Chiller Sizing Formula
Tons = (GPM x Delta-T x 500) / 12,000
Tons = GPM x Delta-T / 24
For glycol: multiply by specific heat and specific gravity corrections
- Standard chilled water: 44°F supply, 54°F return (10°F delta-T)
- Flow rate: Typically 2.4 GPM per ton for 10°F delta-T
- Glycol correction: Reduces heat transfer capacity by 5-15%
- The 500 factor = 8.33 lb/gal x 60 min/hr x 1.0 specific heat