The Experts below are selected from a list of 3774 Experts worldwide ranked by ideXlab platform
Guangdong Zhu - One of the best experts on this subject based on the ideXlab platform.
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sensitivity analysis on optical performance of a novel Linear Fresnel concentrating solar power collector
Solar Energy, 2019Co-Authors: Nicholas Kincaid, Nick Kramer, Greg Mungas, Guangdong ZhuAbstract:Abstract A novel, low-cost Linear Fresnel collector for concentrating solar power applications is being developed by Hyperlight Energy (Hyperlight) and the National Renewable Energy Laboratory (NREL). Hyperlight is currently deploying their Linear Fresnel collector technology in a half-acre pilot loop near Brawley, California. The optical performance of a concentrating solar power collector represents the largest loss in the efficiency of the overall system. The ability to accurately model the complex optical interactions of a collector becomes essential in successfully implementing a new collector technology. This study presents a detailed sensitivity analysis of the optical performance of Hyperlight Linear Fresnel technology, characterizing the effects of potential optomechanical error sources on collector performance. Optical models are implemented in SolTrace, a Monte-Carlo ray-tracing software developed at NREL. First, SolTrace is used to analyze collector sensitivity to individual optomechanical error perturbations in both the primary reflectors and the receiver assembly. Then, a high-fidelity optomechanical error model is adopted to capture the realistic performance of the installed Hyperlight Linear Fresnel collector. The sensitivity analysis can provide insightful guidance to inform the tightening and relaxation of tolerances during manufacturing and implementation of a new collector technology.
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Wind load analysis of a new Linear Fresnel receiver assembly design
Journal of Renewable and Sustainable Energy, 2018Co-Authors: Abhishek Parikh, Greg Mungas, Janna Martinek, Nicholas Kramer, Guangdong ZhuAbstract:A Linear Fresnel collector includes a low-profile reflector array and a receiver assembly with one or more absorber tubes and an optional secondary reflector. This combined optical system concentrates sunlight and converts it into thermal energy. The design of a receiver assembly is critical to the performance of a Linear Fresnel collector. A position deviation of a few centimeters for the receiver assembly can result in notably reduced performance, thus leading to a direct loss in revenue associated with thermal power production. Wind load is one of the most significant environmental factors that can alter the optical—and therefore thermal—performance of a solar power system due to displacements after installation. At the same time, an over-designed receiver assembly may add unnecessary construction cost to a typically high-cost-constrained system. Thus, wind load analysis is particularly important when considering optimal engineering design of a receiver assembly and its supporting structure to cost-effectively mitigate the impacts of wind. In this study, a detailed computational fluid dynamics (CFD) model is adopted to derive the wind load of a commercial Linear Fresnel receiver assembly. This wind load is then used as a reference to optimize the detailed engineering design. The CFD model is first carefully developed and benchmarked within a critical regime toward turbulence. The drag force, lift force, and vortex-shedding frequencies are derived at both the operating and survival wind-speed limits for target project deployment locations. The wind load analysis results provide a valuable reference for future engineering design and prototyping.A Linear Fresnel collector includes a low-profile reflector array and a receiver assembly with one or more absorber tubes and an optional secondary reflector. This combined optical system concentrates sunlight and converts it into thermal energy. The design of a receiver assembly is critical to the performance of a Linear Fresnel collector. A position deviation of a few centimeters for the receiver assembly can result in notably reduced performance, thus leading to a direct loss in revenue associated with thermal power production. Wind load is one of the most significant environmental factors that can alter the optical—and therefore thermal—performance of a solar power system due to displacements after installation. At the same time, an over-designed receiver assembly may add unnecessary construction cost to a typically high-cost-constrained system. Thus, wind load analysis is particularly important when considering optimal engineering design of a receiver assembly and its supporting structure to cost-eff...
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New adaptive method to optimize the secondary reflector of Linear Fresnel collectors
Solar Energy, 2017Co-Authors: Guangdong ZhuAbstract:Abstract Performance of Linear Fresnel collectors may largely depend on the secondary-reflector profile design when small-aperture absorbers are used. Optimization of the secondary-reflector profile is an extremely challenging task because there is no established theory to ensure superior performance of derived profiles. In this work, an innovative optimization method is proposed to optimize the secondary-reflector profile of a generic Linear Fresnel configuration. The method correctly and accurately captures impacts of both geometric and optical aspects of a Linear Fresnel collector to secondary-reflector design. The proposed method is an adaptive approach that does not assume a secondary shape of any particular form, but rather, starts at a single edge point and adaptively constructs the next surface point to maximize the reflected power to be reflected to absorber(s). As a test case, the proposed optimization method is applied to an industrial Linear Fresnel configuration, and the results show that the derived optimal secondary reflector is able to redirect more than 90% of the power to the absorber in a wide range of incidence angles. The proposed method can be naturally extended to other types of solar collectors as well, and it will be a valuable tool for solar-collector designs with a secondary reflector.
