The Experts below are selected from a list of 20298 Experts worldwide ranked by ideXlab platform
Domenico Laforgia - One of the best experts on this subject based on the ideXlab platform.
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experimental test of an innovative high concentration nanofluid solar Collector
Applied Energy, 2015Co-Authors: Gianpiero Colangelo, Marco Milanese, Ernani Favale, Arturo De Risi, P Miglietta, Domenico LaforgiaAbstract:In this study, a modified flat panel solar Thermal Collector was built and Thermal efficiency was measured with two heat transfer fluids: distillated water and Al2O3–distillated water based nanofluid at high concentration (3.0%) volume fraction of solid phase. In this work for the first time nanofluid with high nanoparticle concentration has been used thanks to a modified solar Thermal Collector, based on patent WO2011138752 A1, which consists in bottom and top headers properly shaped in order to reduce sedimentation of clusters of nanoparticles. Thermal efficiency has been measured through an experimental setup, according to EN 12975-2 standard. Experimental results showed that an increase of Thermal efficiency up to 11.7% compared to that measured with water has been obtained by using nanofluid. Besides effect of nanofluid on Thermal efficiency is greater at high temperatures.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:Abstract The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit. After different nanofluids were tested on the panel prototype, water–Al2O3 was chosen as heat transfer fluid. All tested nanofluids were prepared in batch and their Thermal conductivity and convective heat transfer coefficient were measured prior of their use as heat transfer fluid in the solar panel. A Thermal conductivity enhancement up to 6.7% at a concentration of 3 vol% was observed, while the convective heat transfer coefficient increased up to 25%.
Roland Winston - One of the best experts on this subject based on the ideXlab platform.
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coupled optical Thermal modeling design and experimental testing of a novel medium temperature solar Thermal Collector with pentagon absorber
Solar Energy, 2018Co-Authors: Lun Jiang, Roland Winston, Ali HassanzadehAbstract:Abstract The simulation, prototyping and testing of novel medium-temperature solar Collector is elaborated in this paper. First, selection of higher concentration reflector (1.4×) with optimized absorber geometry (pentagon) is j u s t i f i e d for medium temperature application (100–300 °C). Afterwards, the Collector with 6 evacuated tubes, CPC reflector and manifold is designed and coupled optical-Thermal simulation is studied using finite element method implemented in COMSOL Multiphysics in order to predict optical and Thermal efficiency of the system before prototyping. Finally, the proposed medium-temperature Collector is tested with selective-coated pentagon absorber in the real condition at University of California, Advanced solar technology institute. The experimental and numerical results underscore a close similarity which the optical efficiency of 64% and Thermal efficiency of 50% at 200 °C are achieved both numerically and experimentally. At the end, the proposed Collector is compared with all major commercial Collector both in performance and cost. The levelized cost of heat for a single Collector is calculated as 3.1 cents/kWh. This price is cheaper than all categories of solar Collector (Evacuated flat plat, Evacuated Tube, Fresnel lenses and parabolic trough) for medium temperature application (200 °C). Also, LCOH of proposed Collector indicates the potential for solar Thermal Collector to challenge natural gas as California’s primary heat source in the near future.
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non tracking east west xcpc solar Thermal Collector for 200 celsius applications
Applied Energy, 2018Co-Authors: Lun Jiang, Roland Winston, Bennett Widyolar, Jonathan FerryAbstract:Abstract The design and development of a commercial-ready medium-temperature solar Thermal Collector, the external compound parabolic concentrator (XCPC), is presented in which a nonimaging reflector is paired with an evacuated tube absorber for efficient and low-cost heat collection between 100 and 250 °C. The absorber geometry is optimized under the constraint of being assembled with an ultrasonic welding machine, with a final pentagon-shaped absorber selected. The modified absorber shape, gap loss, and truncated reflector result in a geometric efficiency of 93% compared to an ideal CPC. The final prototype has a 4.56 m2 aperture and simulations predict an optical efficiency of 71% and Thermal efficiency of 50% at 200 °C. Experimental test results (optical, Thermal, stagnation) have confirmed an optical efficiency of 62% and a Thermal efficiency near 50% at 200 °C with a final stagnation temperature of 333 °C. A detailed economic analysis reveals the technology can be installed for $0.58/watt and deliver a levelized cost of heat at 3.01 cents per kWh over a 20 year lifetime. This is equivalent to the current cost of natural gas in the United States, which underscores the potential of this technology to assist in decarbonizing the Thermal energy sector.
