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13 - GLYCOL/WATER-MIX ANTIFREEZE PROTECTION
The table and the curves below indicate the minimum percentages of glycol with which the system must be provided depending on
the freezing point.
WARNING : The glycol concentration must protect the fluid at least 6°C below the water outlet temperature specified for the evaporator
to allow correct setting of the minimum pressure controller at the evaporator.
Glycol concentration required
Volume concentration in %
Freezing point °C
Ethylene glycol
Minimum water outlet °C
Freezing point °C
Propylene glycol
Minimum water outlet °C
Important: The values are given for guidance only, according to the standard characteristics of the MEG. These may vary depending
on the MEG manufacturer, therefore it is important to refer to the manufacturer's data to ensure protection is provided to the required
temperature.
For a glycol concentration greater than 40%, a special pump must be used.
Graph of minimum freezing and operating temperatures
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
0
10
Minimum operating temperature
B Monopropylene glycol
C Monoethylene glycol
0
10
0
-4
5
+3
0
-4
5
+4
20
Volume concentration in %
Freezing temperature
D Monopropylene glycol
E Monoethylene glycol
20
30
-10
-18
-1
-7
-9
-16
+1
-4
B
C
E
D
30
40
40
-27
-14
-25
-9
11
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