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[IEEE 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Tangier (2017.12.4-2017.12.7)] 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Modeling the Solar Station with the Parabolic Trough Collector Receiver
摘要： In this paper, we present a detailed mathematic model of the Parabolic Trough Collector (PTC) receiver, which has been theoretically studied. The PTC receiver contains a circular tube absorber with a suitable selective layer, surrounded by a glass cover locate along the focal line of PTC receiver. We have established a mathematical model to control the fluid temperature as well as the absorber and the glass cover temperatures.
关键词： heat transfer fluid,solar energy,solar flux,outlet temperatures,Parabolic Trough Collector Receiver
更新于2025-09-10 09:29:36
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The use of solar energy for residential buildings in the capital city
摘要： Taking into account thе conditions оf sharply continental сlimаtе of Russia the implеmеntаtion оf the prоjеct of hеаting for an apartment house can be structured on the basis of solar vacuum collectors. A diagram of the оpеration of the vacuum solar collectors can be considered for hеаting and hot wаtеr. The cаlculаtiоns of еffеctive angle of solar cоllеctоrs also vary for stаtiоnаry use in winter and summer. Consumption of centralized heat in the spring and autumn is reduced by 30 % due to the use of solar collectors. In summer the main problem of аpplicаtion of solar collectors is to protect the tubes from overheating. In winter, the use of solar heating is able to provide not more than 25 % of the needs regarding the utility and the results of experimental exploitation. It is shown that the main problem of using solar energy in Russia relies not in technology, but in the legislative field. The use of a vacuum manifold in Russia will be widely implemented in areas with a cold climate and in the modern houses after solving the issues of legislative support from the state and municipal authorities.
关键词： hot water,vacuum solar collectors,residential buildings,legislative support,solar energy,heating
更新于2025-09-10 09:29:36
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[IEEE 2018 25th IEEE International Conference on Image Processing (ICIP) - Athens, Greece (2018.10.7-2018.10.10)] 2018 25th IEEE International Conference on Image Processing (ICIP) - Fast Non-Linear Methods for Dynamic Texture Prediction
摘要： This paper aims to develop a fast dynamic-texture prediction method, using tools from non-linear dynamical modeling, and fast approaches for approximate regression. We consider dynamic textures to be described by patch-level non-linear processes, thus requiring tools such as delay-embedding to uncover a phase-space where dynamical evolution can be more easily modeled. After mapping the observed time-series from a dynamic texture video to its recovered phase-space, a time-efficient approximate prediction method is presented which utilizes locality-sensitive hashing approaches to predict possible phase-space vectors, given the current phase-space vector. Our experiments show the favorable performance of the proposed approach, both in terms of prediction fidelity, and computational time. The proposed algorithm is applied to shading prediction in utility scale solar arrays.
关键词： solar energy,shading prediction,dynamic textures,phase-space reconstruction
更新于2025-09-10 09:29:36
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A review on modeling and simulation of solar energy storage systems based on phase change materials
摘要： Phase Change Materials (PCM) have been widely used in different applications. PCM is recognized as one of the most promising materials to store solar thermal energy in the form of latent heat. Utilization of PCMs for solar energy storage compensates for the intermittent characteristic of this energy source. Mathematical modeling and numerical simulation of solar energy storage systems provide useful information for researchers to design and perform experiments with a considerable saving in time and investment. This paper is focused on modeling and simulation of PCM based systems that are used in different solar energy storage applications. A thorough literature review is performed to investigate and compare the results and accuracy of different mathematical models, numerical methods and thermodynamic analysis of using different PCMs in different solar systems. Moreover, the potential research areas in numerical simulations and thermodynamic analysis of solar systems based on PCMs are determined considering the existing gaps in the literature.
关键词： Phase change materials,Solar energy storage systems,Numerical modeling,Simulation
更新于2025-09-10 09:29:36
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Heliostat field cleaning scheduling for Solar Power Tower plants: A heuristic approach
摘要： Soiling of heliostat surfaces due to local climate has a direct impact on their optical efficiency and therefore a direct impact on the productivity of the Solar Power Tower plant. Cleaning techniques applied are dependent on plant construction and current schedules are normally developed considering heliostat layout patterns, providing sub-optimal results. In this paper, a method to optimise cleaning schedules is developed, with the objective of maximising energy generated by the plant. First, an algorithm finds a cleaning schedule by solving an integer program, which is then used as a starting solution in an exchange heuristic. Since the optimisation problems are of large size, a p-median type heuristic is performed to reduce the problem dimensionality by clustering heliostats into groups to be cleaned in the same period.
关键词： Solar energy,Routing problems,Cluster analysis,Scheduling
更新于2025-09-10 09:29:36
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Pt/TiO2 nanotube photocatalyst – Effect of synthesis methods on valance state of Pt and its influence on hydrogen production and dye degradation
摘要： Direct conversion of solar energy into clean fuels is emerging as an efficient way for the future energy generation and solving environmental issues. Especially, photocatalytic splitting of water into H2 under solar light irradiation is one of the best techniques for clean energy production. Also, decomposition of organic pollutants using solar light is an urgent need to protect the environment. Hence, in the present study, we studied Pt-TiO2 nanotubes based composites for H2 generation and methyl orange dye degradation under solar light irradiation and compared the effect of deposition methods namely photo-deposition and chemical reduction methods. We have achieved the highest rate of H2 generation activity compared to other Pt-TiO2 based composite photocatalysts reported previously, and it is ≈ 173. mmol. h-1.g-1 cat for both photo-deposited and chemically reduced Pt/TiO2 nanotubes. This is about 46.8 folds higher than the pristine TiO2 nanotubes at the same experimental conditions. The selected catalysts were tested for degradation of methyl orange dye, where the catalyst prepared by chemical reduction method showed improved activity (94% degradation in 30 min) compared to the one which is prepared by photo-deposition method (50.5% degradation in 30 min). XPS analysis revealed that the photo-deposited catalyst consist only metallic Pt?, while the chemical-reduction yielded Pt with multiple oxidation states, Pt?, Pt2+ and Pt4+.
