The Experts below are selected from a list of 1065 Experts worldwide ranked by ideXlab platform
Rangan Banerjee - One of the best experts on this subject based on the ideXlab platform.
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thermal hydraulic simulation of absorber tubes in linear Fresnel Reflector solar thermal system using relap
Renewable Energy, 2016Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:This paper presents thermal hydraulic modelling and simulation in the absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system is carried out. The system is modelled using two-phase flow simulation software, RELAP5/MOD3.4. Although, RELAP5 is very commonly used in nuclear engineering design and simulation, it can be used for the simulation of solar thermal systems. Unlike other thermal systems like refrigerators and nuclear industries, there is significant heat loss from the surface of the absorber tube in a solar thermal system, which varies significantly with the temperature of the absorber tube wall. The recently developed temperature dependent heat loss has been incorporated in RELAP5 for variable net heat flux studies. The implementation of the temperature dependent heat losses has been verified by comparing the results obtained from RELAP with those obtained by Homogeneous Equilibrium Model. Parametric studies are carried out using verified RELAP model for different values of heat flux, mass flux, inlet subcooling and inlet pressure. The developed model can be considered as an effective tool for better and effective absorber LFR tube design under designed conditions.
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experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel Reflector solar thermal system
Renewable Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Shinu M Varghese, Suresh C Kumar, Shankar Viswanathan, Rangan BanerjeeAbstract:This paper presents the analysis of heat losses from the trapezoidal cavity receiver used in linear Fresnel Reflector (LFR) system. The experimental studies are conducted under laboratory conditions that are specially designed for this purpose. The effects of parameters such as the temperatures of the tube surface, depth of receiver, number of tubes, and emissivity of tubes are investigated. The loss of heat is taking place from the tube outer surface to glass cover, below the receiver and then glass cover to ambient. As part of this investigation, the system is modelled and simulated using computational fluid dynamics (CFD). After validation, contribution of convection and radiation to the total heat transfer are found out using CFD. Computational predictions are shown to be consistent with the experimental observations which show that the CFD model is a reliable tool for predicting heat loss and overall heat loss coefficient. It was found that losses due to convection are between 5 and 18% of the total heat losses.
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steady state hydrothermal analysis of the absorber tubes used in linear Fresnel Reflector solar thermal system
Solar Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract Linear Fresnel Reflector (LFR) solar thermal system is a promising technology in solar thermal applications. In LFR system, parallel absorber tubes (usually 8–16) are located inside a trapezoidal cavity, which receives reflected solar flux from the mirrors situated below it. The fluid (usually water) inside the tubes undergoes phase change due to the incident solar flux. The focus of this paper is to carry out hydrothermal analysis in an absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system. In the present work, a generic methodology to deal with steady state hydrothermal analysis of the absorber tubes has been discussed. The single phase regions as well as the two-phase region of the absorber tube have been analyzed. A one dimensional model has been used for the analysis for both the regions. In the two-phase region analysis is carried out under the assumption that the homogeneous equilibrium model is valid. For this hydrothermal analysis, the radiative and convective heat losses from the surface of the tube to the atmosphere are obviously needed. To obtain the heat losses, the computational analysis of the heat transfer in the trapezoidal cavity is carried out. The present model can be used to predict the variation of bulk fluid temperature, variation of heat transfer coefficient, pressure loss along the length under different mass flux and different solar flux, in single phase region. Similarly, variation of dryness fraction, local boiling two phase flow coefficient, and total pressure drop can be predicted for two phase region. This model can be used to understand and design for a better LFR system.
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analysis of heat losses from a trapezoidal cavity used for linear Fresnel Reflector system
Solar Energy, 2012Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract A Computational study to investigate the heat loss due to radiation and steady laminar natural convection flow in a trapezoidal cavity having eight absorber tubes for a Linear Fresnel Reflector (LFR) solar thermal system with uniformly heated tubes and adiabatic top wall and side walls has been performed. The losses due to convection and radiation were considered from the bottom glass cover. The results are validated with experimental data. Radiative component of losses from the cavity was found to be dominant which contributes around 80–90%. Heat loss characteristics have been studied for cavities of different depths. Simulations have been carried out for various values of heat transfer coefficient based on the wind speed below the glass surface. Effect of emissivities of the tubes on the heat loss has also been simulated. Flow pattern and isotherms inside the cavity for various depths have been analyzed. Finally, the correlation between the total average Nusselt number and its influencing parameters has been obtained for the proposed cavity.
