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| Table 1 heat transfers coefficients4 | ||
| Ammonia W/m2 °C | R22 W/m2 °C | |
| Condensation along the outside of tubes | 3500 to 7000 | 1200 to 2000 |
| Condensation inside tubes | 2500 to 6000 | 1000 to 1800 |
| Evaporation along the outside of tubes | 600 to 6000 | 300 to 3500 |
| Evaporation inside tubes | 1000 to 6000 | 450 to 1800 |