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Propylene Glycol based Heat-Transfer Fluids

Freezing points of propylene glycol based heat-transfer fluids suitable for the food processing industry.

For many heat-transfer applications it is necessary to use a heat-transfer fluid with lower freezing point than water. The most common antifreeze fluid - ethylene glycol - must not be used where there is a chance of leakage to potable water or food processing systems.

In food processing systems the common heat-transfer fluid is based on propylene glycol.

Freezing Points of Propylene Glycol based Water Solutions

Freezing point of propylene glycol based water solutions at different temperatures:

Propylene Glycol based Heat-Transfer Fluids - Freezing Points
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 19 29 40 50 60
Freezing Points oF 32 26 18 7 -8 -29 -55
oC 0 -3 -8 -14 -22 -34 -48

Due to slush creation - a propylene glycol and water solution should not be used close to freezing points.

Propylene glycol water solutions - freezing points

Specific Gravities of Propylene Glycol Solutions

Specific gravity of propylene glycol solutions:

Propylene Glycol based Heat-Transfer Fluids - Specific Gravities
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Specific Gravity - SG - 1) 1.000 1.008 1.017 1.026 1.034 1.041 1.046

1) Specific gravity based on propylene glycol solutions with temperature 60oF.

Densities of Propylene Glycol water Solutions

Propylene Glycol based Heat-Transfer Fluids - Densities
Mass Fraction of Propylene Glycol in SolutionDensity - ρ - (kg/m3)
Temperature - t - (oC)
-45-33-22-13-7-3020406080100
0 1000 998 993 983 972 958
0.1 1012 1012 1006 998 988 976 965
0.2 1023 1022 1022 1014 1004 992 980 967
0.3 1035 1034 1032 1031 1022 1010 997 983 969
0.4 1049 1047 1044 1043 1041 1030 1016 1002 987 971
0.5 1064 1061 1058 1055 1053 1051 1038 1023 1006 990 974
0.6 1080 1078 1074 1069 1065 1063 1061 1046 1029 1011 994 976

Boiling Points of Propylene Glycol Solutions

Boiling points of propylene glycol solutions:

Propylene Glycol based Heat-Transfer Fluids - Boiling Points
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Boiling Points (oF) 212 212 213 216 219 222 225
  • T(oC) = 5/9[T(oF) - 32]

Specific Heats of Propylene Glycol Solutions

Specific heat of propylene glycol solutions:

Propylene Glycol based Heat-Transfer Fluids - Specific Heats
Propylene Glycol Solution
(%)
by mass 0 10 20 30 40 50 60
by volume 0 10 20 29 40 50 60
Specific Heat
- cp -
(Btu/lb oF)
1.000 0.980 0.960 0.935 0.895 0.850 0.805
  • 1 Btu/(lbmoF) = 4186.8 J/(kg K) = 1 kcal/(kgoC)

Propylene glycol water solutions - specific heat

Related Topics

  • Boiling Points of Fluids

    Boiling points of elements, products and chemical species at varying conditions.
  • Material Properties

    Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.
  • Piping Systems

    Calculate dimensions of pipes and tubes. Pressure drop calculations and head loss charts. Use of different piping materials. Insulation of pipes and tubes and heat loss diagrams.

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