Research Article
Performance of a Pebble Bed Thermal Storage Integrated with Concentrating Parabolic Solar Collector for Cooking
Table 6
Comparison of efficiencies for the conditions of higher and lower DNI.
| | DNI, highest | DNI, lowest |
| Solar energy on aperture area [MJ] | 60.1 | 18.1 | Stored energy [MJ] | 40.1 | 12.85 | Storage efficiency (%) | 66.7 | 70.9 | Volume of water boiled | 5 liter for 53 min | 5 liter for 4 h | Useful cooking energy [MJ] | 1.47 | 1.47 | Thermal efficiency of cooker (%) | 45 | 31.1 | Overall efficiency of cooker (%) | 30 | 22.08 |
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