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efficient stationary solar Thermal Collector systems operating at a medium temperature range
Applied Energy, 2013Co-Authors: Kevin Balkoski, Lun Jiang, Roland WinstonAbstract:In this paper, a stationary solar Thermal Collector system using an evacuated glass and a counter-flow tube for medium is modeled, analyzed, fabricated, and tested. The proposed non-tracking system consists of an evacuated counter-flow type absorber paired with an external compound parabolic concentrators (XCPC) as a non-imaging reflector. This configuration allows the system to operate with a high solar Thermal efficiency for medium working temperature (100–300°C). Efficiencies for both East–West and North–South orientations are modeled and measured at various working temperatures. Simulation and experimental test results show that the proposed configuration outperforms other non-tracking solar Thermal systems and can achieve more than 40% efficiency above 200°C.
Gianpiero Colangelo - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation of Thermal efficiency of an innovative Al2O3 nanofluid solar Thermal Collector: Influence of nanoparticles concentration
Thermal Science, 2017Co-Authors: Gianpiero Colangelo, Marco MilaneseAbstract:Investigations on the potential Thermal efficiency of an innovative nanofluid solar Thermal Collector have been performed using a commercial software (RadTherm ThermoAnalytics rel. 10.5). The Al2O3-nanofluid has been simulated as working fluid of the solar Thermal Collector, varying the nanoparticles concentration from 0%vol of Al2O3 nanoparticles (pure water) up to 3%vol of Al2O3 of nanoparticles. The numerical model has been validated with experimental data, obtained with a real prototype of the simulated solar Thermal Collector. Real Thermal properties of the nanofluids at different concentrations have been used in the simulations. The boundary conditions used for the simulations have been those of real weather conditions. An increase in Thermal efficiency (up to 7.54%) has been calculated using nanofluid with a volume fraction of 3% and the influence of nanoparticles concentration on the Thermal performance of the solar Collector has been pointed out.
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experimental test of an innovative high concentration nanofluid solar Collector
Applied Energy, 2015Co-Authors: Gianpiero Colangelo, Marco Milanese, Ernani Favale, Arturo De Risi, P Miglietta, Domenico LaforgiaAbstract:In this study, a modified flat panel solar Thermal Collector was built and Thermal efficiency was measured with two heat transfer fluids: distillated water and Al2O3–distillated water based nanofluid at high concentration (3.0%) volume fraction of solid phase. In this work for the first time nanofluid with high nanoparticle concentration has been used thanks to a modified solar Thermal Collector, based on patent WO2011138752 A1, which consists in bottom and top headers properly shaped in order to reduce sedimentation of clusters of nanoparticles. Thermal efficiency has been measured through an experimental setup, according to EN 12975-2 standard. Experimental results showed that an increase of Thermal efficiency up to 11.7% compared to that measured with water has been obtained by using nanofluid. Besides effect of nanofluid on Thermal efficiency is greater at high temperatures.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:Abstract The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit. After different nanofluids were tested on the panel prototype, water–Al2O3 was chosen as heat transfer fluid. All tested nanofluids were prepared in batch and their Thermal conductivity and convective heat transfer coefficient were measured prior of their use as heat transfer fluid in the solar panel. A Thermal conductivity enhancement up to 6.7% at a concentration of 3 vol% was observed, while the convective heat transfer coefficient increased up to 25%.
Valerio Lo Brano - One of the best experts on this subject based on the ideXlab platform.
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life cycle assessment of a solar Thermal Collector
Renewable Energy, 2005Co-Authors: Fulvio Ardente, Giorgio Beccali, Maurizio Cellura, Valerio Lo BranoAbstract:Abstract The renewable energy sources are often presented as ‘clean’ sources, not considering the environmental impacts related to their manufacture. The production of the renewable plants, like every production process, entails a consumption of energy and raw materials as well as the release of pollutants. Furthermore, the impacts related to some life cycle phases (as maintenance or installation) are sometimes neglected or not adequately investigated. The energy and the environmental performances of one of the most common renewable technologies have been studied: the solar Thermal Collector for sanitary warm water demand. A life cycle assessment (LCA) has been performed following the international standards of series ISO 14040. The aim is to trace the product's eco-profile that synthesises the main energy and environmental impacts related to the whole product's life cycle. The following phases have been investigated: production and deliver of energy and raw materials, production process, installation, maintenance, disposal and transports occurring during each step. The analysis is carried out on the basis of data directly collected in an Italian factory.
