Bibliographies thématiques / Concentratori parabolici lineari

Littérature scientifique sur le sujet « Concentratori parabolici lineari »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Concentratori parabolici lineari"

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Pardellas, Alberto, Pedro Fortuny Ayuso, Luis Bayón et Arsenio Barbón. « A New Two-Foci V-Trough Concentrator for Small-Scale Linear Fresnel Reflectors ». Energies 16, no 4 (5 février 2023) : 1597. http://dx.doi.org/10.3390/en16041597.

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We present the design of an original secondary cavity for use in Small-Scale Fresnel Reflectors in photovoltaic applications. The cavity is similar to the classical V-trough, but the primary reflector system is configured so that there are two focal points on the aperture. The rays coming from each side of the primary system reach the opposite side of the cavity, producing a non-symmetrical distribution of the irradiance. This modifies the acceptance half-angle and allows us to break the maximum limit for the concentration ratio of ideal symmetric concentrators. Our study is analytic, and we provide formulas for any number of reflections. Numerical simulations with a ray-tracing program based on MATLAB are included. We provide a comparison of optical concentration ratio, height and cost parameter between our system and two classical designs with a single focal point: the V-trough and the Compound Parabolic concentrators. This way, we verify that our design yields better concentration ratios while keeping the ray acceptance rate at one. Our solution proves to be better than both the classical one-focus V-trough and the Compound Parabolic concentrator. Specifically, the proposed solution is significantly better than the classical one-focus V-trough in optical concentration ratio, with an increase between 15.02 and 35.95%. As regards the compound parabolic concentrator, the optical concentration ratio is always slightly better (around 4%). The height of the cavity, however, is notably less in this design (around 54.33%).
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Ghodbane, Mokhtar, Djamel Benmenine, Abderrahmane Khechekhouche et Boussad Boumeddane. « Brief on Solar Concentrators : Differences and Applications ». Instrumentation Mesure Métrologie 19, no 5 (15 novembre 2020) : 371–78. http://dx.doi.org/10.18280/i2m.190507.

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In light of the global crises that the world suffers from, the renewable energy exploitation is a viable solution to remedy the various energy crises, knowing that renewable energy is a source of environmental credibility, as it does not cause any pollution or any emissions harmful to the environment. Among the most important renewable energy sources, solar energy is the most important type as it can be exploited thermally by adopting various solar collectors, especially solar concentrators. This paper has been devoted to illustrate the types of solar concentrators, namely point-focus concentrators (Heliostat Field Collectors and Parabolic Dish Collectors) and linear concentrators (Linear Fresnel Reflectors and Parabolic Trough Collectors), in an attempt to clarify its principle and its multiple uses domestically and industrially, especially in areas that are characterized by the abundance of its direct solar radiation. The solar concentrator is a solar thermal energy concentration system, because its use reduces the consumption of fossil fuels harmful to the environment and directly contributes to climate change. Solar thermal concentrators are an effective alternative to fossil generators for thermal energy, as they have many important uses such as the solar electricity production of solar electricity in power plants, industrial and domestic water heating, and have many other industrial uses.
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Kant, Karunesh, Karthik Nithyanandam et Ranga Pitchumani. « Analysis and Optimization of a Novel Hexagonal Waveguide Concentrator for Solar Thermal Applications ». Energies 14, no 8 (12 avril 2021) : 2146. http://dx.doi.org/10.3390/en14082146.

