Fin for a reversible heat exchanger

Claim 1

Fin construction for a reversible heat exchanger adapted to be positioned with opposite ends thereof in a flow of air, the heat exchanger having a plurality of generally parallel fluid conduits connected to conduct a fluid medium through the heat exchanger and a plurality of fins arranged in side-by-side relationship to dissipate heat from the fluid conduits by the flow of air, each of said fins comprising: a. a piece of sheet material defining a pair of generally parallel, opposed substantially identical edges disposed adjacent the opposite ends of the heat exchanger and extending generally transverse to the direction of air flow through the exchanger; b. a plurality of corrugations formed between said opposed edges and extending longitudinally with respect to said opposed edges; c. a plurality of apertures formed in said sheet material between said opposed edges to provide a row of apertures extending longitudinally of said corrugations and adapted to one each frictionally receive one of the fluid conduits; d. said piece Of material further defining longitudinally extended generally planar edge angle portions adjacent each of said opposed edges and disposed at acute angles greater than 0* and less than 45* relative to a plane extending tangent to an adjacent portion of a corrugation and other like portions of said corrugations; e. said edge angle portions cooperating with edge angle portions of adjacent fins to deflect the air entering and leaving the heat exchanger whereby to create air turbulence at said edge angle portions and provide a heat exchanger having a heat transfer rate and a pressure differential between opposite ends thereof of a substantially equal amount regardless of the direction of air flow through the heat exchanger without deflecting air leaving the heat exchanger an excessive amount.