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Engineering ToolBox > Propylene Glycol based Heat-Transfer Fluids
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 at different temperatures:
| Freezing Point | ||||||||
| Propylene Glycol Solution (% by mass) | 0 | 10 | 20 | 30 | 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 is in the range
| Specific Gravity - SG - | |||||||
| Propylene Glycol Solution (% by mass) | 0 | 10 | 20 | 30 | 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
| Boiling Point | |||||||
| Propylene Glycol Solution (% by mass) | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Temperature (oF) | 212 | 212 | 213 | 216 | 219 | 222 | 225 |
Specific heat capacity of propylene glycol
| Specific Heat Capacity | |||||||
| Propylene Glycol Solution (% by mass) | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
| Specific Heat - cp - (Btu/lb.oF) | 1.000 | 0.980 | 0.960 | 0.935 | 0.895 | 0.850 | 0.805 |