Energy consumption analysis of cooling tower fan operation
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"The purpose of this thesis is to present a method to quantitatively evaluate the annual energy consumption of several types of fan control that may be used on cooling towers. The types of fan control considered are: the cycling of single speed motors, the cycling of two speed motors, the use of variable speed drives (more specifically, variable frequency drives), and the use of automatic variable pitch fans. The energy consumption of these four means of fan control are determined through the use of a computer program. The program calculates the percentage of design air flow required for each wet bulb and heat load combination of a given weather profile for the geographic location of the tower. The theoretically required fan energy is related to the air flow through the fan law relationships. This quantity is then adjusted for any efficiency changes in the fan and drive system to arrive at the actual fan energy requirement. The energy requirement at each weather point is multiplied by its number of hours of occurrence and, added to the values from the other weather points to determine the total annual energy consumption for a given fan mode of operation. The four modes of fan operation are then economically evaluated on a comparative basis."--Introduction.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.