An investigation of the approximate evaporation ratet from wet mechanical draft cooling lowers has been made for various lite elevations above sea level up to 3048 m (10,000 ft). The heat balance method used here is a refinement of those previously reported and includes an extension of previous results to higher elevations. Plots are provided for estimating evaporation as a function of cooling-tower load, ambient relative humidity and wet-bulb temperature, and cooling-tower site elevation. Comparisons of predicted make-up water usage by this study, from a previous study, and that predicted by some cooling tower manufacturers, at several sites and elevations are also presented.
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