Development and Evaluation of a Multi-Reflector Double Exposure Box-Type Solar Cooker
Solar cookers are known to present an alternative energy source for cooking but, there is need for new designs to overcome some of its setbacks. A multi-reflector double exposure box-type solar cooker was developed with a surface dimension of 670 mm × 670 mm and a collector area of 0.264 m2. It comprised an outer and inner box; a double glazing; an absorber plate (painted black); aluminium foil reflectors; saw dust (insulator) and aluminium pots (with reed-like protrusions added to the inner surface of the pot cover). The cooker was subjected to stagnation, water heating and cooking tests. The cooker’s thermal performance was analysed by estimating the heating power and the sensible heat efficiency. Results reveal a maximum stagnation temperature of 102 oC, rising at an average rate of 5.0 oC per 15 min. The maximum water temperature attained while heating 1 and 2 kg of water was 92.3 oC and 80.0 oC respectively. A maximum heating power of 32.4 W and 26.0 W was observed for 1 and 2 kg of water, respectively while their respective maximum heat efficiencies were; 14.0% and 21.2% respectively. This study reiterates the usability and suitability of solar cookers in a tropical region.
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