Question

How does the flow of air occur in natural draught cooling towers?

(a) Natural pressure head density between cold outside air and humid inside air

(b) Variation in pressure of both cold outside air and humid inside air

(c) Due to the given air vents and vacuum ports

(d) Because of difference in the volume of both the of airs

I got this question in an online interview.

The query is from Cooling Ponds and Towers in portion Steam Generators & Accessories of Energy Engineering

Answer 1

The correct choice is (a) Natural pressure head density between cold outside air and humid inside air

The best I can explain: In natural draught cooling tower, the flow of air occurs due to the natural pressure head caused by density difference between the cold outside air and hot humid air inside. The disadvantage of natural draught cooling system is that, to produce to produce large draught the tower should be very high.