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This paper analyzes a novel, cost-effective planar waveguide solar concentrator design that is inspired by cellular hexagonal structures in nature with the benefits of facile installation and low operation and maintenance cost. A coupled thermal and optical analysis of solar irradiation through an ideal hexagonal waveguide concentrator integrated with a linear receiver is presented, along with a cost analysis methodology, to establish the upper limit of performance. The techno-economic model, coupled with numerical optimization, is used to determine designs that maximized power density and minimized the cost of heat in the temperature range of 100–250 °C, which constitutes more than half of the industrial process heat demand. Depending on the incident solar irradiation and the application temperature, the cost of heat for the optimal design configuration ranged between 0.1–0.27 $/W and 0.075–0.18 $/W for waveguide made of ZK7 glass and polycarbonate, respectively. A techno-economic analysis showed the potential of the technology to achieve cost as low as 80 $/m2 and 61 $/m2 for waveguide made of ZK7 glass and polycarbonate material, respectively, which is less than half the cost of state-of-the-art parabolic trough concentrators. Overall, the hexagonal waveguide solar concentrator technology shows immense potential for decarbonizing the industrial process heat and thermal desalination sectors.
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Feuermann, D., et J. M. Gordon. « Analysis of a Two-Stage Linear Fresnel Reflector Solar Concentrator ». Journal of Solar Energy Engineering 113, no 4 (1 novembre 1991) : 272–79. http://dx.doi.org/10.1115/1.2929973.

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The two-stage linear Fresnel reflector solar concentrator is analyzed via an in-depth study of an installed, nominally 220 KWt system. The concentrator includes: (1) a primary linear Fresnel reflector comprised of curved mirrors and (2) a secondary nonimaging CPC-type trough with a tubular receiver. The principal practical design options for the secondary concentrator are evaluated. Via a computer simulation which includes ray-tracing of the primary reflector, we evaluate the sensitivity of energy output to: concentrator optical errors, system geometry, tracking mode, and the option of using flat versus curved primary mirrors. The two-stage Fresnel concentrator can be considerably less expensive than the corresponding parabolic trough collector, but is found to deliver about one-fourth less yearly energy. However, much of this difference could be eliminated through the use of higher-quality CPC reflectors.
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Li, Guihua, Jingjing Tang et Runsheng Tang. « A note on design of linear dielectric compound parabolic concentrators ». Solar Energy 171 (septembre 2018) : 500–507. http://dx.doi.org/10.1016/j.solener.2018.06.065.

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Rönnelid, Mats, et Björn Karlsson. « Optical acceptance function of modified compound parabolic concentrators with linear corrugated reflectors ». Applied Optics 37, no 22 (1 août 1998) : 5222. http://dx.doi.org/10.1364/ao.37.005222.

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Rafiei, Alireza, Reyhaneh Loni, Mohammad Hossein Ahmadi, Gholamhassan Najafi, Evangelos Bellos, Fatemeh Rajaee et Ezzatollah Askari Asli‐Ardeh. « Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity ». Energy Science & ; Engineering 8, no 10 (17 juin 2020) : 3544–60. http://dx.doi.org/10.1002/ese3.763.

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Chen, F., M. Li, P. Zhang et X. Luo. « Thermal performance of a novel linear cavity absorber for parabolic trough solar concentrator ». Energy Conversion and Management 90 (janvier 2015) : 292–99. http://dx.doi.org/10.1016/j.enconman.2014.11.034.

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Ismail, Benlaria, Belhadj Mohammed, Othmane Abdelkhalek et Sabouni Elhadj. « An experimental study of PV/T system using parabolic reflectors and heat exchanger ». Indonesian Journal of Electrical Engineering and Computer Science 24, no 3 (1 décembre 2021) : 1297. http://dx.doi.org/10.11591/ijeecs.v24.i3.pp1297-1306.

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<p>Photovoltaic (PV) systems can be made more efficient by forcing the PV panel to operate at its maximum point power due to the electrical properties of photovoltaic generators, which are substantially non-linear (MPP). This study examines the effectiveness of using a combination of parabolic concentrator Bi-reflector and heat exchanger as a cooling system on the performance of photovoltaic generators to get a photovoltaic/thermal (PV/T) system, and their effect on the direct current (DCDC) converter using matrix laboratory (MATLAB) simulink. The experimental tests were carried out under various temperature values and sun irradiation. The results demonstrated that the use of parabolic Bi-reflectors, to further illumine te the panels, and the use of the cooling system to absorb excess heat to get heat water, could increase and enhances performances of the photovoltaic generator.</p>
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Jin, Hongguang, Jun Sui, Hui Hong, Zhifeng Wang, Danxing Zheng et Zhi Hou. « Prototype of Middle-Temperature Solar Receiver/Reactor With Parabolic Trough Concentrator ». Journal of Solar Energy Engineering 129, no 4 (6 juin 2007) : 378–81. http://dx.doi.org/10.1115/1.2769698.

