Phase Change Materials: peg
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 | density liquid kg m3 (kg/m3) | density solid kg m3 (kg/m3) | latent heat kJ kg (kJ/kg) | material name | max cycles | melting point C (C) | notes | phase change type | thermal conductivity liquid W mK (W/mK) | thermal conductivity solid W mK (W/mK) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| peg | peg_1000 | HO(CH2CH2O)nH | 1,060 | 1,093 | 159 | Polyethylene Glycol 1000 (PEG 1000) | 3,000 | 37 | Tm=35–40°C (peak ~37°C); body-temperature PCM for biomedical and textile thermoregulation applications. High latent heat-to-cost ratio. Fully water-soluble; compatible with polymer encapsulation. | solid-liquid | 0.19 | 0.23 |
| peg | peg_400 | HO(CH2CH2O)nH | 1,003 | 1,125 | 105.3 | Polyethylene Glycol 400 (PEG 400) | 3,000 | 5.8 | Lowest MW PEG grade with PCM behaviour; Tm=5.8°C suitable for cold storage. Liquid at room temperature in most climates. Non-toxic, non-corrosive, biodegradable. Relatively low latent heat vs higher MW grades. Widely used in cold-chain logistics PCM formulations. | solid-liquid | 0.18 | 0.19 |
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