Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 39)

39 Chiller Technical Manual 7525355 V1.1.0_03_2013
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Chillers TurboChill™ Air Cooled and FreeCool
Performance Effects of Glycol
Glycol Data
For a given percentage of glycol in the system there are correction factors that need to be applied, the following tables
can be used as a guide.
CAUTION
The source data must be 100% water for the correction factors to be valid.
Ethylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point °C 10% / -4°C 20% / -9°C 30% / -15°C 40% / -23°C
Output (kW)
x
0.98 0.97 0.95 0.93
Compressor Input (kW) 0.99 0.98 0.96 0.95
Water Flow (l/s) 0.99 1.02 1.04 1.07
Pressure Drop (kPa) 1.05 1.20 1.38 1.57
Propylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point °C 10% / -2°C 20% / -6°C 30% / -12°C 40% / -20°C
Output (kW)
x
0.97 0.95 0.91 0.88
Compressor Input (kW) 0.99 0.98 0.96 0.95
Water Flow (l/s) 0.98 0.97 0.95 0.95
Pressure Drop (kPa) 1.08 1.17 1.31 1.45
Example: At 100% Water:
Output =750 kW
Compressor Input =228.6 kW
Flow Rate =35.83 l/s
Pressure Drop =20.6 kPa
Ambient =35°C
Inlet Fluid Temp. =7°C
Outlet Fluid Temp. =12°C (5K ∆T)
To 20% Ethylene Glycol:
100% Water Multiplier 20% Ethylene Glycol
Output (kW) 750 x 0.97 727.5 kW
Compressor Input (kW) 228.6 x 0.98 224.0 kW
Water Flow (l/s) 35.83 x 1.02 36.55 l/s
Pressure Drop (kPa) 20.6 x 1.20 24.72 kPa