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This paper manufactured an original middle-temperature solar receiver/reactor prototype, positioned along the focal line of one-axis parabolic trough concentrator, representing the development of a new kind of solar thermochemical technology. A 5kW prototype solar reactor at around 200–300°C, which is combined with a linear receiver, was originally manufactured. A basic principle of the design of the middle-temperature solar reactor is identified and described. A representative experiment of solar-driven methanol decomposition was carried out. Experimental tests were conducted from 200°C to 300°C under mean solar flux of 300–800W∕m2 and at a given methanol feeding rate of 2.1L∕h. The conversion of methanol decomposition yielded up to 50–95%, and the efficiency of solar thermal energy conversion to chemical energy reached 30–60%. The experimental results obtained here prove that the novel solar receiver/reactor prototype introduced in this paper can provide a promising approach to effectively utilize middle-temperature solar thermal energy by means of solar thermochemical processes.
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Thèses sur le sujet "Concentratori parabolici lineari"

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MESSERI, MATTEO. « PROGETTAZIONE MECCANICA DI SISTEMI SOLARI A CONCENTRAZIONE ». Doctoral thesis, 2012. http://hdl.handle.net/2158/864894.

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Il primo aspetto considerato è stato il calcolo delle azioni del vento su profili parabolici; a tale scopo è stato messo a punto, tramite l’utilizzo della CFD, uno strumento per il calcolo del campo di pressione agente sui collettori. Inoltre è stato sviluppata la meccanica di un inseguitore biassiale innovativo, caratterizzato da un’elevata precisione di puntamento, la possibilità di un tracking continuo e facilità di montaggio. Infine è stato progettato un profilometro ad hoc, utilizzabile anche all’esterno, per il controllo dimensionale panelli riflettenti autoportanti parabolici.
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Actes de conférences sur le sujet "Concentratori parabolici lineari"

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Ahmed, Mohamed H., Mohamed Rady, Amr M. A. Amin, Fabio Maria Montagnino et Filippo Paredes. « Comparison of thermal and optical performance of Linear Fresnel and Parabolic Trough Concentrator ». Dans 2015 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2015. http://dx.doi.org/10.1109/icrera.2015.7418488.

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Lai, Yanhua, Gu Song, Mingxin Lu, Zhen Dong, Shuping Che et Chunyuan Ma. « Thermal performance analysis of linear fresnel reflector concentrator with a compound parabolic cavity absorber ». Dans Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930788.

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Chapman, Daniel J., et Diego A. Arias. « Effect of Solar Brightness Profiles on the Performance of Parabolic Concentrating Collectors ». Dans ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90099.

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Solar brightness profiles were used to model the optical performance of a parabolic linear solar concentrator. A sensitivity analysis of the sun size on collector performance was completed using analytical methods. Ray traces were created for solar brightness profiles having circumsolar ratios from 0–40%, slope errors of the optical surface from 2–5 mrads, and angles of incidence varying from 0–60 degrees. Using typical meteorological data for two locations, the optical performance was calculated and averaged over a year. Intercept factors of these simulations were compared to simpler analytical models that cast the sun shape as a Gaussian function. Results showed that collector performance is relatively insensitive to solar profile, and that using a representative Gaussian solar profile will tend to underestimate collector performance compared to using exact weighted solar profiles by about 1%. This difference is within the uncertainty propagation of the intercept factor calculated with analytical methods.
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Shukla, S. K., et S. K. Gupta. « Performance Evaluation of Concentrating Solar Cooker Under Indian Climatic Conditions ». Dans ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54030.