Sudhansu S Sahoo - One of the best experts on this subject based on the ideXlab platform.
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thermal hydraulic simulation of absorber tubes in linear Fresnel Reflector solar thermal system using relap
Renewable Energy, 2016Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:This paper presents thermal hydraulic modelling and simulation in the absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system is carried out. The system is modelled using two-phase flow simulation software, RELAP5/MOD3.4. Although, RELAP5 is very commonly used in nuclear engineering design and simulation, it can be used for the simulation of solar thermal systems. Unlike other thermal systems like refrigerators and nuclear industries, there is significant heat loss from the surface of the absorber tube in a solar thermal system, which varies significantly with the temperature of the absorber tube wall. The recently developed temperature dependent heat loss has been incorporated in RELAP5 for variable net heat flux studies. The implementation of the temperature dependent heat losses has been verified by comparing the results obtained from RELAP with those obtained by Homogeneous Equilibrium Model. Parametric studies are carried out using verified RELAP model for different values of heat flux, mass flux, inlet subcooling and inlet pressure. The developed model can be considered as an effective tool for better and effective absorber LFR tube design under designed conditions.
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experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel Reflector solar thermal system
Renewable Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Shinu M Varghese, Suresh C Kumar, Shankar Viswanathan, Rangan BanerjeeAbstract:This paper presents the analysis of heat losses from the trapezoidal cavity receiver used in linear Fresnel Reflector (LFR) system. The experimental studies are conducted under laboratory conditions that are specially designed for this purpose. The effects of parameters such as the temperatures of the tube surface, depth of receiver, number of tubes, and emissivity of tubes are investigated. The loss of heat is taking place from the tube outer surface to glass cover, below the receiver and then glass cover to ambient. As part of this investigation, the system is modelled and simulated using computational fluid dynamics (CFD). After validation, contribution of convection and radiation to the total heat transfer are found out using CFD. Computational predictions are shown to be consistent with the experimental observations which show that the CFD model is a reliable tool for predicting heat loss and overall heat loss coefficient. It was found that losses due to convection are between 5 and 18% of the total heat losses.
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steady state hydrothermal analysis of the absorber tubes used in linear Fresnel Reflector solar thermal system
Solar Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract Linear Fresnel Reflector (LFR) solar thermal system is a promising technology in solar thermal applications. In LFR system, parallel absorber tubes (usually 8–16) are located inside a trapezoidal cavity, which receives reflected solar flux from the mirrors situated below it. The fluid (usually water) inside the tubes undergoes phase change due to the incident solar flux. The focus of this paper is to carry out hydrothermal analysis in an absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system. In the present work, a generic methodology to deal with steady state hydrothermal analysis of the absorber tubes has been discussed. The single phase regions as well as the two-phase region of the absorber tube have been analyzed. A one dimensional model has been used for the analysis for both the regions. In the two-phase region analysis is carried out under the assumption that the homogeneous equilibrium model is valid. For this hydrothermal analysis, the radiative and convective heat losses from the surface of the tube to the atmosphere are obviously needed. To obtain the heat losses, the computational analysis of the heat transfer in the trapezoidal cavity is carried out. The present model can be used to predict the variation of bulk fluid temperature, variation of heat transfer coefficient, pressure loss along the length under different mass flux and different solar flux, in single phase region. Similarly, variation of dryness fraction, local boiling two phase flow coefficient, and total pressure drop can be predicted for two phase region. This model can be used to understand and design for a better LFR system.
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analysis of heat losses from a trapezoidal cavity used for linear Fresnel Reflector system
Solar Energy, 2012Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract A Computational study to investigate the heat loss due to radiation and steady laminar natural convection flow in a trapezoidal cavity having eight absorber tubes for a Linear Fresnel Reflector (LFR) solar thermal system with uniformly heated tubes and adiabatic top wall and side walls has been performed. The losses due to convection and radiation were considered from the bottom glass cover. The results are validated with experimental data. Radiative component of losses from the cavity was found to be dominant which contributes around 80–90%. Heat loss characteristics have been studied for cavities of different depths. Simulations have been carried out for various values of heat transfer coefficient based on the wind speed below the glass surface. Effect of emissivities of the tubes on the heat loss has also been simulated. Flow pattern and isotherms inside the cavity for various depths have been analyzed. Finally, the correlation between the total average Nusselt number and its influencing parameters has been obtained for the proposed cavity.