关键词： dye degradation,photo-deposition,chemical reduction,Solar energy,hydrogen production,photocatalysis
更新于2025-09-10 09:29:36
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[IEEE 2018 Open Innovations (OI) - South Africa (2018.10.3-2018.10.5)] 2018 Open Innovations Conference (OI) - Prospective Use of Thermoelectric Device for PV Panel Cooling
摘要： The electrical efficiency of a photovoltaic panel is influenced by the rise in the panel’s temperature, especially at temperatures from and above 25 °C. For cooling a photovoltaic panel, a thermoelectric module operated as a thermoelectric cooler (TEC) attached at the back of a photovoltaic panel is a practical solution. The TEC module is used to absorb the heat generated on the surface of the photovoltaic panel, which is then dispersed by a heat-sink mounted on the opposite side of a TEC. This paper deals with the development of a mathematical model to optimally control a TEC and take into account the amount of energy used to cool down a photovoltaic panel.
关键词： Photovoltaic cooling,Solar energy,Thermoelectric cooler,Photovoltaic panel
更新于2025-09-10 09:29:36
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Metal Organic Frameworks Based Materials for Heterogeneous Photocatalysis
摘要： The increase in environmental pollution due to the excessive use of fossil fuels has prompted the development of alternative and sustainable energy sources. As an abundant and sustainable energy, solar energy represents the most attractive and promising clean energy source for replacing fossil fuels. Metal organic frameworks (MOFs) are easily constructed and can be tailored towards favorable photocatalytic properties in pollution degradation, organic transformations, CO2 reduction and water splitting. In this review, we ?rst summarize the different roles of MOF materials in the photoredox chemical systems. Then, the typical applications of MOF materials in heterogeneous photocatalysis are discussed in detail. Finally, the challenges and opportunities in this promising ?eld are evaluated.
关键词： solar energy,heterogeneous photocatalysis,metal-organic framework
更新于2025-09-10 09:29:36
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Investigation of CoSO4-based Ag nanofluids as spectral beam splitters for hybrid PV/T applications
摘要： Nano?uid can be used as an e?ective spectral beam splitter to enhance the performance of hybrid PV/T system. In this work, we innovatively developed CoSO4-based Ag nano?uid which might be utilized as ?uid optical ?lter for hybrid PV/T system with silicon concentrator (CPV) solar cell. Firstly, highly dispersed Ag/CoSO4 nano?uids with various concentrations were prepared. The results from the measured optical transmittance of the prepared nano?uids show that Ag/CoSO4 nano?uid has a strong absorption over a broader spectrum than that of water-based one. Subsequently, the e?ect of Ag nano?uids ?lters on the electrical performance of the silicon CPV cell was discussed. Ag/CoSO4 nano?uids produce lower short circuit current and thus lower electrical output than Ag/water nano?uids at the same mass fraction of Ag nanoparticles, whereas they yield higher stagnation temperature than Ag/water nano?uids. A theoretical model for optimizing the optical properties of the nano?uids ?lters and determining merit function (MF) was introduced to evaluate the ?ltering performance of Ag/CoSO4 nano?uids in PV/T systems. The results show that the MF value of PV/T system with Ag/CoSO4-2 nano?uid ?lter is greater than both that with a typical Ag-SiO2 (core-shell)/water nano?uid ?lter and with a Ag/water nano?uid ?lter. And the calculated MF values for PV/T systems with Ag/CoSO4 nano?uid ?lters reach a nearly constant value higher than 1.371 when the mass fraction of Ag nanoparticles contained in the Ag/CoSO4 nano?uid ranging from 24 ppm to 57 ppm. Peak MF value is achieved when the mass fraction of Ag nanoparticles is 37 ppm.
关键词： CoSO4-based,Spectral beam splitter,Solar energy,Silicon concentrator cell,Nano?uid,PV/T
更新于2025-09-10 09:29:36
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[Energy, Environment, and Sustainability] Advances in Solar Energy Research || Experimental Investigation into the Applicability of Nanoparticles in Purification of Sewage Water Through Usage of Solar Energy
摘要： In recent years, solar energy driven water desalination/puri?cation systems have been extensively researched with the objective of improving the distillate yield. In these conventional solar driven systems, solar energy heats the water indirectly i.e. in these systems the solar energy is transferred to the water through conduction, resulting in evaporation and hence puri?cation of the water. The present work explores the idea of adding nanoparticles into the wastewater so that solar energy is transferred to water volumetrically, which considerably improves the evaporation rate. Amorphous carbon nanoparticles have been used owing to their high solar weighted absorptivity values. Careful experiments have been carried out to quantify the effect of nanoparticles on the evaporation rate. It was found that optimum level of nanoparticles addition could actually enhance the evaporation rates of the sewage water by *15%. Furthermore, total dissolved solids (TDS) and pH measurements showed considerable improvements, the values being in the range to qualify for drinkable water.
关键词： Evaporation,Nanoparticles,Condensation,Solar energy,Sewage water
更新于2025-09-10 09:29:36