Owner's manual

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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