Glycol Correction Factor Calculator

🥶 Glycol System Inputs

Glycol Type

Glycol Concentration (%)

System Operating Temp (°F) CHW typically 44°F; brine or ice storage lower

Water-based GPM (baseline) GPM sized for pure water

📊 Glycol Correction Results

—
Corrected GPM (glycol)

—

Flow Correction Factor (Cf)

—

Freeze Point (°F)

—

Head Loss Multiplier

Fluid Properties at Operating Temp

Specific Gravity—

Specific Heat (BTU/lb·°F)—

Viscosity (cSt)—

Heat Capacity Factor (GPM×500×Cf)—

How to use: Multiply your water-based GPM by Cf to get glycol GPM. Apply the head loss multiplier to your pump head. Re-select pipe size using glycol GPM and the increased head loss.

📚 Glycol Selection Guide

Application	Glycol Type	Typical Concentration	Why
CHW plant, no freeze concern	EG or PG	20–25%	Minimum needed; lower viscosity penalty
CHW + outdoor piping	EG	30–35%	Protection to ~0°F design temp
Ice storage / low temp	EG	30–40%	25°F leaving temperature
Food/bev, indirect contact	PG	30–40%	GRAS (food safe)
Extreme cold climate	EG	40–50%	Protection to −30°F
Never exceed	—	50%	Higher conc. hurts heat transfer significantly

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