Energy and Exergy Efficiency Analysis for Solar Box Cooker with Kapook Insulator

Article history: Received 14 June 2020 Revised 20 June 2020 Accepted 25 June 2020 Available online 31 August 2020 This work presents evaluation of the energy end exergy efficiency of box-type solar cooker with Kapook Insulator (SCK). Thermodynamic considerations required to developed rational and meaningful methodologies for the evaluation and comparison of the efficiency of the SCK was studied. It was found that the average daily water temperature from 10:00 to 12:00 solar time was 85.02 in the SCK. The average daily temperature difference in the SCK was 43.9C. The energy output of the SC K ranged from 0.87 to 40.38W, for the time interval with an average energy output of 23.81Wfor SCK. The exergy output for the SCK ranged from 0.49 to 16.21 W, for the time interval with an average exergy output of 8.52W for SCK. A linear and polynomial regression of the plotted points was used to find the relationships between energy/exergy outputs, and efficiencies and temperature difference. The energy and exergy output at a temperature difference of 50C for the SCK was estimated to be 15.25W and 8.8Wduring the experimental period.