Selection Data
GUIDE TO SELECTION
Complete water chilling capacity ratings for YORK YCWS chillers are shown on the following pages to cover the majority of job requirements. For any application be- yond the scope of this Engineering Guide, consult your nearest YORK Office.
SELECTION RULES
1.RATINGS - YCWS 200, 230 380, 460 &
2.COOLING WATER QUANTITY - Ratings are based on 10ºF chilled water range. Use the chilled water correction factors (below) for other ranges except as limited by water pressure drop, minimum or maximum water flows for the cooler.
3.CONDENSER WATER QUANTITY – Rating are ap- plicable from 2 to 4 gpm/ton as limited by water pres- sure drop or minimum or maximum water flows for the condenser. Using the tabulated MBH, the Cond. GPM is calculated as follows:
MBH x 2
Cond. GPM = Cond. Water Range (ºF)
4.FOULING FACTORS – Rating are based on 0.0001 evaporator and 0.00025 condenser fouling factor. For other fouling factors, consult the table below or con- tact your YORK representative.
EVAP FOULING FACTORS
|
|
| 0.0001 | x | 0.00025 | ||
| Temp | Tons | Compr |
| Tons | Compr | |
Split |
| kW |
|
| kW | ||
| 6 | 0.9692 | 1.0015 |
| 0.9972 | 1.0001 | |
8 | 0.9849 | 1.0008 |
| 0.9980 | 1.0001 | ||
10 | 1.0000 | 1.0000 |
| 0.9982 | 1.0001 | ||
12 | 1.0133 | 0.9993 |
| 0.9978 | 1.0001 | ||
| 14 | 1.0248 | 0.9986 |
| 0.9979 | 1.0001 |
Note: Temperature split factors @ 44ºF Leaving Chilled Liquid Temp
(LCLT)
COND FOULING FACTORS
|
|
| 0.00025 | x | 0.0005 | ||
| Temp | Tons | Compr |
| Tons | Compr | |
|
| Split | kW |
| kW | ||
|
|
|
| ||||
8 | 0.9998 | 1.0004 |
| 0.9957 | 1.0072 | ||
10 | 1.0000 | 1.0000 |
| 0.9959 | 1.0068 | ||
12 | 1.0001 | 0.9998 |
| 0.9961 | 1.0065 | ||
14 | 1.0001 | 0.9998 |
| 0.9965 | 1.0060 | ||
|
|
|
|
|
|
|
|
Note: Temperature split factors @ 95ºF Leaving Condenser Water Temp (LCWT).
METHOD OF SELECTION
If the duty requires a 10ºF range on both the cooler and condenser, see “Ratings”. For water ranges other than 10ºF, use the following procedure.
1.Determine capacity required from the following for- mula
Capacity (tons) = | GPM x Chilled Water Range (ºF) | |
24 | ||
|
2.After applying any fouling factor corrections, the ac- tual condenser heat rejection may be determined as follows:
Heat Rejection (Btuh) = (Tons x 12,000) + (kW x 3415)
Heat Rejection (MBH) = | Heat Rejection (Btuh) | |
1000 | ||
|
=(Tons x 12) = (kW x 3.415)
3.Determine condensing water requirements for water cooled models as follows:
Condenser Tons = | Heat Rejection (MBH) x 1000 | ||
15,000 |
| ||
|
| ||
Cond. Water GPM = |
| Condenser Tons x 30 | |
| Condenser Water Range (ºF) | ||
|
| ||
Or combine the two formulas: | |||
Cond. Water GPM = |
| MBH x 2 |
|
| Condenser Water Range (ºF) | ||
|
|
12 | YORK INTERNATIONAL |