Selection Data - Quantech QWC3 Manual

FORM QWC3-EG1 (217)

Selection Data

GUIDE TO SELECTION
Complete water chilling capacity ratings for QWC3 chillers are shown on the following
pages to cover the majority of job requirements. For any application beyond the scope of
this Engineering Guide, consult your nearest Quantech Sales Representative.
Selection Rules
1. Ratings – All QWC3 ratings are in accordance with AHRI Standard 550/590, at the
AHRI standard condi tions. Ratings not at standard AHRI conditions are rated in accor-
dance with AHRI rating procedures. These ratings may be interpolated but should not
be extrapolated.
Cond. GPM =
EVAPORATOR CORRECTION FACTORS
FF=TEMP SPLIT
TONS
6 0.976
8 0.990
10 1.000
12 1.009
14 1.017
2. Cooling Water Quantity – Ratings are based on 10ºF chilled water range with the
evaporator at sea level. Use the chilled water correction factors (below) for other
ranges except as limited by water pressure drop, minimum or maximum water flows
for the evaporator.
FF=TEMP SPLIT
TONS
6 1.020
8 1.010
10 1.000
12 0.990
14 0.980
Note: Temperature split factors @ 85ºF Entering Condenser Water Temp (ECWT)
3. Condenser Water Quantity – Ratings are applicable from 2 to 4 GPM/Ton. Use the
condenser water correction factors (below) for different ranges except as limited by
water pressure drop or minimum or maximum water flows for the condenser. Using
the heat rejection (MBH), the Condenser GPM is calculated as follows:
4. Fouling Factors – Ratings are based on 0.0001 evaporator and 0.00025 condens-
er fouling factor. For other fouling factors, consult the table below or contact your
Quantech Sales Representative.
18
MBH x 2
Cond. Water Range (ºF)
0.00010
COMPR KW
0.996
0.999
1.000
1.001
1.002
CONDENSER CORRECTION FACTORS
0.00025
COMPR KW
0.963
0.982
1.000
1.019
1.040
0.00025
TONS COMPR KW
0.969 0.997
0.960 0.996
0.991 0.999
0.999 1.000
1.007 1.001
0.00050
TONS COMPR KW
1.014 0.974
1.019 0.990
0.995 1.010
0.985 1.029
0.975 1.048
QUANTECH