The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
M.a. Sharafeldin - One of the best experts on this subject based on the ideXlab platform.
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Evacuated tube solar Collector Performance using copper nanofluid: Energy and environmental analysis
Applied Thermal Engineering, 2019Co-Authors: M.a. Sharafeldin, Gyula Gróf, Eiyad Abu-nada, Omid MahianAbstract:Abstract The effect of metallic copper nanoparticles on the thermal efficiency of an evacuated tube solar Collector was studied. Different volume concentrations of copper nanoparticles e.i. 0.01%, 0.02% and 0.03% were examined to explore the effect of nanoparticles on evacuated solar Collector Performance. The tests were performed at three volume flow rates of 0.6 L/min, 0.7 L/min and 0.8 L/min. The results demonstrate a 50% increase in the output temperature. Also, the heat energy incremented from 417 W to 667 W, which is equivalent to 34% area reduction for the same energy production. The remarkable enhancement in the heat removal factor to reach a value of 0.97. Copper nanoparticles played a significant role to increase both the absorbed energy and the removal energy parameters. Their maximum values were found for a volume concentration of 0.03% and at the volume flow rate of 0.8 L/min to be 0.83 and 21.66, respectively. Finally, environmental analysis is carried out to find the role of copper nanoparticles in CO2 reduction. The comparison between current results with reported results in the literature for other types of nanoparticles, show the high potential of copper nanoparticles for solar Collector applications.
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evacuated tube solar Collector Performance using ceo2 water nanofluid
Journal of Cleaner Production, 2018Co-Authors: M.a. Sharafeldin, Gyula GrófAbstract:Abstract Nanofluids are the most attractive mean to enhance the Performance of heat transfer devices. Several types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes use of these nanofluids special in solar Collectors. Evacuated tube solar Collector is one of the most utilized solar Collectors in thermal applications. CeO2 nanoparticles were used in the presented study. The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using Zeta potential machine. Experiments were carried out using three different volume concentration of CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal Performance of the evacuated tube solar Collector was examined at different mass flux rates. Results showed that the temperature difference between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable factor, the thermo-optical characteristic of the Collector, and the thermal loss coefficient. The thermo-optical characteristic of the Collector of tube solar corrector is raised up to 34%.
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Evacuated tube solar Collector Performance using CeO2/water nanofluid
Journal of Cleaner Production, 2018Co-Authors: M.a. Sharafeldin, Gyula GrófAbstract:Abstract Nanofluids are the most attractive mean to enhance the Performance of heat transfer devices. Several types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes use of these nanofluids special in solar Collectors. Evacuated tube solar Collector is one of the most utilized solar Collectors in thermal applications. CeO2 nanoparticles were used in the presented study. The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using Zeta potential machine. Experiments were carried out using three different volume concentration of CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal Performance of the evacuated tube solar Collector was examined at different mass flux rates. Results showed that the temperature difference between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable factor, the thermo-optical characteristic of the Collector, and the thermal loss coefficient. The thermo-optical characteristic of the Collector of tube solar corrector is raised up to 34%.
Gyula Gróf - One of the best experts on this subject based on the ideXlab platform.
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Evacuated tube solar Collector Performance using copper nanofluid: Energy and environmental analysis
Applied Thermal Engineering, 2019Co-Authors: M.a. Sharafeldin, Gyula Gróf, Eiyad Abu-nada, Omid MahianAbstract:Abstract The effect of metallic copper nanoparticles on the thermal efficiency of an evacuated tube solar Collector was studied. Different volume concentrations of copper nanoparticles e.i. 0.01%, 0.02% and 0.03% were examined to explore the effect of nanoparticles on evacuated solar Collector Performance. The tests were performed at three volume flow rates of 0.6 L/min, 0.7 L/min and 0.8 L/min. The results demonstrate a 50% increase in the output temperature. Also, the heat energy incremented from 417 W to 667 W, which is equivalent to 34% area reduction for the same energy production. The remarkable enhancement in the heat removal factor to reach a value of 0.97. Copper nanoparticles played a significant role to increase both the absorbed energy and the removal energy parameters. Their maximum values were found for a volume concentration of 0.03% and at the volume flow rate of 0.8 L/min to be 0.83 and 21.66, respectively. Finally, environmental analysis is carried out to find the role of copper nanoparticles in CO2 reduction. The comparison between current results with reported results in the literature for other types of nanoparticles, show the high potential of copper nanoparticles for solar Collector applications.
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evacuated tube solar Collector Performance using ceo2 water nanofluid
Journal of Cleaner Production, 2018Co-Authors: M.a. Sharafeldin, Gyula GrófAbstract:Abstract Nanofluids are the most attractive mean to enhance the Performance of heat transfer devices. Several types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes use of these nanofluids special in solar Collectors. Evacuated tube solar Collector is one of the most utilized solar Collectors in thermal applications. CeO2 nanoparticles were used in the presented study. The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using Zeta potential machine. Experiments were carried out using three different volume concentration of CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal Performance of the evacuated tube solar Collector was examined at different mass flux rates. Results showed that the temperature difference between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable factor, the thermo-optical characteristic of the Collector, and the thermal loss coefficient. The thermo-optical characteristic of the Collector of tube solar corrector is raised up to 34%.
