Phase Change Materials: paraffin
Phase change material (PCM) properties — melting point, latent heat, density, thermal conductivity, specific heat, and cycle life for paraffins, salt hydrates, fatty acids, and eutectics
| pcm category | material id | chemical formula | cycling stability | density liquid kg m3 (kg/m3) | density solid kg m3 (kg/m3) | latent heat kJ kg (kJ/kg) | material name | melting point C (C) | notes | specific heat liquid kJ kgK (kJ/kgK) | specific heat solid kJ kgK (kJ/kgK) | supercooling tendency | thermal conductivity liquid W mK (W/mK) | thermal conductivity solid W mK (W/mK) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| paraffin | n_docosane | C22H46 | excellent | 748 | 778 | 249 | n-Docosane (C22) | 44.4 | Medium-temperature paraffin PCM; solid-solid transition near 39°C adds ~10 kJ/kg to effective storage; good cycling stability | 2.28 | 1.89 | low | 0.14 | 0.48 |
| paraffin | n_hexacosane | C26H54 | excellent | 750 | 780 | 256 | n-Hexacosane (C26) | 56.4 | Higher paraffin PCM for 50-65°C range; solid-solid transition near 52°C; density from NIST/ChemicalBook 630-01-3 | 2.32 | 1.95 | low | 0.15 | 0.49 |
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