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WSHP-PRC001-EN 69
Performance Data
Antifreeze Correction Factors
Table A1: Correction Factors for Antifreeze Solutions
Methanol
Item
Concentration by Volume
10% 20% 30% 40% 50%
Cool
Capacity
.9980 .9965 .9949 .9932 .9915
Heat
Capacity
.9950 .9898 .9846 .9794 .9742
Pressure
Drop
1.023 1.057 1.091 1.122 1.160
Ethylene Glycol
Cool
Capacity
.9955 .9912 .9870 .9830 .9790
Heat
Capacity
.9925 .9848 .9770 .9690 .9610
Pressure
Drop
1.024 1.068 1.124 1.188 1.263
Propylene Glycol
Cool
Capacity
.9934 .9869 .9804 .9739 .9681
Heat
Capacity
.9863 .9732 .9603 .9477 .9350
Pressure
Drop
1.040 1.098 1.174 1.273 1.405
Example 1 (Ethylene Glycol):
The antifreeze solution is 20% by volume of Ethylene Gly-
col. Determine the corrected cooling capacity and water-
side pressure drop for a GEHB 018 when the EWT is 86 F
and the GPM is 4.2.
From the catalog data, the cooling capacity at these condi-
tions with 100% water is 18.6 MBTUH, and the waterside
pressure drop is 6.0 feet of head. At 20% Ethylene Glycol,
the correction factor for cool capacity is 0.9912 and the
pressure drop is 1.068.
The corrected cooling capacity (MBTUH) = 18.6 * 0.9912 =
18.4. The corrected water side pressure drop (Ft. head) =
6.9 * 1.068 = 7.4.
Example 2 (Propylene Glycol):
The antifreeze solution is 30% by volume of Propylene
Glycol. Determine the corrected heating capacity and
waterside pressure drop for a GEHB 042 when the EWT is
45 F and the GPM is 9.7.
From the catalog data, the heating capacity at these condi-
tions with 100% water is 36.7 MBTUH, and the waterside
pressure drop is 16.1 feet of head. At 30% Propylene Glycol,
the correction factor for heat capacity is 0.9603 and the pres-
sure drop is 1.174.
The corrected cooling capacity (MBTUH) = 36.7 * 0.9603 =
35.2. The corrected water side pressure drop (Ft. head) =
16.1 * 1.174 = 18.9.