ClimaCool UCR Remote Air Cooled - Manual (Page 21)

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Propylene Glycol Sample Selection
(Select UCR030 Module)
Determine Capacity, kW, GPM and pressure drop for an
UCR030 module, given the following Inputs:
• CWTD = 10°F
• LCWT = 42°F
• TA = 95°F
• CTD = 30°F
30% Propylene Glycol/ 70% Water in Chiller
1. Determine saturated discharge temperature.
TSD = TA + CTD
TSD = 95°F+30°F = 125°F
2. From the Performance Tables:
Capacity: 27.2 Tons; kW: 30.6
3. First fi nd the water fl ow and pressure drop for pure
water as in the previous example.
GPM = (24) (27.2)/10 = 65.3 GPM
From Figure 1on page 20 read pressure drop from
mid curve as:
Pressure drop = 8.5 ft. of water
4. To convert performance data for pure water to data
using 30% Propylene Glycol, record the adjustment
multipliers from Figure AM-1 AM-2 on page 20:
Capacity factor: 0.97
kW factor: 0.988
GPM factor: 1.022
Pressure drop factor: 1.20
5. Calculate chiller performance using 30% Propylene
Glycol by multiplying the chiller performance data
for pure water by the adjustment factors as follows:
Capacity: 27.2 x 0.97 = 26.38 Tons
kW: 30.6 x 0.988 = 30.23 kW
GPM: 65.3 x 1.022 = 66.74 GPM
Pressure drop: 8.5 x 1.20 = 10.2 feet of water
Selection Procedure