Design of natural-draught towers

The duty coefficient is given by the following equation (in which SI units must be used as it is not dimensionally consistent)  

What are die diameter of a hyperbolic natural-draught cooling tower handling 4810 kg/s of water 

Taking C, as 5.0 and assuming as a first estimate a tower height of 1(X) m. then in equation 13..51  

Thus the internal diameter of the column at sill level = I -----j 

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In the design of natural-draught towers, a ratio of height to base diameter of 3 2 is normally used and a design method has been proposed by CHILTON(,0 Chilton has shown that the duty coefficient D, of a tower is approximately constant over the normal range of operation and is related to tower size by an efficiency factor or performance coefficient C, given by ... 

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