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Multicriteria analysis in selecting the optimal variant of solar system
摘要： Alternative energy sources are becoming more serious competition to traditional ways of generating energy. It becomes real integration of eco-energy with ecology, as well as the innovative technologies with low-energy construction. Apart from the cost an important issue are technical parameters of the equipment, durability, ease of installation, etc. The investor therefore is facing with the problem of decision-making to choose the best solution from the point of view of many criteria. In the article, the authors present the proposal to apply the methods of multi-criteria analysis to select the most beneficial variant of the solar system solutions. In this purpose will be use among other method: multivariate analysis of Saaty’s AHP, the taxonomic method of weighting factors and, belonging to a group of methods using outranking relations, the Promethee II method. Proposed comparative analysis can be used as a method for decision support during the selection of the most beneficial technological solution of solar installation and to evaluate operational efficiency existing buildings which will have implemented new systems.
关键词： solar system,Promethee II,decision-making,multi-criteria analysis,AHP
更新于2025-09-04 15:30:14
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Identification of photospheric activity features from SOHO/MDI data using the ASAP tool
摘要： The variation of solar irradiance is one of the natural forcing mechanisms of the terrestrial climate. Hence, the time-dependent solar irradiance is an important input parameter for climate modelling. The solar surface magnetic field is a powerful proxy for solar irradiance reconstruction. The analyses of data obtained with the Michelson Doppler Imager (MDI) on board the SOHO mission are therefore useful for the identification of solar surface magnetic features to be used in solar irradiance reconstruction models. However, there is still a need for automated technologies that would enable the identification of solar activity features from large databases. To achieve this we present a series of enhanced segmentation algorithms developed to detect and calculate the area coverages of specific magnetic features from MDI intensitygrams and magnetograms. These algorithms are part of the Automated Solar Activity Prediction (ASAP) tool. The segmentation algorithms allow us to identify the areas on the solar disk covered by magnetic elements inside and outside boundaries of active regions. Depending on their contrast properties, magnetic features within an active region boundary are classified as sunspot umbra and penumbra, or faculae. Outside an active region boundary magnetic elements are identified as network. We present the detailed steps involved in the segmentation process and provide the area coverages of the segmented MDI intensitygrams and magnetograms. The feature segmentation was carried out on daily intensitygrams and magnetograms from April 21, 1996 to April 11, 2011. This offers an exciting opportunity to undertake further investigations that benefit from solar features segmentations, such as solar irradiance reconstruction, which we plan to investigate in the future.
关键词： Magnetogram,Sunspot,Solar image processing,Spectral irradiance,Active region
更新于2025-09-04 15:30:14
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Piezo-phototronic effect on optoelectronic nanodevices
摘要： Optoelectronic nanoscale devices have wide applications in chemical, biological, and medical technologies. Improving the performance efficiency of these devices remains a challenge. Performance is mainly dictated by the structure and characteristics of the semiconductor materials. Once a nanodevice is fabricated, its efficiency is determined. The key to improving efficiency is to control the interfaces in the device. In this article, we describe how the piezo-phototronic effect can be effectively utilized to modulate the band at the interface of a metal/semiconductor contact or a p–n junction to enhance the external efficiency of many optoelectronic nanoscale devices such as photodetectors, solar cells, and light-emitting diodes (LEDs). The piezo-phototronic effect can be highly effective at enhancing the efficiency of energy conversion in today’s green and renewable energy technology without using the sophisticated nanofabrication procedures that have high cost and complexity.
