From Glocon, Inc. (Swifter Fans)
Due to spiraling energy costs in recent years, the market demand for large higher efficiency axial fan blades used in industrial cooling systems such as cooling towers, chillers, condensers and air cooled heat exchangers has grown. The key to improved energy efficiency is the cross-sectional shape, or airfoil, that governs the airflow around the fan blade. In an effort to achieve better energy efficiency, the National Renewable Energy Laboratory (NREL) has developed new and unique blade root and tip airfoils that transition linearly from root to tip and have progressively changing compatible performance characteristics. These new airfoils replace the less efficient airfoils still used in many industries today but were originally designed for aircraft many years ago.
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