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    Modelling of Instant Solar Radiation Using Average Instant Temperature of Ogbomoso, South Western, Nigeria
    (İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2015-09-14) Adedokun, Oluwaseun; Abass, Aishat; Sanusi, Yekinni
    The paper is aimed at proffering an alternative means to the meteorological measuring stations by generating models for average instant solar radiation as a function of instant average temperature at places where measurement are not available. The data were processed using Microsoft excel software programming and regression analysis to generate a set of models for both morning and afternoon sessions of instant solar radiation of Ogbomoso as a function of temperature. In order to validate these models, statistical indicators like RMSE, MBE and MPE were used. The value of RMSE, MBE and MPE statistical indicators for morning and afternoon set of data were calculated to be 0.001219, -0.0000002, 0.0059% and 0.00033769, -0.00171225, -4.82%, respectively. From the t-test statics, percentage error between the measured and calculated values of instant average temperature, it is revealed that the set of models in this work can adequately be used in place of the data from the measuring stations since there is complementary relationship between the measured and the calculated instant solar radiation of Ogbomoso. And this modelling result could be used to estimate instant solar radiation at places where measurements are not available to design high performance solar radiation related devices.
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    Review on Natural Dye-Sensitized Solar Cells (DSSCs)
    (İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2016-06-22) Adedokun, Oluwaseun; Titilope, Kamil; Awodugba, Ayodeji Oladiran
    In a conversion system of pure and non-convectional solar energy to electricity, dye sensitized solar cells (DSSCs) encourage the fabrication of photovoltaic devices providing high conversion efficiency at low cost. The dye as a sensitizer plays a vital role in performance evaluation of DSSCs. Natural dyes (organic dyes) has come to be a worth-while substitute to the rare and expensive inorganic sensitizers because of its cost effective, extreme availability and biodegradable. Different parts of a plant like fruits, leaves, flowers petals and bark have been tested over the years as sensitizers. The properties, together with some other parameters of these pigments give rise to improve in the operation standard of DSSCs. This review hash-out the history of DSSC with a focus on the recent developments of the natural dyes applications in this specific area with their overall appearance, the various components and the working principle of DSSCs as well as the work done over the years on natural dye based DSSCs.