Data Center Cooling Tower Makeup Water Calculator

Range: 0.1–10,000,000 gpm

Enter condenser-water recirculation flow in US gallons per minute. This is circulating flow, not makeup-water flow.

Range: 0.1–100 °F

Enter return/condenser-water temperature minus supply temperature in °F. The 0.00085 factor is an approximation tied to this range input.

Range: 1.01–100

Enter cycles of concentration as a ratio above one. Higher cycles reduce blowdown in this simplified mass balance.

Range: 0–0.01 decimal

Enter drift as a decimal fraction of recirculation flow (0.0002 = 0.02%). Use the tower/vendor value when known.

Range: 0–8,784 h

Enter annual operating hours, up to 8,784 hours for a leap year. Zero hours is allowed for a shutdown scenario.