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Table 4
Theoretical, measured and calculated data for the tests.
| Parameter | Oil-filled | Air-filled | Insulated | Conventional |
|---|---|---|---|---|
| Ambient Temperature during Water Boiling Tests (°C) | 32.25 | 34.00 | 32.29 | 31.62 |
| Ambient Temperature during Stagnation Test (°C) | 32.19 | 32.04 | 32.23 | 31.32 |
| Maximum Air Temperature during Stagnation Test (°C) | 90.07 | 119.44 | 124.22 | 92.69 |
| Maximum Absorber Plate Temperature during Stagnation Test (°C) | 98.75 | 141.24 | 128.19 | 153.96 |
| Initial Temperature of Water (°C) | 35.58 | 37.45 | 41.23 | 34.69 |
| Final temperature of water (°C) | 71.52 | 90.03 | 90.18 | 90.62 |
| Theoretical average beam radiation (W/m2) | 850.00 | 850.00 | 850.00 | 850.00 |
| Calculated average global radiation (W/m2) during stagnation test | 496.19 | 491.12 | 480.16 | 468.94 |
| Calculated average global radiation (W/m2) during water boiling test | 458.27 | 441.27 | 439.86 | 440.65 |
| Calculated beam radiation (W/m2) during water boiling test | 389.53 | 375.08 | 374.55 | 381.02 |
| Measured beam radiation at stagnation (W/m2) | 366.95 | 171.60 | 417.41 | 400.13 |
| Mass of water (kg) | 3.0 | 3.0 | 3.0 | 3.0 |
| Mass of cooking vessel (kg) | 1.1 | 1.1 | 1.1 | 1.1 |
| Mass of receiver (kg) | 14.0 | 5.9 | 6.9 | 1.1 |
| Specific heat capacity of water (J/kg °C) | 4187 | 4187 | 4187 | 4187 |
| Specific heat capacity of cooking vessel (J/kg °C) | 887 | 887 | 887 | 887 |
| Specific heat capacity of receiver (J/kg °C) | 510.90 | 510.90 | 510.90 | 887 |
| Surface area of receiver (m2) | 0.16 | 0.15 | 0.14 | 0.16 |
| Area of absorber (m2) | 0.04 | 0.04 | 0.03 | 0.04 |
| Aperture area of solar concentrator (m2) | 2.50 | 2.50 | 2.50 | 2.50 |
| Diffuse radiation factor | 0.15 | 0.15 | 0.15 | 0.15 |
| Time taken to boiling (s) | 5100 | 5820 | 3677 | 3210 |
| Ratio of aperture area to absorber area | 15.60 | 16.70 | 17.90 | 15.60 |
| Optical efficiency | 0.85 | 0.85 | 0.85 | 0.85 |
| Specific heat capacity of oil (J/kg °C) | 568 | N/A | N/A | N/A |
| Mass of oil (kg) | 3.50 | N/A | N/A | N/A |
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