Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 5 Articles
Sun position and the optimum inclination of a solar panel to the sun vary over time throughout the day. A simple but accurate solar\nposition measurement system is essential for maximizing the output power from a solar panel in order to increase the panel\nefficiency while minimizing the system cost. Solar position can be measured either by a sensor (active/passive) or through the\nsun position monitoring algorithm. Sensor-based sun position measuring systems fail to measure the solar position in a cloudy\nor intermittent day, and they require precise installation and periodic calibrations. In contrast, the sun position algorithms use\nmathematical formula or astronomical data to obtain the station of the sun at a particular geographical location and time. A\nstandalone low-cost but high-precision dual-axis closed-loop sun-tracking system using the sun position algorithm was\nimplemented in an 8-bit microcontroller platform. The Astronomical Almanacâ??s (AA) algorithm was used for its simplicity,\nreliability, and fast computation capability of the solar position. Results revealed that incorporation of the sun position\nalgorithm into a solar tracking system helps in outperforming the fixed system and optical tracking system by 13.9% and 2.1%,\nrespectively. In summary, even for a small-scale solar tracking system, the algorithm-based closed-loop dual-axis tracking\nsystem can increase overall system efficiency....
Solar energy is replacing more and more traditional sources of energy because\nof the fact that itâ??s also fighting about global warming. This study is based on\nexergy analysis of a double-effect series flow absorption refrigeration system\npowered by solar energy in Ngaoundere. The simulation is done on the basis\nof a half hourly analysis for the first time, from 6.30 AM to 6.30 PM, using\nwater-lithium bromide as working pair. The main parameters for the performance\nof an absorption cycle, which are the COP and the ECOP, have been\nanalyzed and the results show that this two parameters increase while increasing\nthe temperature of the main generator. The exergy loss of each\ncomponent of the system and the total exergy loss of the system have been\nanalyzed and their effectiveness calculated, using the first and second law of\nthermodynamics. The highest exergy loss occurs in the main generator GI\nand in the absorber, making these components more important in an absorption\ncycle. This analysis is based on a mathematical model using FORTRAN\nlanguage. The results obtained may be useful for the optimization of solar\nabsorption refrigeration systems....
Various metals, including zinc (Zn), nickel (Ni), aluminum (Al), chromium\n(Cr), gallium (Ga), lead (Pb), copper (Cu) and indium (In), may be released\nand cause contamination when scrapped end-of-life (EoL) Cu(InGa)Se2\nthin-film solar panel (CIGS TFSP) is buried in the soil. In this study, we grew\nBrassica parachinensis L. H. Bariley (VegBrassica) in three different types of\nsoils, namely, a commercial soil, a Mollisol, and an Oxisol, which had been\ncontaminated by CIGS TFSP to various extents. The concentrations of contaminants\nin these soils were positively correlated with both the amount of\nCIGS TFSP added and the burial period. Plants grew well in commercial soil\nand Mollisol, but those in Oxisol showed prominent signs of chlorosis and\ndied after 30 days. The bioaccumulation factor (BF) and concentration of Zn\nin VegBrassica grown in commercial soil with 10% of CIGS TFSP added were\n3.61 and 296 mg/kg, respectively, while the BF and concentration of In of\nVegBrassica grown in Mollisol were 3.80 and 13.72 mg/kg, respectively. The results\nshowed that soils were contaminated by metals released from CIGS\nTFSP, and different adsorption patterns were observed for VegBrassica depending\non which types of metals associated with the soil properties....
The paper studies PV panel and battery sizing of a linear Fresnel mirror or solar concentrator that has the potential in treating waste water and converting them into freshwater condensate. In a recent experimental study in Solar tracking, the research mentions the use of a 1.5 KW stepper motor and various other automation modules for controlling the orientation of the mirrors throughout the day. The stepper motor and the automation of the mirrors however is controlled using non-renewables. This paper proposes a PV sizing for the entire setup of light tracking in details and its performance at different months of the year. The case study is performed for the region of Goa which is located in India....
Influence of temperature on effective value of a current density of a semiconductor\nsolar cell is investigated. New equations for explanation of dependence\nof photovoltaic characteristics of solar cell from temperature are received....
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