关键词： photodetectors,light-emitting diodes,optoelectronic nanodevices,solar cells,piezo-phototronic effect
更新于2025-09-04 15:30:14
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Influence of Post-deposition Heat Treatments on the Optical Properties of Chemically Deposited Nanocrystalline TiO2 Thin Films
摘要： The aim of this study is to investigate the potentials of TiO2 thin films for device applications. Nanocrystalline single phase of rutile TiO2 thin films have been prepared by Chemical Bath Deposition (CBD) technique at bath temperature range from 75-80°C, keeping other deposition variables constant. The films were then subjected to post-deposition heat treatments with annealing temperatures in the range 373 to 673 K. The optical characterisation was done using the Elmer Lambda-2 spectrometer to investigate the transmittance and absorbance versus wavelength measurements. The data obtained from the transmittance and absorbance measurements were used to deduce the important optical constants. The results show that the energy bandgap was direct, with values in the range ≤1.8 eV for the as-deposited layers and ≥2.2 eV for the annealed layers. At lower temperatures, the band gaps of the annealed samples did not differ significantly from the energy gap (1.8 eV) of the as-deposited film. At higher thermal treatment, the energy gaps increased with the increase in annealing temperatures and a maximum of 2.2 eV for the energy gap was determined for TiO2 film annealed at 673 K. The values of the energy bandgap obtained in study, are within the range suitable for application in photovoltaic solar cell devices and in related photonic applications.
关键词： thermal annealing,Energy band gap,solar cells,TiO2
更新于2025-09-04 15:30:14
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Potential Application of Metal–organic frameworks for Photocatalytic Water Splitting
摘要： These days, the environmental pollution and energy shortage are the crucial global issues. Therefore, replacing the renewable source of energy with the fossil fuels is the most promising approach to solve the aforementioned problems. Hydrogen is an attractive source energy because of its high energy density and its combustion by-product is only water. Hydrogen production through photosplitting of water over a semiconductor based photocatalyst is a desirable approach to diminish the global energy and environmental problems. However, its low solar conversion efficiency and finding suitable photocatalyst still remain as the main challenge for this system. Recently metal–organic frameworks (MOFs) have received great attention for the photocatalytic hydrogen production due to their large surface to volume ratio, design flexibility, and well-defined porosity. In this short review, we focus on the previous studies on the various types of MOFs based photocatalyst in the solar hydrogen production system. The main intention of review is to highlight the importance of coupling molecular approaches of catalyst design with materials science strategies in the improvement of MOFs based photocatalysts, which will undoubtedly lead to a very bright future for photocatalytic water.
关键词： Solar Energy,Photocatalytic Water Splitting,Metal–organic frameworks,Hydrogen Production,Renewable Energy
更新于2025-09-04 15:30:14
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Co <sub/>3</sub> O <sub/>4</sub> nanoparticles decorated Ag <sub/>3</sub> PO <sub/>4</sub> as heterostructure for improving solar-light-driven photocatalysis
摘要： As a common photocatalytic material, Ag3PO4 still faces the challenge including the fast recombination of photo-generated electron-hole (e--h+) pairs. In this work, we prepared Co3O4/Ag3PO4 heterojunction with good optical properties by an in-situ precipitation method. Compared to pure Ag3PO4, the Co3O4/Ag3PO4 exhibited greatly improved photocatalytic activities for degradation methylene blue (MB) and bisphenol A (BPA) under the visible light irradiation. Here, the degradation rate of MB could reach up to 12% which is about 35% higher than that of pure Ag3PO4, after 18 min irradiation. The degradation rate of BPA could reach up to 33% which is about 45% higher than the pure Ag3PO4. This work may provide insight for finding a new Ag3PO4 photocatalyst for promoting the photocatalytic performance
关键词： solar-light-driven,degradation,heterostructure,Co3O4/Ag3PO4,photocatalysis
更新于2025-09-04 15:30:14
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[IEEE 2018 International CET Conference on Control, Communication, and Computing (IC4) - Thiruvananthapuram (2018.7.5-2018.7.7)] 2018 International CET Conference on Control, Communication, and Computing (IC4) - Comparative Study of Adaptive Single Sensor Based MPPT for PV Applications with Conventional Algorithms
摘要： Photovoltaic (PV) Systems are becoming vital for the existence of mankind nowadays. From bulk power generation to space exploration applications, PV systems finds an important role. To extract power from PV device it has to be operated at its Maximum Power Point(MPP) for which different MPPT algorithms are used. On a relative study of these different MPPT algorithms it is found that most of them suffers from certain problems such as highly oscillatory response and slow tracking time. Most of these algorithms uses both current and voltage sensors, this adds to the issue of reliability of such MPPTs. Here in this study, a Single voltage sensor based Adaptive MPPT is using different MPPT compared with MATLAB/SIMULINK simulations.