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life cycle assessment of a solar Thermal Collector
Renewable Energy, 2005Co-Authors: Fulvio Ardente, Giorgio Beccali, Maurizio Cellura, Valerio Lo BranoAbstract:The renewable energy sources are often presented as ‘clean’ sources, not considering the environmental impacts related to their manufacture. The production of the renewable plants, like every production process, entails a consumption of energy and raw materials as well as the release of pollutants. Furthermore, the impacts related to some life cycle phases (as maintenance or installation) are sometimes neglected or not adequately investigated.
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life cycle assessment of a solar Thermal Collector sensitivity analysis energy and environmental balances
Renewable Energy, 2005Co-Authors: Fulvio Ardente, Giorgio Beccali, Maurizio Cellura, Valerio Lo BranoAbstract:Starting from the results of a life cycle assessment of solar Thermal Collector for sanitary warm water, an energy balance between the employed energy during the Collector life cycle and the energy saved thanks to the Collector use has been investigated. A sensitivity analysis for estimating the effects of the chosen methods and data on the outcome of the study was carried out. Uncertainties due to the eco-profile of input materials and the initial assumptions have been analysed.
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life cycle assessment of a solar Thermal Collector sensitivity analysis energy and environmental balances
Renewable Energy, 2005Co-Authors: Fulvio Ardente, Giorgio Beccali, Maurizio Cellura, Valerio Lo BranoAbstract:Abstract Starting from the results of a life cycle assessment of solar Thermal Collector for sanitary warm water, an energy balance between the employed energy during the Collector life cycle and the energy saved thanks to the Collector use has been investigated. A sensitivity analysis for estimating the effects of the chosen methods and data on the outcome of the study was carried out. Uncertainties due to the eco-profile of input materials and the initial assumptions have been analysed. Since the study is concerned with a renewable energy system, attention has been focused on the energy indexes and in particular the “global energy consumption”. Following the principles of Kyoto Protocol, the variations of CO 2 emissions have also been studied.
Ernani Favale - One of the best experts on this subject based on the ideXlab platform.
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experimental test of an innovative high concentration nanofluid solar Collector
Applied Energy, 2015Co-Authors: Gianpiero Colangelo, Marco Milanese, Ernani Favale, Arturo De Risi, P Miglietta, Domenico LaforgiaAbstract:In this study, a modified flat panel solar Thermal Collector was built and Thermal efficiency was measured with two heat transfer fluids: distillated water and Al2O3–distillated water based nanofluid at high concentration (3.0%) volume fraction of solid phase. In this work for the first time nanofluid with high nanoparticle concentration has been used thanks to a modified solar Thermal Collector, based on patent WO2011138752 A1, which consists in bottom and top headers properly shaped in order to reduce sedimentation of clusters of nanoparticles. Thermal efficiency has been measured through an experimental setup, according to EN 12975-2 standard. Experimental results showed that an increase of Thermal efficiency up to 11.7% compared to that measured with water has been obtained by using nanofluid. Besides effect of nanofluid on Thermal efficiency is greater at high temperatures.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit.
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a new solution for reduced sedimentation flat panel solar Thermal Collector using nanofluids
Applied Energy, 2013Co-Authors: Gianpiero Colangelo, Ernani Favale, Arturo De Risi, Domenico LaforgiaAbstract:Abstract The present paper reports the experimental results and the potential performance of the investigation on flat solar Thermal Collectors using nanofluids as innovative heat transfer fluids for solar energy applications. The straight use of heat-transfer nanofluids in traditional solar flat panel revealed some technical issues, due to the nanoparticles sedimentation. Therefore, sedimentation has been investigated both in standard solar flat panels and modified ones made from transparent tubes. The results of the first tests showed that the main sedimentation parameter is the flow velocity and to better control it a standard flat panel was modified changing the cross-section of the lower and top header of the panel, that have been tapered to keep constant the fluid axial velocity. The modification of the panel shape (patent pending) enabled a negligible particles deposit. After different nanofluids were tested on the panel prototype, water–Al2O3 was chosen as heat transfer fluid. All tested nanofluids were prepared in batch and their Thermal conductivity and convective heat transfer coefficient were measured prior of their use as heat transfer fluid in the solar panel. A Thermal conductivity enhancement up to 6.7% at a concentration of 3 vol% was observed, while the convective heat transfer coefficient increased up to 25%.