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The work presented in this paper essentially consists of modeling and analysis of energy and exergy efficiency of a community solar cooker, installed at Holistic Health and Food Centre, I.I.T. Delhi India in March 1998. The cooker is meant for community cooking, which consists of a linear parabolic concentrator with concentration ratio of 20. The experiments, on this cooker, were performed in summer and winter, both the climatic conditions. The measurements were done by using microprocessor based on line data acquisition system using class I solar pyranometer and Pt. 100 temperature sensors. Based on the experimental data obtained by testing and performance evaluation of this concentrating type of solar cooker, the energy and exergy efficiencies are calculated. From an analysis of the experimental values the average efficiency of this cooker is measured as 14% only. The different losses contributes to low efficiency are optical losses (16%), geometrical losses (30%) and thermal losses (35%) accounts for more than, 80% energy waste from the radiation coming to the reflector. The rest of the losses are due to edge losses etc. the maximum temperature of water was recorded 98°C during water heating tests.
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Arroyo, A., M. McLorn, M. Fabian, M. White et A. I. Sayma. « Rotor-Dynamics of Different Shaft Configurations for a 6 kW Micro Gas Turbine for Concentrated Solar Power ». Dans ASME Turbo Expo 2016 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56479.

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Rotor-dynamics of Micro Gas Turbines (MGTs) under 30 kW have been a critical issue for the successful development of reliable engines during the last decades. Especially, no consensus has been reached on a reliable MGT arrangement under 10 kW with rotational speeds above 100,000 rpm, making the understanding of the rotor-dynamics of these high speed systems an important research area. This paper presents a linear rotor-dynamic analysis and comparison of three mechanical arrangements of a 6 kW MGT intended for utilising Concentrated Solar Power (CSP) using a parabolic dish concentrator. This application differs from the usual fuel burning MGT in that it is required to operate at a wider operating speed range. The objective is to find an arrangement that allows reliable mechanical operation through better understanding of the rotor dynamics for a number of alternative shaft-bearings arrangements. Finite Element Analysis (FEA) was used to produce Campbell diagrams and to determine the critical speeds and mode shapes. Experimental hammer tests using a new approach based on optical sensing technology were used to validate the rotor-dynamic models. The FEA simulation results for the natural frequencies of a shaft arrangement were within 5% of the measurements, while the deviation for the shaft-bearings arrangement increased up to 16%.
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Montero, Andrés, Jesús López-Villada, Carlos Naranjo-Mendoza et Jerko Labus. « Comparative Study of Solar Assisted Cooling Technologies for Two Different Climates ». Dans ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6687.

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This study describes the influence of climate conditions and different solar assisted absorption technologies on the energy performance of air-conditioning systems. The correlation between dynamic cooling load profile and the performance of various solar assisted absorption system configurations was analyzed for two different climates: a hot-summer Mediterranean climate (Seville, Spain) and a tropical savannah climate (Guayaquil, Ecuador). A generic two-story office building was selected as a case study. The building fabrics are set to comply with the best practices of the two countries and the building counts with a useful area of 1152 m2 for the solar system installation. The hourly cooling demand for the building was calculated by using a simplified calculation method based on degree-days with variable base temperature. Three different solar assisted absorption configurations were simulated in TRNSYS software environment based on three types of solar collectors: evacuated tube collectors, parabolic trough collectors and linear Fresnel collectors (micro-concentrator type). The first configuration which involves evacuated tube collectors was coupled to a single-effect H2O-LiBr absorption chiller, while the other two configurations include double-effect H2O-LiBr absorption chiller. Models of two different absorption chillers were developed based on the characteristic equation method (ΔΔt). The comparison between the configurations was based on the primary energy analysis and CO2 emission.
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