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20
% Flow 70 80 90 100 110 120 130
5 3 1.5 0 -1 -2 -2.5
Correction in °C on real
temperature of coil
intake temperature
Correcting factors
Foul factors
Altitude factors
Correcting factors for real temperature of coil air intake at
flows other than nominal
Factors with water and glycol
Glycol can be used for antifreeze protection, or as brine for
operation at low temperatures. We recommend the use of
water and glycol when the discharge water temperature is
below +6° C. The “Solution with glycol/freezing point” table
gives the freezing point of water with glycol, and the “Recom-
mended glycol concentration” table shows the glycol concen-
tration needed, depending upon application.
Glycol contains anticorrosive and antifoam components that
favour circuit protection.
Solution with glycol/freezing point
A mixture of glycol and water has a freezing point below that
of pure water. Depending upon the concentration of glycol in
the solution, an even lower freezing point can be achieved
and this protects the circuit when the unit is off and ambient
temperature is low (below 0° C). This table indicates freezing
point in accordance with glycol concentration. This concen-
tration appears in % per weight.
Recommended glycol concentration
The glycol concentration in the water should be checked regu-
larly to ensure adequate protection of the chiller.
Correcting factors
Water flow correcting factors for ethylene glycol solu-
tions
Evaporator
Foul factor m
2
°C/kW
Capacity factor
Absorbed power
factor comp.
0.044 1.000 1.000
0.088 0.987 0.995
0.176 0.964 0.985
0.352 0.926 0.962
Altitude (m) Capacity factor
Absorbed power
factor comp.
0 1.000 1.000
600 0.987 1.010
1 200 0.973 1.020
1 800 0.958 1.029
2 400 0.943 1.038
LWT °C Glycol % per weight
6°C > LWT > 0°C 20
0°C > LWT > -5°C 30
Correcting factors
Water flow Pressure drop
20 1.035 1.16
30 1.075 1.27
Ethylene glycol
percentage by weight
(%)
00
10 -4
20 -10
30 -17
35 -20
40 -25
50 -37
% Glycol weight per weight Freezing point °C
Ethylene
glycol
percentage
by weight
(%)
LWT
25 35 45
5 1.045 0.902 0.754
4 1.004 0.866 0.726
3 0.962 0.83 0.697
2 0.921 0.794 0.669
1 0.879 0.758 0.64
0 0.838 0.722 0.612
-1 0.795 0.681 0.574
-2 0.764 0.652 0.545
-3 0.734 0.623 0.515
-4 0.703 0.594 0.486
-5 0.673 0.565 0.457
20
30
Nominal capacity
correcting factors
Air temperature at
condenser intake (°C DB)