Unit 48 - Cooling Towers and Pumps

Technician "A" says that a cooling tower can reduce the temperature of the water supplied to the condensers to a temperature equal to, but not less than, the wet-bulb temperature of the ambient air. Technician "B" says that a cooling tower's approach temperature is the temperature of the water returning from the water cooled condensers. Which of the following statements is correct?

• Technician "A" is correct. Technician "B" is correct.

• Technician "A" is correct. Technician "B" is incorrect.

• Technician "A" is incorrect. Technician "B" is correct.

• Technician "A" is incorrect. Technician "B" is incorrect.

If the blower on a cooling tower breaks down on a hot day, the ____.

• approach temperature will increase

• water supplied to the condensers will be warmer

• efficiency of the tower will increase

• Both a and b.

The heat that the cooling tower must reject from the water in the chiller is the cooling load of the conditioned area plus the heat of ____.

• absorption

• compression

• vortexing

• cavitation

Cooling towers are designed to reduce the entering water temperature to within ____°F of the air's wet-bulb.

• 5°F

• 1°F

• 10°F

• 15°F

When sizing a cooling tower, the tower is sized to handle the cooling load of the conditioned area plus about (a)   % for heat of compression.

• 0

• 15

• 25

• 35

A new chemical-free water purification technology is used in cooling towers to (a)   .

• avoid vortexing

• balance the water flow

• eliminate scale

• All of the above.

The term (a)   refers to the process of cooling the circulating condenser water by evaporating the tower water.

• cyclic

• adiabatic

• isothermal

• polytropic

Natural draft towers and spray ponds are designed to produce a difference in water and air temperatures of ____°F.

• 3

• 5

• 7

• 10

Two methods used to aid the evaporation rate of water in a forced or induced draft tower are ____.

• vortexing and cavitation

• spray pond and prevailing wind

• float type valve and by-pass valve

• splash and wetted-surface (or fill)

A blowdown system for a cooling tower ____.

• reduces the concentration of sediment in the sump

• provides extra draft for higher evaporation rate

• promotes vortexing

• provides a means for balancing the water flow