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Evacuated tube solar Collector Performance using CeO2/water nanofluid
Journal of Cleaner Production, 2018Co-Authors: M.a. Sharafeldin, Gyula GrófAbstract:Abstract Nanofluids are the most attractive mean to enhance the Performance of heat transfer devices. Several types of nanoparticles were utilized as they have high thermal conductivity. Renewable energy makes use of these nanofluids special in solar Collectors. Evacuated tube solar Collector is one of the most utilized solar Collectors in thermal applications. CeO2 nanoparticles were used in the presented study. The mean diameter of CeO2 was 25 nm. A stable CeO2/water was made. The stability was checked using Zeta potential machine. Experiments were carried out using three different volume concentration of CeO2 nanoparticles of 0.015%, 0.025%, and 0.035%. The thermal Performance of the evacuated tube solar Collector was examined at different mass flux rates. Results showed that the temperature difference between inlet and outlet flow and absorbed energy increase when nanofluids are used. The volume fraction flow rate of 0.035% at the mass flux rate of 0.017 kg/s.m2 had the maximum heat removable factor, the thermo-optical characteristic of the Collector, and the thermal loss coefficient. The thermo-optical characteristic of the Collector of tube solar corrector is raised up to 34%.
Nasa - One of the best experts on this subject based on the ideXlab platform.
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Standardized Performance tests of Collectors of solar thermal energy: Prototype moderately concentrating grooved Collectors
2013Co-Authors: NasaAbstract:Prototypes of moderately concentrating grooved Collectors were tested with a solar simulator for varying inlet temperature, flux level, and incident angle. Collector Performance is correlated in terms of inlet temperature and flux level.
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Collector Performance after weathering
2011Co-Authors: NasaAbstract:Method drastically reduces preparation time of pentaerythritol diformal (2, 4, 8, 10-tetroxaspiro (5.5) undecane) from several hours to time span of 3 to 20 minutes with yields greater than 90 percent. Other advantages include elimination of solvents, decrease in labor and energy needs, adaptability to continuous operations, and overall simplicity and convenience.
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Liquid solar Collector-Performance tests
2011Co-Authors: NasaAbstract:Report describes comprehensive Performances test on commercially-available modular nonmetallic single-glazed liquid solar Collector to verify compliance with U. S. Housing and Urban Development Department standards for thermal stability. Program includes tests of initial thermal Performance, 30 day stagnation, and final external Performance.
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Concentrating solar Collector-Performance tests
2011Co-Authors: NasaAbstract:Report summarizes test results from evaluation of concentrating solar Collector thermal Performance, from transient behavior, and incident-of-angle behavior. Tests were conducted using National Bureau of Standards recommedations and specifications.
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Liquid solar Collector-Performance evaluation
2011Co-Authors: NasaAbstract:Report summarizes thermal Performance tests and measurements of incident-of-angle modified and transient response of flat-plate solar Collector.
Moussa Zerrouki - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of solar parabolic trough Collector Performance in the algeria saharan region
Energy Conversion and Management, 2014Co-Authors: Yacine Marif, Hocine Benmoussa, Hamza Bouguettaia, Mohamed Mustapha Belhadj, Moussa ZerroukiAbstract:Abstract In order to determine the optical and thermal Performance of a solar parabolic trough Collector under the climate conditions of Algerian Sahara, a computer program based on one dimensional implicit finite difference method with energy balance approach has been developed. The absorber pipe, glass envelope and fluid were divided into several segments and the partial derivation in the differential equations was replaced by the backward finite difference terms in each segment. Two fluids were considered, liquid water and TherminolVP-1™ synthetic oil. Furthermore, the intensity of the direct solar radiation was estimated by monthly average values of the atmospheric Linke turbidity factor for different tracking systems. According to the simulation findings, the one axis polar East–West and horizontal East–West tracking systems were most desirable for a parabolic trough Collector throughout the whole year. In addition, it is found that the thermal efficiency was about 69.73–72.24%, which decreases with the high synthetic oil fluid temperatures and increases in the lower water temperature by 2%.
Soteris A. Kalogirou - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of a parabolic trough Collector Performance
2020Co-Authors: Soteris A. Kalogirou, Gregoris PanayiotouAbstract:In this paper the Collector erected at the Archimedes Solar Energy Laboratory is initially presented followed by the Performance evaluation of the Collector. The Collector is made by Nep Solar from Australia. It has an aperture area of 14.4 m, a concentration ratio of 13.7 and can be operated up to 200°C. The Collector aperture is 1208 mm and the receiver pipe is stainless steel 304 L with a diameter of 28mm, coated with selective coating having an absorptance of 0.93 and an emitance of 0.18. The Collector is orientated with its axis in the East-West direction. The advantages of this tracking mode are that very little Collector adjustment is required during the day and the full aperture always faces the sun at noon. A dedicated computer-operated tracking system is responsible for keeping the Collector focused at all times. The Collector is connected to a hot water storage tank which has a capacity of 300 liters. The Collector fluid used in the tests is water, which is pressurized to avoid boiling in the receiver. The Performance obtained is very satisfactory and agrees with the Performance curve given by the manufacturer.
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prediction of flat plate Collector Performance parameters using artificial neural networks
Solar Energy, 2006Co-Authors: Soteris A. KalogirouAbstract:The objective of this work is to use Artificial Neural Networks (ANN) for the prediction of the Performance parameters of flat-plate solar Collectors. ANNs have been used in diverse applications and they have been shown to be particularly useful in system modeling and system identification. Six ANN models have been developed for the prediction of the standard Performance Collector equation coefficients, both at wind and no-wind conditions, the incidence angle modifier coefficients at longitudinal and transverse directions, the Collector time constant, the Collector stagnation temperature and the Collector heat capacity. Different networks were used due to the different nature of the input and output required in each case. The data used for the training, testing and validation of the networks were obtained from the LTS database. The results obtained when unknown data were presented to the networks are very satisfactory and indicate that the proposed method can successfully be used for the prediction of the Performance parameters of flat-plate solar Collectors. The advantages of this approach compared to the conventional testing methods are speed, simplicity, and the capacity of the network to learn from examples. This is done by embedding experiential knowledge in the network.