Abstract: A heat exchanger coil assembly is provided. The fins of the assembly include lance style enhancements on a corrugated shape of the fin. Lances are provided on both the upstream and the downstream sides of each corrugation. The upstream lance forms a first angle with respect to a direction of mean airflow and the downstream lance forms a second angle with respect to the direction of mean airflow. The first and second angles are not equal, such that the lances are canted with respect to one another. This generates two different streams of air flow such that a wake of the upstream lance will not impinge on the downstream lance, thereby maximizing heat transfer for both the upstream and the downstream lances.

Abstract: A heat exchanger coil assembly is provided. The fins of the assembly include lance style enhancements on a corrugated shape of the fin. Lances are provided on both the upstream and the downstream sides of each corrugation. The upstream lance forms a first angle with respect to a direction of mean airflow and the downstream lance forms a second angle with respect to the direction of mean airflow. The first and second angles are not equal, such that the lances are canted with respect to one another. This generates two different streams of air flow such that a wake of the upstream lance will not impinge on the downstream lance, thereby maximizing heat transfer for both the upstream and the downstream lances.

Abstract: The invention relates to an improved fin and tube type heat exchanger wherein thin, heat-conducting fins act as a secondary heat-exchange surface for a heat-conducting medium flowing through the tubes. The thin fin plates substantially lie in a plane perpendicular to the air flow and have angled louvers formed therein. The angled louvers have a short leg and a long leg, with the short leg preferably in the fin plane with the long leg bent therefrom. The unequal length legs permit a larger condensate gap between the trailing edge of one louver and the leading edge of the next louver. With the combination of an angled louver plus the short leg lying in the fin plane, a substantially strong fin is provided even with a thin fin plate. The combination of the short leg lying in the direction of air flow, with the longer leg being inclined thereto, allows a high heat transfer coefficient at the leading edge, while the angled portion behind the leading edge generates a turbulent flow to reduce boundary layer growth.

Abstract: A heat exchanger is provided with a plurality of fins connected in thermal communication with a tube. The tube is shaped to conduct the flow of the first fluid and the fins are arranged to be disposed within a stream of flow of a second fluid. The fins are provided with a plurality of holes, or perforations, through which the second fluid is directed to flow. The holes through the fins are generally oblong in shape, being somewhat elliptical. The oblong hole has two generally semicircular ends and two connecting long sides, wherein one of the long sides is generally flat and the other long side is provided with a cusp surface which divides the oblong hole into two generally equal portions. The relative position of the cusp surface to the long surface creates counter rotating vortices in the flow of fluid as it passes through the hole. These counter rotating vortex pairs wipe the surface of an adjacent fin when the flow is directed to impinge against a non-perforated portion of that adjacent fin.