Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 26)

OPTICHILL Chillers
26
Chillers
Installation & Maintenance : 6564868 02/2013
Installation 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 46)
33.1 x 1.20 = 39.7 kPa
Where:
Output
= (kW) Output (kW), refer to Technical Manual
Compressor Input = (kW) Input (kW) refer to Technical Manual (-) Minus TFP
TFP
(Total Fan Power)
= (kW) Quantity of Fans to unit x Fan Motor Size
Water Flow = (l/s) ALWAYS USE 100% water SHC of 4.19
ΔT = (°C) Difference of Entering Water and Leaving Water temperature
CAUTION Waste glycol needs to be handled responsibly, recycled or turned over to professional
personnel for correct disposal. Most anti-freeze manufacturers recommend that used anti-
freeze be collected and disposed according to Local Legislation. Waste glycol should NOT be
drained onto the ground, rainwater drainage system or natural waters.
If the glycol contains heavy metals or other contaminants from gas or oil, the level of hazard
posed by the glycol is increased and could be characterised as hazardous waste.
STEPS IF GLYCOL IS RELEASED/SPILLED
Small spill - soak up with absorbent material.
Large spill - contain spill and pump to suitable container for disposal.