York YCAL0028EE - Page 15

FORM 150.67-EG1 (219)
JOHNSON CONTROLS
15
4. Calculate Compressor kW at 50 Tons:
kW =
50
x 51.8kW =47.6kW
54.4
5. Calculate GPM:
GPM =
(50 Tons)x 24
=120GPM
10°F Range
6. From page 18, read 6 ft of water cooler pressure drop from GPM: 16
A YCAL0056 is suitable.
EXAMPLE - BRINE CHILLING
1. Given: Provide a capacity of 34 tons cooling 30% by weight Ethylene Glycol from
50°F to 40°F, 0.00025FF, 95°F air on the condenser, 60°Hz and 4000 ft. altitude.
2. 2. Determine:
a. Unit Size
b. KW Input
c. Ethylene Glycol GPM
d. Cooler Pressure Drop
3. See Ethylene Glycol Correction Factors, for 30% by weight ethylene glycol.
READ: 0.984 Tons Factor
0.997 Compr. KW factor
26.1 Gal/ F/Tons Factor
4. See Performance Data Correction Factors for 0.00025 fouling factor and 4,000 ft.
altitude.
READ: 0.975 Tons factor
1.012 kW factor
5. From ratings on page 23.
Select: YCAL0046 (English Units)
35.3 Tons
41.1 Compressor kW
6. Determine YCAL0046 glycol cooling capacity and Compressor kW requirement
from page 23:
a. ONS: = 35.3 x 0.984 x 0.975 = 33.87
b. Compr. KW = 41.1 x 0.997 x 1.012 = 41.77
Selection Data (Cont'd)