Automatic Variable-Pitch Fan - A propeller-type fan whose hub incorporates a mechanism that enables the fan blades to be re-pitched simultaneously and automatically.Atmospheric - Refers to the movement of air through a cooling tower purely by natural means, or by the aspirating effect of water flow.Approach - Difference between the cold water temperature and the entering wet-bulb temperature.Generally measured upwind of a tower in a number of locations sufficient to account for all extraneous sources of heat. Ambient Wet-Bulb Temperature - The wet-bulb temperature of the air encompassing a cooling tower, not including any temperature contribution by the tower itself.Air Velocity - Velocity of air-vapor mixture through a specific region of the tower (i.e.Measured vertically on counterflow towers and horizontally on crossflow towers. Air Travel - Distance which air travels in its passage through the fill.Air Rate - Mass flow of dry air per square foot of cross-sectional area in the tower's heat transfer region per hour.Sometimes referred to as the louvered face on induced-draft towers. Air lnlet - Opening in a cooling tower through which air enters.Air Horsepower - The power output developed by a fan in moving a given air rate against a given resistance.A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A
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