Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 32)

OPTICHILL
™
Chillers
32
Chillers
Technical Manual : 6530166 V1.6.0 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 100% Water for the correction factors to be valid.
Ethylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point ºC 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 ºC 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 Model Ref. = OPC800HE+D14
Ambient: = 35°C
Fluid = 20% Ethylene Glycol
Inlet Fluid Temp. = 7°C
Outlet Fluid Temp. = 12°C (5°C

T)
100% Water Multiplier Corrected Figure
Output (kW)
=
841.2 x 0.97 = 816.0 kW
Compressor Input (kW) Input (kW) - TFP {283.1 - {14 x 1.7}} = 259.3 x 0.98 = 254.1 kW
Water Flow (l/s)
Output
40.2 x 1.02 = 40.8 l/s
4.19 x ΔT
Pressure Drop (kPa)
Plot from curve (refer to Waterside
pressure drop (kPa) , on page 33)
33.1 x 1.20 = 39.7 kPa
Where:
Output
= (kW) Output (kW), refer to Performance Data , on page 28
Compressor Input = (kW) Input (kW) refer to Performance Data , on page 28, (-) Minus TFP
TFP
(Total Fan Power)
= (kW) Quantity of Fans to unit x Fan Motor Size, refer to General
Specification , on page 40
Water Flow = (l/s) ALWAYS USE 100% water SHC of 4.19.
ΔT = (°C) Difference of Entering Water and Leaving Water temperature