Open Access
Table 1
Selection of seven roasting experiments: summary of main parameters and results.
| Test number # (−) | 2 | 5 | 20 | 8 | 9 | 10 | 14 |
| Scheffler concentrator size (m 2 ) | 8 | 8 | 8 | 2.7 | 2.7 | 2.7 | 2.7 |
| Drum volume (L) | 43.5 | 43.5 | 43.5 | 13.5 | 13.5 | 13.5 | 13.5 |
| Average solar irradiance Φ m (W/m 2 ) | 830 | 825 | 950 | 920 | 920 | 910 | 930 |
| Drum properties | |||||||
| Insulation around drum (−) | Yes | Yes | Yes | No | Yes | Yes | Yes |
| Inclination backward (°) | 13 | 32 | 20 | 20 | 20 | 14 | 32 |
| Rotational speed (rpm) | 8 | 8 | 18 | 18 | 18 | 18 | 19 |
| Absorptivity (−) | Low | Low | High | High | High | High | High |
| Date (day) November 2014 | 3 | 3 | 17 | 8 | 8 | 8 | 11 |
| Time (h:min) | 9:02 | 11:15 | 10:00 | 10:30 | 11:45 | 12:45 | 11:24 |
| Initial cacao mass (kg) | 3 | 6 | 6 | 2 | 2 | 1 | 2 |
| Final cacao mass (kg) | 2.8 | 5.6 | 5.55 | 1.88 | 1.87 | 0.8 | 1.85 |
| Total clouds duration (min:s) | 0 | 20:00 | 16:48 | 0 | 0 | 2:30 | 0 |
| Final temperature (°C) | 140 | 143 | 158 | 135 | 145 | 153 | 140 |
| Roasting time at 140 °C (min:s) | 32:58 | 64:53 | 50:00 | 32:25 | 20:39 | 20:52 | 32:18 |
| Net roasting time at 140 °C (min/kg) | 11 | 7.48 | 5.53 | 16.2 | 10.3 | 18.4 | 16.1 |
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