Antifreeze Correction Factors - Trane GEH 006 Manual

Table A1: Correction Factors for AntifreezeSolutions
Methanol
Item
10%
Cool .9980
Capacity
Heat .9950
Capacity
Pressure 1.023
Drop
Ethylene Glycol
Cool .9955
Capacity
Heat .9925
Capacity
Pressure 1.024
Drop
Propylene Glycol
Cool .9934
Capacity
Heat .9863
Capacity
Pressure 1.040
Drop
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 GEHBA018 when the EWT is 86 F
and the GPM is 4.2.
From the catalog data, the cooling capapcity 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 GEHB042 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.
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Performance Data

Antifreeze Correction Factors

Concentration by Volume
20% 30% 40%
.9965 .9949 .9932
.9898 .9846 .9794
1.057 1.091 1.122
.9912 .9870 .9830
.9848 .9770 .9690
1.068 1.124 1.188
.9869 .9804 .9739
.9732 .9603 .9477
1.098 1.174 1.273
50%
.9915
.9742
1.160
.9790
.9610
1.263
.9681
.9350
1.405
WSHP-PRC001-EN