OPTI TEMP OTC-3.0A - Glycol Tables

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12.13 Glycol Tables
Table 1
Increased Flow Requirements for 50% Glycol as Compared with Water
Fluid Temp (°F) Flow Increase Need for 50% Glycol as Compared with Water
40 1.22
100 1.16
140 1.15
180 1.14
220 1.14
Example: A water cooled condenser requires 11 GPM of 100°F water for condensing. If 50% glycol / water
mixture is used the flow rate will increase by a factor of 1.16. (11 GPM x 1.16 = 12.76 GPM)
Table 2
Effect of Glycol on Pump Head
Fluid Temp (°F) Pressure Drop Correction Flow Rates Combined Pressure Drop
Correction; 50% Glycol Flow
Increased
40 1.45 2.14
100 1.1 1.49
140 1.0 1.32
180 0.94 1.23
220 0.90 1.18
Example: A condenser requires 30 PSI of 100°F water for condensing. If 50% glycol / water mixture is used
the pressure required will increase by a factor of 1.49. (30 PSI x 1.49 = 44.7 PSI)
Table 3
Effect of Glycol on Freezing Point and Specific Gravity
% Ethylene
Glycol
by Volume
5 10 15 20 25 30 35 40 45 50
Freezing
Point
°F
30.02 28.04 24.98 19.94 15.98 8.96 3.02 -5.08 -16.06 -27.94
Freezing
Point
°C
-1.1 -2.2 -3.9 -6.7 -8.9 -12.8 -16.1 -20.6 -26.7 -33.3
Specific
Gravity
d
15.6°
1.004 1.006 1.012 1.017 1.020 1.024 1.028 1.032 1.037 1.040
Table obtained from Lange's Handbook of Chemistry, 10th ed. Specific gravity is referenced to water at 15.6°C.