York YCAL Series, Руководство пользователя, Страница: 14 / 104

JOHNSON CONTROLS
FORM 150.67-EG1 (219)
14
Selection Data (Cont'd)
6.
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 0.996 0.999 24.300 1.014 26.2
20 0.991 0.998 25.100 1.104 17.9
30 0.984 0.997 25.900 1.234 6.7
40 0.976 0.995 26.900 1.399 -8.1
50 0.968 0.994 28.000 1.599 -28.9
7. 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 0.995 0.999 24.000 1.049 26
20
0.984 0.997 24.300 1.124 19
30 0.973 0.994 24.900 1.258 9
40 0.960 0.992 25.600 1.430 -6
50 0.943 0.989 26.600 1.650 -28
METHOD OF SELECTION
To select a YORK Packaged Air-Cooled Liquid Chiller, the following data must be known:
1. Design Capacity in tons refrigeration (TR).
2. Entering and Leaving Liquid Temperatures.
3. Outside ambient air temperature in °F.
4. GPM of chilled liquid.
Determine capacity requirements from the following formula:
GPM =
TR x 24
RANGE(°F)
EXAMPLE – WATER CHILLING
1. Given: Provide a capacity of 50 tons at 42°F leaving water at 10°F range. 0.0001FF,
85°F air on the condenser, at sea level and 60 Hz.
2. Find: Unit Size, Compressor KW Output from the ratings on page 24.
3. Select: YCAL0056 (English Units)
a. 54.4 Tons
b. 51.8 Compressor KW
c. 11.1 Unit EER