Evaporation is the major stage in cooling tower process. The
most common misconception associated with evaporation in cooling tower is that
competing tower manufacturers and designs can undertake differences in the amount
of water being evaporated in a cooling tower.
The actual reason is that large amount of heat exchange in a
cooling tower is done by the evaporation of a portion of the circulating water.
This removes heat from the remainder of the circulating water by removing the
latent heat of vaporization necessary to complete this phase change. In as much
as evaporating water is the basic function of the cooling tower, one is
compelled to believe that a cooling tower can operate successfully without the
proper evaporation.
There are a few
design which can effect on the evaporation rate. For example, cooling towers
with identical duties, but operating at different L/G ratios, will have
slightly different evaporation rates. The normal ʺrule of thumbʺ for
determination of evaporation is 0.1 % 1 degree F the circulating water
flow for every 1.0 °F range.
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