Delta wing and ramp wing enhanced plate fin

An enhanced plate fin of a plate fin heat exchanger for transferring heat between the fin and a fluid flowing over the fin comprising:

• a convoluted heat transfer means for enhancing the exchange of heat between the fluid and the fin, said convoluted heat transfer means having a sine-like wave pattern of predetermined height along the fin in a direction parallel the flow of the fluid over the fin, said sine-like wave pattern having curved peaks at a maximum and minimum of said wave heights of the pattern along the fin, said peaks extend along said convoluted heat transfer means generally transverse to the direction of flow of the fluid flowing over the fin;
• and
• an enhanced heat transfer section disposed generally parallel to said peaks, said enhanced heat transfer section having a number of rows of a plurality of raised delta wing means and ramp means, said rows of raised delta wing means and ramp means arranged in a direction generally perpendicular to the direction of flow of the fluid, a side length of each of said plurality of raised delta wing means and ramp means connected to the fin in a direction generally perpendicular to the direction of flow of the fluid, said side length of said ramp means positioned upstream in the flow direction of the fluid wherein said raised ramp means form counter rotating vortices in the fluid and said side length of said delta wing means positioned downstream in the flow direction of the fluid, said raised delta wing means and ramp means are triangular shaped, with a raised apex downstream in the fluid direction from said side length connected to the fin for said raised ramp means, and with a apex upstream in the fluid direction from said side length connected to the fin for said raised delta wing means.