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Selection Data (Cont'd)
QUANTECH
5. Ethylene Glycol Correction Factors – The following factors are to be applied to
the standard ratings for units cooling ethylene glycol.
%WEIGHT
TONS
10
0.993
20
0.980
30
0.964
40
0.945
50
0.922
6. Propylene Glycol Correction Factors – The following factors are to be applied to
the standard ratings for units cooling propylene glycol.
%WEIGHT
TONS
10
0.985
20
0.968
30
0.937
40
0.898
50
0.862
METHOD OF SELECTION
If the duty requires a 10ºF range on both the evaporator and condenser, see "Ratings".
For water ranges other than 10ºF, use the following procedure.
1. Determine capacity required from the following formula.
Capacity (Tons) =
2. After applying any fouling factor corrections, the actual condenser heat rejection
may be determined as follows:
Heat Rejection (MBH) =
3. Determine condensing water requirements for water cooled models as follows:
Condenser Tons =
ETHYLENE GLYCOL
COMPR KW
GPM
1.002
1.029
1.004
1.040
1.007
1.055
1.009
1.071
1.013
1.091
PROPYLENE GLYCOL
COMPR KW
GPM
1.002
1.003
1.005
1.000
1.008
0.992
1.012
0.982
1.019
0.985
GPM x Chilled Water Range
24
Heat Rejection (Btuh)
1000
= (Tons x 12) = (kW x 3.415)
Heat Rejection (MBH) x 1000
15,000
FORM QWC3-EG1 (217)
PRESS
FREEZE
DROP
POINT
1.095
26
1.191
18
1.302
7
1.435
-8
1.599
-29
PRESS
FREEZE
POINT
DROP
1.078
28
1.157
19
1.288
9
1.414
<I
1.605
-28
(ºF)
19
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