Experimental Studies of Solar Box Cooker Using Energy and Exergy Efficiency Analysis in a Semi-Arid Environment

H. Musa, Maina M. B., A. T. Abdulrahim

Abstract


This work presents evaluation of the energy end exergy efficiency of box-type solar cooker (SC) in Maiduguri (North-eastern Nigeria). Energy and exergy analysis was applied to solar cooker (SC). Thermodynamic considerations required to developed rational and meaningful methodologies for the evaluation of the efficiency of the SC was studied. It was found that the average daily water temperature from 10:00 to 12:00 solar time was 83.5 oC in the SC. The average daily temperature difference in the SC was 42.4 0C. The energy output of the SC varied between 1.38W and 49.58 W for the SC for the same time interval with an average energy output of 25.9 W SC. The exergy output for the SC ranged from 0.81W to 18.67 W for the SCK for the same time interval with an average exergy output of 8.67W for SC. A linear and polynomial regression of the plotted points was used to ï¬nd the relationships between energy/exergy outputs, and efficiencies and temperature difference. The energy and exergy outputs at a temperature difference of 50 oC for the SC was estimated to be 14.48 W and 9.95 W. The energy efficiency for the SC was in the range 0.29% –10.75% and exergy efficiency in the range of 0.18% –5.21% during the experimental period.


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References


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