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There are two main configurations of factory assembled cooling towers: crossflow and counterflow. In crossflow cooling towers, the water flows vertically down the fill as air flows horizontally across. In counterflow cooling towers, the water flows vertically down the fill as air flows vertically up.
Direct and Indirect Cooling Systems. Any surface of heat transfer in which volatile liquid expands and evaporates to produce a cooling effect is called direct expansion evaporator. Liquid absorbing die thermal energy is called direct expansion of the refrigerant.