Patent ID: 8541721
Filing Date: 2013-09-24
Classification: B21D,F28F,H05B,Y10T

Abstract:
1. A solid heat transfer element for generating heat from an electric current passing through its electrically resistant material and transferring the heat to an air flow in communication with the solid heat transfer element, comprising: an elongate member composed of an electrically resistive, heat generating material, placed transversely to the air flow with an aerodynamic profile, symmetrical in respect to the air flow, the elongate member having a cylindrical surface including a surface area in contact with the air flow; and male protrusions extending from the cylindrical surface of the elongate member into the fluid flow, the male protrusions configured to provide additional surface area in contact with the air flow and to generate vortices to mix heated air layers to increase the rate of heat transfer from the elongate member to the air flow, and the male protrusions being of a shape selected from the group consisting of an a tear drop shape and an egg shape, the male protrusion shape generally tapering to a narrower dimension in the direction of air flow.