JOHNSON CONTROLS
12
5. From RATINGS on pages 16 - 46:
SELECT: YCAL0040 (English Units)
36.1 Tons
38.6 Compressor kW
6. Determine YCAL0040 brine cooling capacity
and Compressor kW requirement:
A. Tons = 36.1 x .974 x .983 = 34.6
B. Compr. kW = 38.6 x .995 x 1.021 = 39.2
7. Determine average full load Compressor kW at
34 tons:
34 tons x (39.2 kW) = 38.5 Compressor kW
34.6 tons
8. Determine Ethylene Glycol GPM:
GPM =
Tons x Gal. °F/min/Ton factor
Range
GPM =
34.0 x 26.1
10
GPM = 88.7
9. Determine Cooler Pressure Drop:
A. See Ethylene Glycol correction factors for
30% by weight Ethylene Glycol.
READ: 1.096 Pressure Drop Factor
B. See page 14 at 88.7 GPM for the YCAL0040.
READ: 6.5 Ft. H
2
O Pressure Drop
C. Cooler Pressure Drop = 6.5 x 1.096 or 7.1 Ft.
H
2
O
10. YCAL0040 is suitable.
3. From the Ratings on pages 16 - 46:
SELECT: YCAL0050 (English Units)
53.1 Tons
48.7 Compressor kW
11.7 Unit EER
4. Calculate Compressor kW at 50 Tons:
kW =
50
x 48.7kW = 45.9kW
53.1
5. Calculate GPM:
GPM =
50 Tons x 24
= 120 GPM
10°F Range
6. From Page 14, read 10 ft of water cooler pressure
drop for GPM:
7. A YCAL0050 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. al-
titude.
2. DETERMINE:
Unit Size
kW Input
Ethylene Glycol GPM
Cooler Pressure Drop
3. See Ethylene Glycol correction factors, for 30% by
weight Ethylene Glycol.
READ: .974 Tons factor
.995 Compr. kW factor
26.1 Gal./°F/Tons factor
4. See Performance Data Correction Factors for
0.00025 fouling factor and 4000 ft. altitude.
READ: .983 Tons factor
1.021 kW factor
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