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Consider the following statements for cooling towers: 1. Cooling tower is an artificial device used to cool the hot cooling water coming out of condenser more effectively. 2. The amount of water usually lost with induced draft cooling tower ranges from 5% to 6% by evaporation. 3. The amount of water usually lost with induced draft cooling tower ranges from 7% to 8% by drift losses. 4. The rate of evaporation of water and its cooling effect on the remaining water depends upon the relative humidity of air passing through the tower. Which of the above statements are correct?

Consider the following statements for cooling towers: 1. Cooling tower is an artificial device used to cool the hot cooling water coming out of condenser more effectively. 2. The amount of water usually lost with induced draft cooling tower ranges from 5% to 6% by evaporation. 3. The amount of water usually lost with induced draft cooling tower ranges from 7% to 8% by drift losses. 4. The rate of evaporation of water and its cooling effect on the remaining water depends upon the relative humidity of air passing through the tower. Which of the above statements are correct? Correct Answer 1 and 4 only

Explanation:

Cooling tower: 

It is a special type of heat exchanger in which the warm water and the air are brought in direct contact for evaporative cooling.

  • It is used to remove the heat of discharged water from the condenser so that the water can be recirculated and reused.
  • Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature.
  • The heat removed by the cooling tower is the difference between the temperature of the water leaving the cooling tower and the ambient wet-bulb temperature of the air.
  • The amount of water usually lost with induced draft cooling towers ranges from 1 to 2% by evaporation and 0.5 to 2% by drift losses.
  • The factors that affect evaporation is relative humidity of air, wind speed, temperature and surface area.

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