Effects of External Magnetic Field and Air Mass on Space Charge Region Width Extension of a Bifacial Solar Cell Front Side Illumination
Alain Diasso,
Raguilignaba Sam,
Nazé Yacouba Traoré,
François Zougmoré
Issue:
Volume 9, Issue 3, May 2020
Pages:
29-34
Received:
29 June 2020
Accepted:
29 July 2020
Published:
30 July 2020
Abstract: The environmental and economical merits of converting solar energy into electricity via photovoltaic cells have caused an ever increasing interest among developed and developing countries to allocate more budget on photovoltaic systems in order to boost up their efficiency in recent years. Besides the material and design parameters, there are several external factors such as magnetic field, air mass, intense light, external electric field, solar spectrum…. that can influence the PV cell’s performance. There have been a handful of studies conducted on the effect of various influential parameters on the efficiency and performance of photovoltaic cells; however none has taken these two parameters (magnetic field and air mass) into account simultaneously. In this 3D study the effects of magnetic field and the air mass illumination on space charge region width extension of a bifacial polycristalline solar cell front side illumination will be elaborated. Based on the columnar model of the grain and the quasi-neutral base, the continuity equation is established and the boundaries conditions are defined in order to use Green’s functions to solve this equation. New analytical expression of charge carriers’ density is found and the diffusion capacitance to the junction is calculated. The normalized carriers’ density plot versus base depth and magnetic field with various air mass illumination are presented and analyzed. The effects of magnetic field and air mass illumination on space charge region width extension are then deducted. The influences of magnetic field and air mass illumination on the junction capacitance and on the reverse of junction capacitance are also shown and analyzed.
Abstract: The environmental and economical merits of converting solar energy into electricity via photovoltaic cells have caused an ever increasing interest among developed and developing countries to allocate more budget on photovoltaic systems in order to boost up their efficiency in recent years. Besides the material and design parameters, there are sever...
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Anaerobic Digestion of Parthenium Weed with Goat Manure to Generate Biogas Energy
Getu Hailu,
Meseret Chimdessa
Issue:
Volume 9, Issue 3, May 2020
Pages:
35-40
Received:
3 June 2020
Accepted:
19 June 2020
Published:
30 July 2020
Abstract: The aim of this study was to obtain the optimal Mix ratio for biogas production from anaerobic digestion of Parthenium weed and goat manure. The experiment was batch operated and daily gas yield from the plant was monitored for 30 days. The Parameters studied were total solids (TS) and volatile solids (VS), fixed solids, organic carbon, and moisture content. For the experimental design, different mix ratios were adopted for the five digesters employed. In this case, for the first digester, 100% goat manure was used. For the 2nd digester 75%GM and 25% PW were used. The 3rd digester was filled with GM and PW in 1:1 ratio. The 4th digester contained 25%GM and 75% PW. the last digester contained only PW. The gas production rate was measured on daily basis using water displacement method. Gas production was noticed in all of the substrates types from the second and third day of digestion and went to zero at about 28 days in all digesters. The experimental data shows a greatest gas output of 572.5ml of gas production in the mix ratio of 75%GM and 25% PW, suggesting this mix ratio of the two substrates is an optimal mix to yield the highest biogas production. All measured TS, VS, PH, organic carbon and moisture content were significantly varied between before and after AD. Overall results indicates that the biogas yield and VS and TS reduction can be significantly enhanced when GM and PW are co digested.
Abstract: The aim of this study was to obtain the optimal Mix ratio for biogas production from anaerobic digestion of Parthenium weed and goat manure. The experiment was batch operated and daily gas yield from the plant was monitored for 30 days. The Parameters studied were total solids (TS) and volatile solids (VS), fixed solids, organic carbon, and moistur...
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