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

Abstract

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 43.90C. 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 50oC for the SCK was estimated to be
15.25W and 8.8Wduring the experimental period.