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2-40 HP Portable Chillers Chapter 3: Installation 26 of 70
Figure 6: Ethylene Glycol and Propylene Glycol Curves
Pe
r
cent Gly
c
ol Curves
f
or Freeze P
r
ote
c
tion
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
10.0
20.0
30.0
40.0
0.0 10.0 20.0 30.0 40.0 50.0 60.0
% Gl ycol by Volum e
Eth ylene G lycol
Propylene Glycol
Example: 45°F set point minus 20°F = 25°F.
From Figure 28, 25°F equates to 10% by volume of glycol required.