Important design parameters for the countercurrent cooling tower operation

Earlier we described the area bound by A-B-C-D and noted it to be proportional to the reciprocal of the value of the integral for Ntu. This value defines the characteristics of the tower, and it is clear that the lower the area, the higher the value KaV/L, i.e., high contact area (a) and high contact volume (V) therefore, high investment cost. The reduction of the investment cost and, therefore, the increase of area A-B-C-D, can be achieved by increasing 

Approach and cooling range are also indicated in the diagram. Note that the smaller the approach, the smaller the area A-B-C-D and, consequently, the higher the investment cost. 

The relationship between K and KG for absorption theory was given in Chapter 3 as 

The Cooling Tower Institute has also recommended the following equation for the performance of commercially used cooling tower packings. 

Note that Ga is the air mass-velocity in lb dry air/(hr) and 0 is a function of the type of packing and number of packing deck levels. This, in turn, fixes 

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Figure 5.12 Important design parameters for the countercurrent cooling tower operation.

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