Fluids / Propylene glycol, 30 % by volume
Thermal conductivity of propylene glycol, 30 % by volume vs temperature
A 30 % by volume propylene glycol solution, freeze protection to about −13 °C — the usual charge for a snowmelt or make-up air loop that only has to survive a Canadian shoulder season.
Thermal conductivity in W/(m·K), from -10 to 100 °C. The chart and the table below are the same numbers; the table is the one you can copy.
| Density | 1,024 kg/m³ |
| Specific heat | 3.87 kJ/(kg·K) |
| Dynamic viscosity | 3.4 mPa·s |
| Temperature (°C) | Thermal conductivity (W/(m·K)) | Row |
|---|---|---|
| -10 | 0.425 | published |
| 0 | 0.432 | published |
| 10 | 0.43862 | interpolated |
| 20 | 0.445 | published |
| 30 | 0.45125 | interpolated |
| 40 | 0.457 | published |
| 50 | 0.46181 | interpolated |
| 60 | 0.466 | published |
| 70 | 0.46981 | interpolated |
| 80 | 0.473 | published |
| 90 | 0.47519 | interpolated |
| 100 | 0.477 | published |
Rows marked published land exactly on a source anchor and are the tabulated figure. The rest are this library’s interpolation between the two anchors either side — good enough to design with, and said out loud so you can decide that for yourself.
ASHRAE Handbook—Fundamentals, Ch. 31 (Secondary Coolants), interpolated from published tables · validated -10 to 100 °C · interpolated between 7 published anchors (values held, not extrapolated, past the ends)