York YCWL Series - Method of Selection

FORM 150.26-EG1 (116)
JOHNSON CONTROLS
19
5. ETHYLENE GLYCOL CORRECTION FACTORS – The following factors are to be
applied to the standard ratings for units cooling ethylene glycol.
ETHYLENE GLYCOL
%WEIGHT TONS COMPR KW GPM
PRESS
DROP
FREEZE
POINT
10 0.993 1.002 1.029 1.095 26
20 0.980 1.004 1.040 1.191 18
30 0.964 1.007 1.055 1.302 7
40 0.945 1.009 1.071 1.435 -8
50 0.922 1.013 1.091 1.599 -29
6. PROPYLENE GLYCOL CORRECTION FACTORS – The following factors are to be
applied to the standard ratings for units cooling propylene glycol.
PROPYLENE GLYCOL
%WEIGHT TONS COMPR KW GPM
PRESS
DROP
FREEZE
POINT
10 0.985 1.002 1.003 1.078 28
20 0.968 1.005 1.000 1.157 19
30 0.937 1.008 0.992 1.288 9
40 0.898 1.012 0.982 1.414 <I
50 0.862 1.019 0.985 1.605 -28
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) =
GPM x Chilled Water Range (ºF)
24
2. After applying any fouling factor corrections, the actual condenser heat rejection
may be determined as follows:
Heat Rejection (MBH) =
Heat Rejection (Btuh)
1000
= (Tons x 12) = (kW x 3.415)
3. Determine condensing water requirements for water cooled models as follows:
Selection Data (Cont'd)
Condenser Tons =
Heat Rejection (MBH) x 1000
15,000