Propylene Glycol based Heat-Transfer Fluids
Freezing points of propylene glycol based heat-transfer fluids suitable for the food processing industry
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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 the slightest 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 Point of Propylene Glycol based Water Solutions
Freezing point of propylene glycol based water solutions at different temperatures:
| Freezing Point | ||||||||
| Propylene Glycol Solution (%) | by mass | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| by volume | 0 | 10 | 19 | 29 | 40 | 50 | 60 | |
| Temperature | oF | 32 | 26 | 18 | 7 | -8 | -29 | -55 |
| oC | 0 | -3 | -8 | -14 | -22 | -34 | -48 | |
Due to slush creation propylene glycol and water solutions should not be used close to the freezing points.
Specific Gravity of Propylene Glycol Solutions
Specific gravity of propylene glycol is in the range
| Specific Gravity - SG - | |||||||
| Propylene Glycol Solution (%) | by mass | 0 | 10 | 30 | 40 | 50 | 60 |
| by volume | 0 | 10 | 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.
Boiling Points of Propylene Glycol Solutions
Boiling points of propylene glycol
| Boiling Point | |||||||
| Propylene Glycol Solution (%) | by mass | 0 | 10 | 30 | 40 | 50 | 60 |
| by volume | 0 | 10 | 29 | 40 | 50 | 60 | |
| Temperature (oF) | 212 | 212 | 213 | 216 | 219 | 222 | 225 |
- T(oC) = 5/9[T(oF) - 32]
Specific Heat Capacity of Propylene Glycol Solutions
Specific heat capacity of propylene glycol
| Specific Heat Capacity | |||||||
| Propylene Glycol Solution (%) | by mass | 0 | 10 | 30 | 40 | 50 | 60 |
| by volume | 0 | 10 | 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) = 4,186.8 J/(kg K) = 1 kcal/(kgoC)
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Related Topics
- Material Properties - Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids
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