Operation of a Water-Cooling Tower

As in all packed-column operations, the fxmdamental model equations consist of differential balances taken over each phase the principal novelty here is tiie simultaneous use of mass and energy balances. 

This balance is no different from similar mass balances used in packed-gas absorbers and distillation columns (see Chapter 8) and takes the form 

Rate of water vapor in - Rate of water vapor out 

This balance is omitted since the water losses are usually less than 1%. 

Here we must be careful to include both sensible heat transfer as well as the latent heat brought into the air by the water vapor. We obtain 

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