Ethylene Glycol Correction Factors - Wx Models - AIREDALE EasiCool Technical Manual

Precision Air Conditioning

Ethylene Glycol Correction Factors - WX Models

For conditions outside those quoted, please refer to Airedale.
The Use of Glycol
Glycol is recommended when a supply water temperature of +5°C or below is required or when static water can be
exposed to freezing temperatures.
The presence of glycol in the system has a direct effect upon the Cooling Duty, the Design Flow Rate and the unit
Pressure Drop.
To approximate the effect of glycol on unit performance, the following correction factors when applied can be used as a
guide.
Where:
Corrected Flow Rate
=
V 
THR = Equivalent Total Heat of Rejection (THR) (kW), refer to
as glycol concentration is increased is negligible.)
∆T = Temperature difference between Water/Glycol Inlet/Outlet (°C).
∆P = Maximum Water/ Glycol Pressure Drop for the indoor unit (kPa).
∆P w = Equivalent Water Pressure Drop for indoor unit (kPa), use the corrected flow rate
Pressure Drop (kPa) - WX Models
Corrected Flow Rate
V 
∆P Corrected Pressure Drop
Example:
1.76 l/s
=
V 
157Pa
∆P =
.
= THR / ∆T Flow Rate
= ∆Pw Pressure Drop
V26WX2-EZ Condensing Entering / Leaving at 30°C/35°C, Based on ΔT of 5°C,
24°C/45% RH Ambient, 20% Ethylene Glycol
THR (35.2) / ∆T
7.04
(12 - 7 = 5∆T) =
∆Pw 145 kPa
Cooling Duties - WX Models
Ethylene Glycol (Volume) / Freezing Point °C
10% / -4°C 20% / -9°C
0.240 0.250
x by
1.041 1.083
Ethylene Glycol (Volume) / Freezing Point °C
10% / -4°C 20% / -9°C
0.240 0.250
x by
1.041 1.083
EasiCool Technical Manual 7525389 V1.8.0_05_2016
EasiCool™
, (the change in THR values
. Refer to
V  Waterside
30% / -15°C 40% / -23°C
0.250 0.260
1.133 1.200
30% / -15°C 40% / -23°C
0.250 0.260
1.133 1.200
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