wherein at least a portion of the first opening is at a smaller distance from a central section of the stacked-plate heat exchanger than at least one of the second openings, and wherein at least a portion of an edge of the first opening is substantially in a shape of a normal distribution function wherein at least one section of an edge of the first opening is in a shape of a polynomial y n =a n x 4 +b n x 3 −c n x 2 +d n x+e n with n corresponding to a number of sections that form the shape of the polynomial.