Abstract
Mathematical relations are developed to compute optimum inclination angle of booster mirror for horizontally placed cooker (λ) and for optimally inclined cooker (ψ) during all months (selected day) of the year at 30°N latitude for maximizing the reflected component of solar intensity onto the absorber plate of the cooker. A solar radiation model is also developed and used to compute the ratio of various solar intensities on horizontal, inclined and normal surface of the absorber plate for all months at 30°N latitude. These ratios give a clear indication of greater solar radiation availability on the optimally inclined cooker as compared to the horizontally placed cooker for faster cooking especially during winter months when solar radiation capture is small. Experimental validations have also been performed to access the accuracy of the developed relations and model.
Highlights
Many important modular studies have been performed on box type solar cookers till date to optimize their performance
Optimum tilt angle of the booster mirror is computed for all months and given latitude for maximizing the reflected radiation component onto the absorber plate
360 (284 + 365 n) on the Horizontal and Inclined Box Type Solar Cookers where “n” is the number of days starting from Januar= y 1. θz cos−1(cosφ.cosδ .cosω + sin δ .sinφ) (11)
Summary
Many important modular studies have been performed on box type solar cookers till date to optimize their performance. Parametric study of box type solar cooker was performed with and without booster mirrors called reflectors [3]. An improved box type solar cooker with tilted absorbing surface was developed but the problem of placing the food material could not be solved [5]. An optimally inclined box type solar cooker with modified cooking vessel design was presented [14]. Optimum Inclination Angles of Booster Mirrors and Solar Radiation Availability on the Horizontal and Inclined Box Type Solar Cookers vessel design. A mathematical model is developed to compute the optimum inclination angle of the booster mirror for horizontally placed and inclined cooker for maximizing the reflected component of the solar radiation for better performance during all months and selected latitudes
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