Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 53)

Chillers OptiChill Freecool
Chillers
53
Technical Manual : 7197700 v1.2.0 02_2013
Performance Data
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 at 20% Glycol for the correction factors to be valid.
This data is for a guide only. Please contact Airedale for accurate figures.
Where:
Output
= (kW) Output (kW)
Compressor Input = (kW) Input (kW), (-) Minus TFP
TFP
(Total Fan Power)
= (kW) Quantity of Fans to unit x Fan Motor Size.
Water Flow = (l/s) ALWAYS USE 20% Glycol Specific heat Capacity of 3.9.
ΔT = (°C) Difference of Entering Water and Leaving Water temperature
Ethylene Glycol Nominal Correction Factors
Glycol in System / Freezing
Point ºC
20% / -9°C 30% / -15°C 40% / -23°C
Cooling Duty
x by
1.00 0.98 0.96
Input Power 1.00 0.98 0.97
Water Flow 1.00 1.02 1.05
Pressure Drop 1.00 1.15 1.31
Propylene Glycol Nominal Correction Factors
Glycol in System / Freezing
Point ºC
20% / -6°C 30% / -12°C 40% / -20°C
Cooling Duty
x by
1.00 0.96 0.93
Input Power 1.00 0.98 0.97
Water Flow 1.00 0.98 0.98
Pressure Drop 1.00 1.13 1.25
Example OFC076R16-66HS1 operating at 10/15, 35°C Ambient, 30% Ethylene Glycol
Cooling kW (752.2) x 0.98
30% Ethylene
Glycol =
737.2 kW
Input kW (264.7) x 0.98 259.4 kW
Flow l/s (38.6) (calculated:
3.9 x T
(Output)

)
x 1.02 39.37 l/s
Pressure Drop kPa (107.8) x 1.15 124 kPa