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Water Make-Up Requirements of Cooling Towers

Evaporative cooling towers, like the ADVANTAGE Power Tower® Series, provide cooling by evaporating a small amount of the recirculated process water flow.

  • Approximately 1,000 BTU’s are required to evaporate .12 gallons of water. Therefore, every tower ton (15,000 BTU/hr) requires approximately 1.8 gallons of water evaporation, or .03 gpm/ton.
  • As water evaporates in a cooling tower system, the water vapor enters the atmosphere while any dissolved solids remain behind, building concentration in the remaining water.
  • Most water treatment systems control this concentration by bleeding off the high concentration water, which is made up by fresh city water with a lower solid concentration. The amount of water that is bled off by the water treatment system is usually less than or equal to the amount of water that evaporates.
  • Therefore, the maximum normal water makeup for a cooling tower system is .06 gpm / ton, or about 2% of the nominal tower flow rate.
  • The following chart specifies the Maximun Water Make Up requirement per model.

Advantage Power Tower

Model shown: TC-135G3

The following chart specifies the Maximun Water Make Up requirement per model.

TC-45F @ 45 tons

Maximum Evaporation

1.35 GPM

at designed capacity

Nominal Tower Flow Rate

135 GPM

 

Maximum Water Make-Up

2.7 GPM

at designed capacity

TC-85F @ 85 tons

Maximum Evaporation

2.55 GPM

at designed capacity

Nominal Tower Flow Rate

255 GPM

 

Maximum Water Make-Up

5.1 GPM

at designed capacity

TC-105F @ 105 tons

Maximum Evaporation

3.15 GPM

at designed capacity

Nominal Tower Flow Rate

255 GPM

 

Maximum Water Make-Up

6.3 GPM

at designed capacity

TC-135F @ 135 tons

Maximum Evaporation

4.05 GPM

at designed capacity

Nominal Tower Flow Rate

405 GPM

 

Maximum Water Make-Up

8.1 GPM

at designed capacity

TC-170F @ 170 tons

Maximum Evaporation

5.10 GPM

at designed capacity

Nominal Tower Flow Rate

510 GPM

 

Maximum Water Make-Up

10.2 GPM

at designed capacity

TC-210F @ 210 tons

Maximum Evaporation

6.30 GPM

at designed capacity

Nominal Tower Flow Rate

630 GPM

 

Maximum Water Make-Up

12.6 GPM

at designed capacity

TC-270F @ 270 tons

Maximum Evaporation

8.10 GPM

at designed capacity

Nominal Tower Flow Rate

810 GPM

 

Maximum Water Make-Up

16.2 GPM

at designed capacity

TC-405F @ 405 tons

Maximum Evaporation

12.15 GPM

at designed capacity

Nominal Tower Flow Rate

1,215 GPM

 

Maximum Water Make-Up

24.5 GPM

at designed capacity

TC-540F @ 540 tons

Maximum Evaporation

16.20 GPM

at designed capacity

Nominal Tower Flow Rate

1,620 GPM

 

Maximum Water Make-Up

32.4 GPM

at designed capacity

For more information about water make-up requirements and cooling tower systems call the Advantage Sales Department at 317-887-0729.

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