A Barbon - One of the best experts on this subject based on the ideXlab platform.
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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: A Barbon, L Bayon, Covadonga Bayón-cueli, 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.
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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: A Barbon, L Bayon, Covadonga Bayón-cueli, 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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cost estimation relationships of a small scale linear Fresnel Reflector
Renewable Energy, 2019Co-Authors: A Barbon, L Bayon, J A Sanchezrodriguez, C BayoncueliAbstract:Abstract This paper presents a cost estimating relationship ( C E R ) of a novel small scale linear Fresnel Reflector ( S S L F R ). The C E R has been developed analyzing in detail the manufacturing processes of the S S L F R , its parameters, and the possible sub-components. As a result of this analysis, the SSLFR has been divided into 8 sub-components: fixed and mobile structures, movement units, mirror units, secondary Reflector system, tracking system, assembly, and foundation. These sub-components are described in detail and designed using Autodesk Inventor, specifying manufacturing materials and processes. The study includes a full stress analysis of the sub-components, considering self weight, snow loads, and wind loads. For each sub-component an estimate of the primary costs is presented and also a relationship between the cost and the geometric parameters of the S S L F R . The primary costs considered include material, labor, and tooling costs. A numerical example shows the suitability of the proposed approach.
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development of a fiber daylighting system based on a small scale linear Fresnel Reflector theoretical elements
Applied Energy, 2018Co-Authors: A Barbon, L Bayon, J A Sanchezrodriguez, N BarbonAbstract:This paper describes the details of the design of a small scale linear Fresnel Reflector (SSLFR) applied to a daylighting system based on optical fiber bundles (OFBs). This study shows the influence of the SSLFR design parameters (mirror width, mirror length, Reflector cavity height, and number of mirrors) and the parameters of the optical fiber. A new Reflector cavity is designed, consisting of two right trapeziums. Each trapezium collects the incident solar irradiance of the mirrors located at each side of the central mirror. The Reflector cavity has two focal points, located in the middle of the aperture of each trapezium. A MATLAB code was developed in order to obtain the optical efficiency of the new Reflector cavity and numerical simulations are presented. Two SSLFR configurations, C1 and C2, are studied. C1 is the configuration used in large-scale LFRs and does not consider lateral movement of the OFBs, as is the case in configuration C2. Each of these configurations is analyzed considering the optimal length and longitudinal position of the OFB. Numerical simulations are presented for both configurations using the MATLAB environment. Power consumption based calculations are carried out using the lumen method and the potential electric energy saving is evaluated. The illumination levels obtained are then compared using the lighting design software DIAlux, a free software widely used as a planning tool by lighting designers. The results show a considerable electric energy saving with configuration C2, although configuration C1 also presents good energy savings.
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parametric study of the small scale linear Fresnel Reflector
Renewable Energy, 2018Co-Authors: A Barbon, N Barbon, L Bayon, J A SanchezrodriguezAbstract:Abstract This paper addresses the influence of the transversal and longitudinal parameters in the performance of a small scale linear Fresnel Reflector (SSLFR) without longitudinal movement. The main purpose of this study is to show the influence of the design parameters (receiver height, mirror length, and mirror width) on the energy absorbed by the absorber tube. In addition, the influence of these parameters on the shading of the absorber tube is also analysed. Different configurations are analysed regarding the longitudinal angle that the mirrors and the absorber tube form with the horizontal plane. Each of these configurations is analysed considering the optimal length and longitudinal position of the absorber tube. Numerical simulations show the influence of mirror width, mirror length, and receiver height on the energy absorbed. The simulations allow us to analyze the monthly variation of this influence throughout the year, considering also the effect of the latitude. A sensitivity analysis is also carried out in order to evaluate the importance of the parameters.
Suneet Singh - One of the best experts on this subject based on the ideXlab platform.
