14 Product Manual WHR-2
Selection Procedure
EW Water-Cooled, R-22
1. Ratings are based and certified in accordance with ARI Standard 550/590-98.
2. Ratings in Table 5 through Table 10 may be interpolated for any chiller water temperature
between 40°F and 50°F (4.4°C and 10.0°C) but cannot be extrapolated.
3. Chilled water quantities - Ratings are based on a 10 degree F (5.6 degree C) chilled water range
(2.4 gpm/ton) and can be used for a delta-T range of 6 to 16 degrees F (3.3 to 8.8 degrees C) by
adjustments from Table 3.
4. Figure 2 through Figure 4 give the evaporator water pressure drop data. Water flow rates
should be maintained within these limits, which are based on minimum and maximum flow.
5. Ratings are based on 0.0001 fouling factor for the evaporator. For other fouling factors,
multiply ratings by evaporator factors from Table 3. For applications using a glycol solution,
see Table 1 and Table 2.
6. Ratings are based on condenser flow of 3 gpm/ton (10 degree F, 5.6 degree C delta-T) and
0.00025 fouling factor. Corrections for other conditions are in the following Application
Section.
Selection Procedure
Knowing the required chiller capacity in tons, the leaving water temperature and either the chilled
water temperature range (Delta T) or the flow, determine the unknown quantity using the formula:
24
= Tons
TDeltaGPM ×
Knowing the required chiller capacity (tons), the entering condenser water temperature, and either
the condenser water temperature range-delta T, or the GPM, determine the unknown quantity using
the formula:
aterRangeCondenserW
30Capacity Cooling Tons Nominal
.Cond TDelta500
THR
=GPM Condenser
×
=
×
With the above data, the appropriate unit can be selected from Table 5 through Table 10. Pressure
drop for evaporators and condensers can be found in Figure 2 through Figure 4.
Sample Selection
Given: Cool 165 GPM of water from 54°F to 44°F with condenser water available at 85°F.
Condenser water temperature rise to be 10 degrees. Fouling factor of 0.0001 in the evaporator and
0.00025 in the condenser.
Find:
A. WHR packaged water chiller selection
B. Compressor power input
C. Condenser water flow rate
D. Evaporator and condenser water pressure drop
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