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How is air produced in mechanical draught cooling tower?

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How is air produced in mechanical draught cooling tower?

(a) Air Tuyeres

(b) Propeller fans

(c) Air blowers

(d) Louvre

This question was posed to me during an interview.

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

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Best answer
The correct choice is (b) Propeller fans

Explanation: In mechanical draught cooling tower the draught of air id produced mechanically by means of propeller fans. This increases the cooling rate by increasing the air velocity over the wet surfaces and through the tower. These two towers give higher efficiency; reduce spray and windage losses and less ground area.

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