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Antifreeze Corrections
SD2500AG 05/21
21
Page _____ of _____
Aston Series
1 - 6 Tons 60Hz
Catalog performance can be corrected for antifreeze use. Please use the following table and note the example given.
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 Aston Series Single Speed Model 022-ECM.
The corrected cooling capacity at 90°F would be: 22,400 MBtu/h x 0.969 = 21,706 MBtu/h
The corrected heating capacity at 30°F would be: 14,500 MBtu/h x 0.913 = 13,239 MBtu/h
The corrected pressure drop at 30°F and 6 gpm would be: 6.6 feet of head x 1.270 = 8.38 feet of head
WARNING: Gray area represents antifreeze concentrations greater than 35% by weight and should be
avoided due to the extreme performance penalty they represent.
Antifreeze Type
Antifreeze % by wt
Heating
Cooling
Pressure Drop
EWT - °F [°C]
30 [-1.1]
90 [32.2]
30 [-1.1]
Water
0
1.000
1.000
1.000
Ethylene Glycol
10
0.973
0.991
1.075
20
0.943
0.979
1.163
30
0.917
0.965
1.225
40
0.890
0.955
1.324
50
0.865
0.943
1.419
Propylene Glycol
10
0.958
0.981
1.130
20
0.913
0.969
1.270
30
0.854
0.950
1.433
40
0.813
0.937
1.614
50
0.770
0.922
1.816
Ethanol
10
0.927
0.991
1.242
20
0.887
0.972
1.343
30
0.856
0.947
1.383
40
0.815
0.930
1.523
50
0.779
0.911
1.639
Methanol
10
0.957
0.986
1.127
20
0.924
0.970
1.197
30
0.895
0.951
1.235
40
0.863
0.936
1.323
50
0.833
0.920
1.399
