Abstract
Study aimed to develop and evaluate the thermal performance of truncated pyramid solar cooker viz non-modified and modified. Tests have been carried out in Department of Agricultural Engineering, Faculty of Agriculture, Ain Shams University, Shubra El-Kheima, Egypt (Latitude 30o11’ N, Longitude 31o24’ E). The solar cookers were not loaded, and loaded with 0.5, 1.0 and 2.0 liter of water. The modified truncated pyramid was filled with different quantities of rice. The thermal performance was evaluated by using first figure of Merit, second figure of Merit and energy efficiency. textural properties of rice and biscuits and cost analysis were measured. The absorber plate temperature of the modified was 51. 8 % higher than the absorber plate temperature of the non-modified cooker. The calculated values of first figure of Merit was 0.102 and 0.08 oC.m2/W with modified and non-modified truncated pyramid cooker types, respectively. The value of second figure of Merit was 0.239 and 0.523 for modified and non-modified truncated pyramid cooker, respectively.
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