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History, current state, and future of Linear Fresnel concentrating solar collectors
Solar Energy, 2014Co-Authors: Guangdong Zhu, Tim Wendelin, Michael J. Wagner, Chuck KutscherAbstract:Abstract Linear Fresnel collectors are a type of concentrating solar power technology. In this paper, the technology’s technical features and aspects are first described via illustrations of various design concepts; then, the past low- and intermediate-temperature applications of Linear Fresnel collectors are reviewed and their state-of-the-art applications in utility-scale electricity generation are presented; finally, the performance, technical challenges, and future outlook of Linear Fresnel technology in the context of utility-scale power plants are summarized.
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Performance Evaluation and Outlook of Utility-Scale Linear Fresnel Technology
2013Co-Authors: Guangdong Zhu, Mike Wagner, Tim Wendelin, Chuck KutscherAbstract:As one of the viable concentrating solar power (CSP) technologies, Linear Fresnel collectors differ from parabolic troughs by virtue of their low-profile mirror arrays and fixed receiver assemblies. This technology is capable of achieving high concentration ratios and so is applicable to hightemperature solar power plant designs. In addition, its low wind profile and Linear nature lead to low system and operation and maintenance (O & M) costs. In this report two Linear Fresnel solar plant configurations, namely a direct steam generation (DSG) system and a direct high-temperature molten-salt plant, are examined via a levelized cost of electricity (LCOE) analysis. By treating LCOE as a function of the annual investment energy return (IER, or the ratio of annual net electricity to the total direct system cost) under various assumptions of O & M cost, a few plant scenarios employing high-temperature Linear Fresnel technology are carefully configured to meet the aggressive LCOE goals of 8 cents/kWh and 6 cents/kWh. The latter is the Department of Energy (DOE) SunShot Initiative goal aimed at making CSP cost competitive in the current energy market. In particular, a Linear Fresnel scenario with the potential to meet the SunShot goal is featured with a collector cost of $100/m 2 , an annual system energy efficiency of 18%, a storage system cost of $15/kWh-th, and an O & M cost of $7.5/MWh. One of the most aggressive assumptions is an advanced power block with about 52% cycle efficiency and a turbine inlet temperature of 700°C. This work addresses unanswered questions regarding Linear Fresnel cost and performance and identifies future research and development directions for Linear Fresnel technology, including economic optimization of collectors and receivers, development of physical plant performance models, development of automated O & M mechanisms and sophisticated plant control software. Copyright © 2013 by ASME.
Alessandro Barbon - One of the best experts on this subject based on the ideXlab platform.
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A study of the effect of the longitudinal movement on the performance of small scale Linear Fresnel reflectors
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, N BarbonAbstract:Abstract The sizing of a small-scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the applications. This paper presents the analysis of the effects of the longitudinal movement on the performance of small-scale Linear Fresnel reflectors. Our design, patented in year 2017, shows to be really innovative when compared to the existing designs shown in the literature. The three-movement option marks the novelty of the design. The effect of three parameters (i.e. energy absorbed by the absorber tube, primary cost, and reflector area ratio) is evaluated for two locations in Europe. Different configurations are analyzed and compared with the typical configuration of a large-scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the primary cost, and the reflector area ratio. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that both the energy absorbed by the absorber tube and the primary cost increase with longitudinal movement, while the reflector area ratio decreases.
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Investigating the influence of longitudinal tilt angles on the performance of small scale Linear Fresnel reflectors for urban applications
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, L. RodríguezAbstract:Abstract The potential use of the small scale Linear Fresnel reflectors in building applications can help European Union countries meet their sustainable development goals. The sizing of a small scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the urban applications. This paper presents the analysis of the effects of the longitudinal inclination of the rows of mirrors and/or the absorber tube on the performance of small scale Linear Fresnel reflectors. The effect of three parameters (i.e. energy absorbed by the absorber tube, energy area ratio, and primary cost) is evaluated for five cities in European Union. Different combinations of longitudinal tilt angles are analyzed and compared with the typical configuration of a large scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the energy area ratio, and the primary cost. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that the energy absorbed by the absorber tube increase strongly with longitudinal tilt angles, and the primary cost increases weakly with longitudinal tilt angles, while the energy-to-area ratio decreases.
Covadonga Bayón-cueli - One of the best experts on this subject based on the ideXlab platform.
