Pro Refrigeration CHILSTAR Series Operation Manual page 21

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Calculating the amount of Glycol Required per job
1. To calculate the quantity of fluid within cooling system.
E. Multiply total system volume by glycol percentage required.
C. Fermenter Cooling Jackets: 8 fermenters @ 6 gallons each = 48 + 89 1/2 = 137 1/2 gallons
A Refractometer (Glycol Percentage Tester) must be used to determine actual solution freeze point.
These are available from your Propylene Glycol Supplier or contact us at (253) 735-9477.
Nominal
Pipe Size Diameter
Inches
1 1/4"
1 1/2"
2"
2 1/2"
3"
3 1/2"
4"
5"
6"
8"
10"
A. Use chart #2 to estimate Process Piping Volume.
B. Add Total from step A to chiller glycol tank capacity.
C. Add total from step B to Total Process Heat Exchanger Volume Capacity
D. Use chart #1 to find percentage concentration.
Example: Brewery Application with Fermenters as Process Heat Exchangers
A. Process Piping: 250 ' of 1 1/2" pipe = 26 1/2 gallons
B. Chiller Tank Capacity: 63 gallons + 26 1/2 gallons = 89 1/2 gallons
D. System requires -5 F. freeze point or 39% Glycol concentration.
E. 39% of 137 1/2 gallons = 53.63 gallons of Propylene Glycol Required.
Chart #2
Inside
Gallons per
Inches 100 feet of pipe
1.38
1.61
2.067
2.469
3.068
3.548
1.026
5.047
6.065
7.981
10.02
Volume
7.76
10.58
17.43
24.87
38.4
51.36
66.13
103.9
150.1
259.9
409.6