York STYLE A YCWS User Manual page 13

SAMPLE SELECTION
Water Cooled Condenser (YCWS)
GIVEN – Chill 200 GPM of water from 56ºF to 44ºF and
0.0001 evaporator fouling factor with 85ºF to 95ºF con-
densing water available. Fouling factor of 0.0005 spe-
cial field for the condenser.
FIND – The required unit size capacity, kW, EER, and
water pressure drop.
SOLUTION:
1. Chilled water range = 56ºF - 44ºF = 12ºF and correc-
tion factors are 1.0133 for Tons and 0.9993 for kW for
the cooler.
2. Capacity (tons) =
200 x 12
=
24
2. From the rating, a model YCWS0120SC has a ca-
pacity range required. For the cooler leaving water
temperature of 44ºF and a condenser leaving water
temperature of 95ºF, the unit capacity rating table in-
dicates:
Tons = 110.3
KW = 86.2
EER = 15.4
Correcting for the 12ºF chilled water range and the 0.0005
condenser-fouling factor:
Tons = 110.3 x 1.0133 x 0.9961 = 111.3TR
KW = 86.2 x 0.9993 x 1.0065 = 86.7
The unit is suitable.
3. Determine the average full load kW and EER at 95.0
Tons
95.0 X (86.7) = 74KW
111.3
YORK INTERNATIONAL
GPM x Chilled Water Range
24
= 100TR
Tons x 12 = 95.0 X 12 = 15.4
EER =
Kw
4. Determine the cond. Heat rejection as follows:
Heat Rejection (MBH)
5. Determine GPM condensing water as follows:
GPM Condenser Water =
6. From curves on pages 10 and 11, the pressure drops
with 200GPM through the cooler and 288 through the
condenser of the Model YCWS120SC
Cooler Pressure Drop at 200 GPM = 2.9ft
Condenser Pressure Drop at 288 GPM = 5.5ft
FORM 201.24-EG1
74
= (Tons x 12) + (kW x 3.415)
= (95.0 x 12) + (74 x 3.415)
= 1140 + 253
= 1393
MBH x2
Cond Water Range
13