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A study of the effect of the longitudinal movement on the performance of small scale Linear Fresnel reflectors
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, N BarbonAbstract:Abstract The sizing of a small-scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the applications. This paper presents the analysis of the effects of the longitudinal movement on the performance of small-scale Linear Fresnel reflectors. Our design, patented in year 2017, shows to be really innovative when compared to the existing designs shown in the literature. The three-movement option marks the novelty of the design. The effect of three parameters (i.e. energy absorbed by the absorber tube, primary cost, and reflector area ratio) is evaluated for two locations in Europe. Different configurations are analyzed and compared with the typical configuration of a large-scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the primary cost, and the reflector area ratio. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that both the energy absorbed by the absorber tube and the primary cost increase with longitudinal movement, while the reflector area ratio decreases.
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Investigating the influence of longitudinal tilt angles on the performance of small scale Linear Fresnel reflectors for urban applications
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, L. RodríguezAbstract:Abstract The potential use of the small scale Linear Fresnel reflectors in building applications can help European Union countries meet their sustainable development goals. The sizing of a small scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the urban applications. This paper presents the analysis of the effects of the longitudinal inclination of the rows of mirrors and/or the absorber tube on the performance of small scale Linear Fresnel reflectors. The effect of three parameters (i.e. energy absorbed by the absorber tube, energy area ratio, and primary cost) is evaluated for five cities in European Union. Different combinations of longitudinal tilt angles are analyzed and compared with the typical configuration of a large scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the energy area ratio, and the primary cost. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that the energy absorbed by the absorber tube increase strongly with longitudinal tilt angles, and the primary cost increases weakly with longitudinal tilt angles, while the energy-to-area ratio decreases.
Lorrène Bayon - One of the best experts on this subject based on the ideXlab platform.
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A study of the effect of the longitudinal movement on the performance of small scale Linear Fresnel reflectors
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, N BarbonAbstract:Abstract The sizing of a small-scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the applications. This paper presents the analysis of the effects of the longitudinal movement on the performance of small-scale Linear Fresnel reflectors. Our design, patented in year 2017, shows to be really innovative when compared to the existing designs shown in the literature. The three-movement option marks the novelty of the design. The effect of three parameters (i.e. energy absorbed by the absorber tube, primary cost, and reflector area ratio) is evaluated for two locations in Europe. Different configurations are analyzed and compared with the typical configuration of a large-scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the primary cost, and the reflector area ratio. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that both the energy absorbed by the absorber tube and the primary cost increase with longitudinal movement, while the reflector area ratio decreases.
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Investigating the influence of longitudinal tilt angles on the performance of small scale Linear Fresnel reflectors for urban applications
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, L. RodríguezAbstract:Abstract The potential use of the small scale Linear Fresnel reflectors in building applications can help European Union countries meet their sustainable development goals. The sizing of a small scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the urban applications. This paper presents the analysis of the effects of the longitudinal inclination of the rows of mirrors and/or the absorber tube on the performance of small scale Linear Fresnel reflectors. The effect of three parameters (i.e. energy absorbed by the absorber tube, energy area ratio, and primary cost) is evaluated for five cities in European Union. Different combinations of longitudinal tilt angles are analyzed and compared with the typical configuration of a large scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the energy area ratio, and the primary cost. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that the energy absorbed by the absorber tube increase strongly with longitudinal tilt angles, and the primary cost increases weakly with longitudinal tilt angles, while the energy-to-area ratio decreases.
N Barbon - One of the best experts on this subject based on the ideXlab platform.
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A study of the effect of the longitudinal movement on the performance of small scale Linear Fresnel reflectors
Renewable Energy, 2019Co-Authors: Alessandro Barbon, Covadonga Bayón-cueli, Lorrène Bayon, N BarbonAbstract:Abstract The sizing of a small-scale Linear Fresnel reflector directly influences its primary cost as well as the annual energy output and, hence, its financial attractiveness. In addition, the area required for its installation is a critical parameter in most of the applications. This paper presents the analysis of the effects of the longitudinal movement on the performance of small-scale Linear Fresnel reflectors. Our design, patented in year 2017, shows to be really innovative when compared to the existing designs shown in the literature. The three-movement option marks the novelty of the design. The effect of three parameters (i.e. energy absorbed by the absorber tube, primary cost, and reflector area ratio) is evaluated for two locations in Europe. Different configurations are analyzed and compared with the typical configuration of a large-scale Linear Fresnel reflector. Numerical simulations were carried out using a MATLAB code to calculate the energy absorbed by the absorber tube, the primary cost, and the reflector area ratio. The comparison of the configurations provided insight into how latitude impacts on the results. It will be demonstrated that both the energy absorbed by the absorber tube and the primary cost increase with longitudinal movement, while the reflector area ratio decreases.