关键词： MATLAB/Simulink,Adaptive Voltage Sensor based MPPT,Maximum Power Point Tracking (MPPT),Solar power,Single Ended Primary Inductance Converter (SEPIC)
更新于2025-09-04 15:30:14
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Approaching 23% with large‐area monoPoly cells using screen‐printed and fired rear passivating contacts fabricated by inline PECVD
摘要： We present n‐type bifacial solar cells with a rear interfacial SiOx/n+:poly‐Si passivating contact (‘monoPoly’ cells) where the interfacial oxide and n+:poly‐Si layers are fabricated using an industrial inline plasma‐enhanced chemical vapor deposition (PECVD) tool. We demonstrate outstanding passivation quality with dark saturation current density (J0) values of approximately 3 fA/cm2 and implied open‐circuit voltage (iVoc) of 730 mV at 1‐sun conditions after firing in an industrial belt furnace. Using a simple solar cell process flow that can be easily adapted for mass production, a peak cell efficiency of 22.8% with a cell open circuit voltage (Voc) of 696 mV is achieved on large‐area, screen‐printed, Czochralski‐silicon (Cz‐Si) solar cells using commercial fire‐through metal pastes.
关键词： silicon wafer,screen‐printed,industrial process,passivated contacts,industrial firing,PECVD,solar cells,large‐area
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Kannur,Kerala, India (2018.3.23-2018.3.24)] 2018 International Conference on Control, Power, Communication and Computing Technologies (ICCPCCT) - Inverter Control Strategies in Solar PV Systems with Adaptive DC Link Technology - A Review
摘要： Ever-rising concerns on climatic changes and accelerated depletion of fossil fuels raised by the world needs an immediate action to accelerate the clean energy generation with available renewable energy resources (RES). Hence the involvement of alternative energy sources is growing at a faster pace. There are many renewable sources like solar, wind, hydro, geothermal, etc but only a few pertain the adequate potential. Alternative from solar energy for daily needs is one such platform which has immense potential and is universally accessible with least environmental effects. Solar photovoltaic (PV) is a promising solution for extracting solar energy. Along with the growing dependence, there is a thriving need for the development and advancement of the technologies presently on the deck. This is a platform which needs the ultimate attention in the current scenario. This paper focuses on the analysis of the available trends in inverter technology for grid tied solar PV systems to make it fast and reliable thereby reducing losses and mitigating harmonics. Some of the inverter control strategies will be discussed here to improve the overall efficiency of the system by modifying synchronous reference frame (SRF) technique. The adaptive dc link technology is being focussed in all the topologies as it helps in reducing the switching losses in the system.
关键词： Adaptive DC Link,RES,Solar PV,SRFT
更新于2025-09-04 15:30:14
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[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - From Solar Microgrid Simulation to Field Deployment: Accuracy and Uncertainties
摘要： Economical, stand-alone, solar microgrids can be quickly implemented in most un-electrified regions of the world. Solar resource maps developed by the National Aeronautics and Space Administration (NASA) and the National Renewable Energy Laboratory (NREL), together with HOMER Pro software, have been widely used to determine the optimal design of microgrids. Repercussions of imprecise predictions of solar resources and electrical power generation lead to an increased likelihood of energy shortage in a stand-alone microgrid, or increases overall project costs. Actual solar energy productions of two sites in Kerala, India, were compared with solar electricity generation, predicted by the HOMER Pro tool. For both test sites, the results showed that the simulated, solar production was within 8.1% of the actual annual production. However, monthly variations in solar production led to unanticipated energy shortages in the simulated microgrids. These findings reaffirm the inexorable need of the following actions for cost-effective design of microgrids: a) systematic analysis of reliability of electrical supply, and b) deployment of schemes for demand response and flexible load. Statistical analysis of temporal variation of solar irradiance in the United States were used to inform recommendations for stand-alone microgrid design.
关键词： accuracy,HOMER,solar,resource,model,microgrid,design
更新于2025-09-04 15:30:14