York YCWL Series - Solution; Sample Selection

JOHNSON CONTROLS
FORM 150.26-EG1 (116)
20
Or combine the two formulas:
Cond. Water GPM =
Condenser Tons x 30
Condenser Water Range (ºF)
SAMPLE SELECTION
Water Cooled Chiller (YCWL)
GIVEN – Chill 200 GPM of water from 56ºF to 44ºF and 0.0001 evaporator fouling factor
with 85ºF to 95ºF condensing water available. The fouling factor is 0.0005 for the con-
denser.
FIND – The required unit size capacity, kW, EER, and water pressure drop.
SOLUTION:
1. Chilled water range = 56ºF - 44ºF = 12ºF and correction factors are 1.009 for Tons
and 1.001 for kW for the evaporator.
Capacity (Tons) =
GPM x Chilled Water Range
24
=
200 x 12
24
= 100TR
2. From the rating, a model YCWL01180SE has a capacity range required. For the
evaporator leaving water temperature of 44ºF and a condenser leaving water tem-
perature of 95ºF, the unit capacity rating table indicates:
Tons = 108.4
KW = 83.5
EER = 15.6
Correcting for the 12ºF chilled water range and the 0.0005 condenser-fouling fac
tor (Correction factors for the condenser are 0.995 for Tons and 1.010 for kW):
Tons = 108.4 x 1.009 x 0.995 = 108.8TR
KW = 83.5 x 1.001 x 1.010 = 84.4 kW
Selection Data (Cont'd)