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thermal hydraulic simulation of absorber tubes in linear Fresnel Reflector solar thermal system using relap
Renewable Energy, 2016Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:This paper presents thermal hydraulic modelling and simulation in the absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system is carried out. The system is modelled using two-phase flow simulation software, RELAP5/MOD3.4. Although, RELAP5 is very commonly used in nuclear engineering design and simulation, it can be used for the simulation of solar thermal systems. Unlike other thermal systems like refrigerators and nuclear industries, there is significant heat loss from the surface of the absorber tube in a solar thermal system, which varies significantly with the temperature of the absorber tube wall. The recently developed temperature dependent heat loss has been incorporated in RELAP5 for variable net heat flux studies. The implementation of the temperature dependent heat losses has been verified by comparing the results obtained from RELAP with those obtained by Homogeneous Equilibrium Model. Parametric studies are carried out using verified RELAP model for different values of heat flux, mass flux, inlet subcooling and inlet pressure. The developed model can be considered as an effective tool for better and effective absorber LFR tube design under designed conditions.
-
experimental investigation and computational validation of heat losses from the cavity receiver used in linear Fresnel Reflector solar thermal system
Renewable Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Shinu M Varghese, Suresh C Kumar, Shankar Viswanathan, Rangan BanerjeeAbstract:This paper presents the analysis of heat losses from the trapezoidal cavity receiver used in linear Fresnel Reflector (LFR) system. The experimental studies are conducted under laboratory conditions that are specially designed for this purpose. The effects of parameters such as the temperatures of the tube surface, depth of receiver, number of tubes, and emissivity of tubes are investigated. The loss of heat is taking place from the tube outer surface to glass cover, below the receiver and then glass cover to ambient. As part of this investigation, the system is modelled and simulated using computational fluid dynamics (CFD). After validation, contribution of convection and radiation to the total heat transfer are found out using CFD. Computational predictions are shown to be consistent with the experimental observations which show that the CFD model is a reliable tool for predicting heat loss and overall heat loss coefficient. It was found that losses due to convection are between 5 and 18% of the total heat losses.
-
steady state hydrothermal analysis of the absorber tubes used in linear Fresnel Reflector solar thermal system
Solar Energy, 2013Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract Linear Fresnel Reflector (LFR) solar thermal system is a promising technology in solar thermal applications. In LFR system, parallel absorber tubes (usually 8–16) are located inside a trapezoidal cavity, which receives reflected solar flux from the mirrors situated below it. The fluid (usually water) inside the tubes undergoes phase change due to the incident solar flux. The focus of this paper is to carry out hydrothermal analysis in an absorber tube of a Linear Fresnel Reflector (LFR) solar thermal system. In the present work, a generic methodology to deal with steady state hydrothermal analysis of the absorber tubes has been discussed. The single phase regions as well as the two-phase region of the absorber tube have been analyzed. A one dimensional model has been used for the analysis for both the regions. In the two-phase region analysis is carried out under the assumption that the homogeneous equilibrium model is valid. For this hydrothermal analysis, the radiative and convective heat losses from the surface of the tube to the atmosphere are obviously needed. To obtain the heat losses, the computational analysis of the heat transfer in the trapezoidal cavity is carried out. The present model can be used to predict the variation of bulk fluid temperature, variation of heat transfer coefficient, pressure loss along the length under different mass flux and different solar flux, in single phase region. Similarly, variation of dryness fraction, local boiling two phase flow coefficient, and total pressure drop can be predicted for two phase region. This model can be used to understand and design for a better LFR system.
-
analysis of heat losses from a trapezoidal cavity used for linear Fresnel Reflector system
Solar Energy, 2012Co-Authors: Sudhansu S Sahoo, Suneet Singh, Rangan BanerjeeAbstract:Abstract A Computational study to investigate the heat loss due to radiation and steady laminar natural convection flow in a trapezoidal cavity having eight absorber tubes for a Linear Fresnel Reflector (LFR) solar thermal system with uniformly heated tubes and adiabatic top wall and side walls has been performed. The losses due to convection and radiation were considered from the bottom glass cover. The results are validated with experimental data. Radiative component of losses from the cavity was found to be dominant which contributes around 80–90%. Heat loss characteristics have been studied for cavities of different depths. Simulations have been carried out for various values of heat transfer coefficient based on the wind speed below the glass surface. Effect of emissivities of the tubes on the heat loss has also been simulated. Flow pattern and isotherms inside the cavity for various depths have been analyzed. Finally, the correlation between the total average Nusselt number and its influencing parameters has been obtained for the proposed cavity.
