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Accepted Manuscripts

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research-article  
Majid Horoufiany and Reza Ghandehari
J. Sol. Energy Eng   doi: 10.1115/1.4041930
Low distance between PV arrays can lead to the mutual shading between them, which can lead to the significant power losses. These shadows can be usually seen in PV plants with limited land such as buildings' roof. In this paper, a PV arrays fixed reconfiguration method is presented for reducing effects of one and two-sided mutual shadings in Total Cross Tied (TCT) arrangements. Two-sided mutual shading appears when the array is shaded in two separate areas, while in one-sided mutual shading, there is only one shaded part in the array. In this method, physical locations of modules are rearranged without changing the electrical interconnections. For reducing effects of these shading, their important features are initially explained. Then the optimal array rearrangement is determined by considering all possible mutual shadows. In mutual shading conditions, the obtained arrangement is capable to equally disperse shaded modules in different array rows, while it is no need to any additional switches or sensors. Due to this equal dispersion, there is no need to use the bypass diodes for maximum power extraction in this condition. The simulation results show the effectiveness of this method.
TOPICS: Shades and shadows, Roofs, Simulation results, Switches, Structures, Sensors
research-article  
Felipe C. Tedesco, Alexandre J. Bühler and Sérgio Wortmann
J. Sol. Energy Eng   doi: 10.1115/1.4041931
The growing demand for alternative technologies of clean and sustainable nature, has stimulated the development and improvement of equipment that uses solar energy for drying seeds and fruits. Such equipment has been used worldwide for hundreds of years, however, it remains uncommon in Serra Gaúcha, a region of large production of grapes and apples for consumption in natura in the state of Rio Grande do Sul - Brazil. In order to investigate the economic and technical viability of solar dryers in the Serra Gaúcha this work has as target the design, simulation, construction and experimental analysis of an Indirect Passive Solar Dryer with Chimney. The prototype is divided in three parts: solar collector, dehydration chamber and chimney. It was built prioritizing low cost materials, not compromising its performance. The device was submitted to experiments, which observed: solar collector behavior very close to the simulated one, obtaining a coefficient of performance of 87% for the equipment; satisfactory rise in temperature at the collector outlet comparing to its inlet; and dehydration of apples with a reduction of 89% for mass with 32.78 MJ of energy delivered to the system. The prototype payback period was estimated in two years.
TOPICS: Construction, Solar energy, Design, Solar collectors, Engineering prototypes, Temperature, Drying, Simulation, Sustainability, Experimental analysis, Dryers
research-article  
Beena Patel, Bharat Gami, Vipul Baria, Akash Patel and Pankaj Patel
J. Sol. Energy Eng   doi: 10.1115/1.4041899
Sustainable use of land and water is crucial in the era of climate change. Abellon CleanEnergy has established 3 MW solar plant practicing agricultural under the solar panels to address food and energy security involving a rural community. This innovation is first of its kind named as "solar-agri-electric model". The water used for washing the solar panels to maintain efficiency by dust removal, irrigates agriculture produce under the panels. This gives 24-34 tones/hectare/year agriculture produced by reusing 78 lac liters water/year and capturing 250 tons of CO2 in vegetables as food. The 3 MW solar project is registered under Clean Development Mechanism (CDM) under UNFCCC that reduces 1 lac MT CO2 emissions over 25 years vis-a-vis fossil-fuels. Around 52 MT/year post harvested residues are used for organic fertilizer, composting and fodder. Compound wall to safeguard the project site allowed creeper vegetables to grow and reduces dust deposition on the panels through wind breaking filtration. This initiative enhanced degree of sustainability along with local employment of 215 people from 4 villages including 156 women. In India, 1059.64 MW installed solar plants have potential to sequester 1600000MT CO2/year with abilities of 10000MT of agricultural produce that could employ 2000 people. Worldwide solar farms have potential to sequester 143000 MTCO2 through vegetation producing 100000MT of agriculture produce annually. Efficient use of natural resources requires facilitation of local/regional policies with reference to climatic condition, agricultural potential and availability of natural resources.
TOPICS: Solar energy, Combined heat and power, Water, Carbon dioxide, Natural resources, Sustainability, Food products, Fossil fuels, Wind, Climate change, Emissions, Innovation, Security, Fertilizers, Filtration, Dust, Dust removal, Composting
Review Article  
Nur Alom and Ujjwal K. Saha
J. Sol. Energy Eng   doi: 10.1115/1.4041848
The blade profiles and blade shapes of vertical-axis Savonius wind turbine rotors have undergone a series of changes over the past three decades. Wind turbine aerodynamicists have carried out numerous computational and experimental research to arrive at a suitable rotor blade design configuration so as to harvest maximum energy from the available wind. In most of the studies, the geometric and aerodynamic aspects of the rotor blade design have been reported. Interestingly enough, a couple of review papers got published in the area of Savonius rotors during last one decade. However, there is not a single piece of literature that gives a comprehensive and a systematic review of Savonius rotor blade profiles and shapes. This paper aims to collate all the research findings related to these blade profiles/shapes and makes an attempt to highlight their features together with future recommendations.
TOPICS: Rotors, Blades, Shapes, Savonius wind turbines, Design, Wind, Wind turbines
research-article  
Laurent Bodini, Laurent Delale, Jean-Luc Nouet and Bernard Durmercq
J. Sol. Energy Eng   doi: 10.1115/1.4041845
This paper aims to present the control laws that have been used for the Concentrated Solar Power (CSP) plant in Dhursar India by Areva Solar. The technology (Linear Fresnel Reflector (LFR), Direct Steam Generation, Once Through) used to produce overheated steam although being the most direct is also the most challenging for the controls. The main control laws which are presented are the flow control and the energy input control. With these control laws, the plant has been able to produce 110MWe.
TOPICS: Boilers, Power stations, Solar energy, Steam, Concentrating solar power, Flow control

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