Topic 12 - Cooling Tower

Question 1

What is the maintenance required for cooling tower?

Answer 1

1. Biocides are added to the water to kill harmful bacteria, prevent build-up of scale
2. Clean clogged spray nozzle
3. Ensure adequate air flow

Question 2

What happens if maintenance is not done?

Answer 2

1. Excessive scale build-up is an indication of inadequate water treatment
2. Clogged spray nozzle results in uneven water distribution
3. Inadequate airflow will result in insufficient heat transfer

Question 3

What causes scaling at cooling tower and what is the effect of it?

Answer 3

Dissolved solids in circulating water. Cooling water pipe lines in the machine become narrower, therefore reducing heat exchange efficiency and even resulting in clogging

Question 4

Explain how the induced cooling tower works

Answer 4

Water enters the tower and travels downwards. Air is induced into the base of the tower by a fan and travels upwards. Some of the water evaporates as it passes through the fill and this cools the remaining water that falls into the basin.