If a cooling tower evaporates 65 gallons per minute and cycles the makeup water 3.5 times, how much blowdown is required daily?

To determine the daily blowdown required by a cooling tower that evaporates 65 gallons per minute and cycles the makeup water 3.5 times, we first need to calculate the total amount of water that is evaporated daily.

Since there are 1,440 minutes in a day (24 hours), the daily evaporation amount from the cooling tower can be calculated as follows:

Daily evaporation = 65 gallons/minute × 1,440 minutes/day = 93,600 gallons/day.

Next, to find the makeup water required for the cooling tower, we multiply the daily evaporation amount by the number of cycles:

Makeup water = Daily evaporation / Number of cycles = 93,600 gallons/day / 3.5 cycles = 26,771.43 gallons/day.

Now, the total water in the cooling tower system can be calculated by acknowledging that the blowdown, which is the water that must be discharged to maintain concentration and quality, is a portion of the total water used.

The formula for daily blowdown can be derived from the equation:

Blowdown = Makeup water - (Daily evaporation / Number of cycles).

Calculating the blowdown:

Daily blowdown = Makeup water - (93,600 gallons/day / 3.