Antifreeze Corrections - York T2GY Installer's Manual

Antifreeze Corrections

Catalog performance can be corrected for antifreeze use. Please use the following table and note the example given.
Antifreeze Type
EWT - °F [°C]
Water
Ethylene Glycol
Propylene Glycol
Ethanol
Methanol
WARNING: Gray area represents antifreeze concentrations greater than 35% by weight and should
be avoided due to the extreme performance penalty they represent.
Antifreeze Correction Example
Antifreeze solution is Propylene Glycol 20% by weight. Determine the corrected heating and cooling performance at 30°F
and 90°F respectively as well as pressure drop at 30°F for a 038 model.
The corrected cooling capacity at 90°F would be: 36,800 MBtu/h x 0.969 = 35,659 MBtu/h
The corrected heating capacity at 30°F would be: 26,600 MBtu/h x 0.913 = 24,286 MBtu/h
The corrected pressure drop at 30°F and 9 gpm would be: 7.9 feet of head x 1.270 = 10.03 feet of head
Antifreeze % by wt
0
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
10
20
30
40
50
Heating
30 [-1.1] 90 [32.2]
1.000
0.973
0.943
0.917
0.890
0.865
0.958
0.913
0.854
0.813
0.770
0.927
0.887
0.856
0.815
0.779
0.957
0.924
0.895
0.863
0.833
35
T2GY INSTALLER'S GUIDE
Cooling Pressure Drop
30 [-1.1]
1.000
0.991
0.979
0.965
0.955
0.943
0.981
0.969
0.950
0.937
0.922
0.991
0.972
0.947
0.930
0.911
0.986
0.970
0.951
0.936
0.920
1.000
1.075
1.163
1.225
1.324
1.419
1.130
1.270
1.433
1.614
1.816
1.242
1.343
1.383
1.523
1.639
1.127
1.197
1.235
1.323
1.399