20-15: Thermal Performance Comparison between Fan Staging and Variable SpeedThe thermal performance of a cooling tower can be regulated by varying fan power. Typically, it is possible to lower fan power significantly, while only having a minimal impact on the thermal capacity of a cooling tower. Cooling towers are designed to achieve the specified cooling capacity at the highest ambient wet bulb temperatures for the area in which it will be operated. If a cooling tower is built to achieve the design operating conditions that