Airedale LogiCool FreeCool 40kW - Manual (Page 23)

Chillers LOGICOOL
™
Chillers
23
Technical Manual : 6521355 V1.8.0 07/2014
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 All free-cooling units should use a MINIMUM 20% glycol concentration.
Ethylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point ºC 20% / -9°C 30% / -15°C 40% / -23°C
Output (kW)
x
1.00 0.98 0.96
Input (kW) 1.00 0.98 0.97
Water Flow (l/s) 1.00 1.09 1.12
Pressure Drop (kPa) 1.00 1.29 1.48
Propylene Glycol Nominal Correction Factors
Glycol in System / Freezing Point ºC 20% / -6°C 30% / -12°C 40% / -20°C
Output (kW)
x
0.98 0.94 0.91
Input (kW) 1.00 0.98 0.97
Water Flow (l/s) 1.00 0.99 0.99
Pressure Drop (kPa) 1.08 1.22 1.35
Example Model Ref. = LCC40
Ambient: = 35°C
Fluid = 30% Ethylene Glycol
Inlet Fluid Temp. = 7°C
Outlet Fluid Temp. = 12°C (5°C

T)
Catalogue Multiplier Corrected Figure
Output (kW)
=
33.7 x 0.98 = 33.0 kW
Compressor Input (kW) 14.4 x 0.98 = 14.1 kW
Water Flow (l/s)
Output
1.99 x 1.02 = 2.03 l/s
3.9 x ΔT
Pressure Drop (kPa)
Plot from curve (refer to Waterside
Pressure Drop (kPa) , on page 24)
128 x 1.15
=
147.2 kPa
Where:
Output = (kW)
Output kW, refer to Capacity Data - DX (Mechanical) Cooling , on page 20
Input = (kW) Input kW, refer to Capacity Data - DX (Mechanical) Cooling , on page 20
ΔT = (°C) Difference of Entering Water and Leaving Water temperature
All performance data is supplied in accordance with BS EN 14511-1:2013