L Bayon - One of the best experts on this subject based on the ideXlab platform.
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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: A Barbon, L Bayon, Covadonga Bayón-cueli, 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.
-
A study of the effect of the longitudinal movement on the performance of small scale linear Fresnel Reflectors
Renewable Energy, 2019Co-Authors: A Barbon, L Bayon, Covadonga Bayón-cueli, 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.
-
cost estimation relationships of a small scale linear Fresnel Reflector
Renewable Energy, 2019Co-Authors: A Barbon, L Bayon, J A Sanchezrodriguez, C BayoncueliAbstract:Abstract This paper presents a cost estimating relationship ( C E R ) of a novel small scale linear Fresnel Reflector ( S S L F R ). The C E R has been developed analyzing in detail the manufacturing processes of the S S L F R , its parameters, and the possible sub-components. As a result of this analysis, the SSLFR has been divided into 8 sub-components: fixed and mobile structures, movement units, mirror units, secondary Reflector system, tracking system, assembly, and foundation. These sub-components are described in detail and designed using Autodesk Inventor, specifying manufacturing materials and processes. The study includes a full stress analysis of the sub-components, considering self weight, snow loads, and wind loads. For each sub-component an estimate of the primary costs is presented and also a relationship between the cost and the geometric parameters of the S S L F R . The primary costs considered include material, labor, and tooling costs. A numerical example shows the suitability of the proposed approach.
-
development of a fiber daylighting system based on a small scale linear Fresnel Reflector theoretical elements
Applied Energy, 2018Co-Authors: A Barbon, L Bayon, J A Sanchezrodriguez, N BarbonAbstract:This paper describes the details of the design of a small scale linear Fresnel Reflector (SSLFR) applied to a daylighting system based on optical fiber bundles (OFBs). This study shows the influence of the SSLFR design parameters (mirror width, mirror length, Reflector cavity height, and number of mirrors) and the parameters of the optical fiber. A new Reflector cavity is designed, consisting of two right trapeziums. Each trapezium collects the incident solar irradiance of the mirrors located at each side of the central mirror. The Reflector cavity has two focal points, located in the middle of the aperture of each trapezium. A MATLAB code was developed in order to obtain the optical efficiency of the new Reflector cavity and numerical simulations are presented. Two SSLFR configurations, C1 and C2, are studied. C1 is the configuration used in large-scale LFRs and does not consider lateral movement of the OFBs, as is the case in configuration C2. Each of these configurations is analyzed considering the optimal length and longitudinal position of the OFB. Numerical simulations are presented for both configurations using the MATLAB environment. Power consumption based calculations are carried out using the lumen method and the potential electric energy saving is evaluated. The illumination levels obtained are then compared using the lighting design software DIAlux, a free software widely used as a planning tool by lighting designers. The results show a considerable electric energy saving with configuration C2, although configuration C1 also presents good energy savings.
-
parametric study of the small scale linear Fresnel Reflector
Renewable Energy, 2018Co-Authors: A Barbon, N Barbon, L Bayon, J A SanchezrodriguezAbstract:Abstract This paper addresses the influence of the transversal and longitudinal parameters in the performance of a small scale linear Fresnel Reflector (SSLFR) without longitudinal movement. The main purpose of this study is to show the influence of the design parameters (receiver height, mirror length, and mirror width) on the energy absorbed by the absorber tube. In addition, the influence of these parameters on the shading of the absorber tube is also analysed. Different configurations are analysed regarding the longitudinal angle that the mirrors and the absorber tube form with the horizontal plane. Each of these configurations is analysed considering the optimal length and longitudinal position of the absorber tube. Numerical simulations show the influence of mirror width, mirror length, and receiver height on the energy absorbed. The simulations allow us to analyze the monthly variation of this influence throughout the year, considering also the effect of the latitude. A sensitivity analysis is also carried out in order to evaluate the importance of the parameters.
