Chiller Capacity Calculator
Flow · Delta-T · Glycol Correction
Inputs
GPM
°F
°F
ΔT (EWT − LWT)
10.0 °F
%
Glycol Correction Factor (GCF)
1.000
LWT-dependent · interpolated from manufacturer tables
Capacity Results
Chiller Capacity
1,200,000
BTU/hr
Tonnage
100.0
tons (BTU ÷ 12,000)
GPM / Ton Check
2.40
GPM ÷ tons
Standard AHRI design range (2.4 GPM/ton)
OK
Q = 240 × 10.0 × 500 × 1.000
Q = 1,200,000 BTU/hr
Tons = Q ÷ 12,000 = 100.0
Reference
Freezing Point by Glycol Concentration
Use these tables to pick a glycol mix that protects below your lowest expected ambient or LWT.
Propylene Glycol
By weight| % by weight | 15% | 20% | 25% | 30% | 35% | 40% | 50% |
|---|---|---|---|---|---|---|---|
| Freezing point | 24°F | 18°F | 15°F | 9°F | 5°F | −5°F | −30°F |
Ethylene Glycol
By weight| % by weight | 10% | 15% | 20% | 25% | 30% | 35% | 40% |
|---|---|---|---|---|---|---|---|
| Freezing point | 25°F | 21°F | 17°F | 11°F | 5°F | 0°F | −10°F |
Note: percentages shown are by weight. Always confirm freeze protection against your lowest expected condition — equipment manufacturers typically recommend a ~10°F safety margin below the coldest operating temperature.