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Different refrigerants characteristics.
| Refrigerant | Molecular weight (g/mol) | Boiling point (∘C) | Freezing point (∘C) | Critical temperature (∘C) | Critical pressure (MPa) | Latent heat (kJ/kg) |
|---|---|---|---|---|---|---|
| R12 | 120.9 | −29.8 | −158 | 112 | 4.14 | 166.2 |
| R134a | 102 | −26.1 | −104 | 101.1 | 4.06 | 217 |
| R290 | 44.1 | −42.1 | −188 | 96.7 | 4.25 | 421.4 |
| R600a | 58.12 | −11.7 | 160 | 134.7 | 3.64 | 364.4 |
