York STYLE A YCWS User Manual

Page 13

FORM 201.24-EG1

YORK INTERNATIONAL

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.

GPM x Chilled Water Range

2. Capacity (tons) =

200 x 12

= 100TR

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

= 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

Tons x 12 = 95.0 X 12 = 15.4

EER =

4. Determine the cond. Heat rejection as follows:

Heat Rejection (MBH) = (Tons x 12) + (kW x 3.415)

= (95.0 x 12) + (74 x 3.415)
= 1140 + 253
= 1393

5. Determine GPM condensing water as follows:

GPM Condenser Water =

MBH x2

Cond Water Range

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