Antifreeze Correction - York YAWS018 - 075 Installation Manual

AFFINITY SINGLE STAGE HYDRONIC INSTALLATION MANUAL

Antifreeze Correction

Catalog performance can be corrected for antifreeze use. Please use the following table and note the example given.
Antifreeze %
Antifreeze Type
by wt
EWT - °F [°C]
Water 0
10
20
Ethylene Glycol 30
40
50
10
20
Propylene Glycol 30
40
50
10
20
Ethanol 30
40
50
10
20
Methanol 30
40
50
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 for the source and methanol 10% for the load. Determine the
corrected heating at 30°F source and 80°F load as well as pressure drop at 30°F for an 050. Also, determine the corrected
cooling at 90°F source and 50°F load.
The corrected heating capacity at 30°F/80°F would be:
46,700 MBTUH x 0.913 x 0.985 = 41,998 MBTUH
The corrected cooling capacity at 90°F/50°F would be:
44,200 x 0.969 x 0.962 = 41,202 MBTUH
The corrected pressure drop at 30°F and 15 GPM would be:
5.2 psi x 1.270 = 6.60 psi
Heating
Load Source
80 [26.7] 30 [-1.1] 50 [10.0]
1.000 1.000
0.990 0.973
0.978 0.943
0.964 0.917
0.953 0.890
0.942 0.865
0.981 0.958
0.967 0.913
0.946 0.854
0.932 0.813
0.915 0.770
0.986 0.927
0.967 0.887
0.944 0.856
0.926 0.815
0.907 0.779
0.985 0.957
0.969 0.924
0.950 0.895
0.935 0.863
0.919 0.833
Cooling
Pressure
Drop
Load Source
90 [32.2] 30 [-1.1]
1.000 1.000 1.000
0.976 0.991 1.075
0.947 0.979 1.163
0.921 0.965 1.225
0.897 0.955 1.324
0.872 0.943 1.419
0.959 0.981 1.130
0.921 0.969 1.270
0.869 0.950 1.433
0.834 0.937 1.614
0.796 0.922 1.816
0.945 0.991 1.242
0.906 0.972 1.343
0.869 0.947 1.383
0.830 0.930 1.523
0.795 0.911 1.639
0.962 0.986 1.127
0.929 0.970 1.197
0.897 0.951 1.235
0.866 0.936 1.323
0.836 0.920 1.399
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