Evaporator Tonnage Calculator

Flow & Load

Evaporator Tons Calculator

Estimate evaporator load from chilled-water flow and temperature difference.

Use flow and water temperatures from the same operating condition. Design tonnage is optional.

Chilled water flow

GPM

Entering CHW temperature

°F

Leaving CHW temperature

°F

Design tonnage (optional)

TONS

Estimated Load

— tons

Chilled-water ΔT—

Method and assumptions

Evaporator tons = GPM × ΔT ÷ 24. ΔT = entering chilled-water temperature − leaving chilled-water temperature.

This calculator assumes water. Glycol changes the heat-transfer factor and should be corrected for actual fluid concentration.

This is a calculated field load estimate, not a certified performance test. Use verified flow and temperature readings when accuracy matters.