The Experts below are selected from a list of 23352 Experts worldwide ranked by ideXlab platform
Omar M Alrabghi - One of the best experts on this subject based on the ideXlab platform.
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measurements of Solar flux density distribution on a plane receiver due to a flat heliostat
Solar Energy, 1995Co-Authors: Moustafa M. Elsayed, K Fathalah, Omar M AlrabghiAbstract:Abstract An experimental facility is designed and manufactured to measure the Solar flux density distribution on a central flat receiver due to a single flat heliostat. The tracking mechanism of the heliostat is controlled by two stepping motors, one for tilt angle control and the other for azimuth angle control. A x-y traversing mechanism is also designed and mounted on a vertical central receiver plane, where the Solar flux density is to be measured. A miniature Solar Sensor is mounted on the platform of the traversing mechanism, where it is used to measure the Solar flux density distribution on the receiver surface. The Sensor is connected to a data acquisition card in a host computer. The two stepping motors of the heliostat tracking mechanism and the two stepping motors of the traversing mechanism are all connected to a controller card in the same host computer. A software “TOWER” is prepared to let the heliostat track the sun, move the platform of the traversing mechanism to the points of a preselected grid, and to measure the Solar flux density distribution on the receiver plane. Measurements are carried out using rectangular flat mirrors of different dimensions at several distances from the central receiver. Two types of images were identified on the receiver plane—namely, apparent (or visible) and mirror-reflected radiation images. Comparison between measurements and a mathematical model validates the mathematical model.
Nakhoda, Yusuf Ismail - One of the best experts on this subject based on the ideXlab platform.
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INTEGRATION OF Solar TRACKER AND MAXIMUM POWER POINT TRACKING FOR IMPROVING PHOTOVOLTAIC (PV)SYSTEM EFFICIENCY
ICIC International, 2020Co-Authors: Soetedjo Aryuanto, Sulistiawati, Irrine Budi, Nakhoda, Yusuf IsmailAbstract:This paper presents a method to integrate the Solar tracker and the maximum power point tracking (MPPT) to improve the photovoltaic (PV) system efficiency. The integrated system provides a closed-loop Solar tracker without the Sensors. Instead of using the Solar Sensor, the output power of the MPPT is employed as the feedback signal to the Solar tracker. The Solar tracker estimates the Solar azimuth and elevation angles using an astronomical algorithm based on the latitude, longitude and the date-time of the local site. To improve the Solar tracking accuracy, the fuzzy logic controller is employed to adjust the angle according to the power slope of maximum power with respect to the Solar tracker angle. From the simulation results, the proposed method increases the PV energy by 23.23% compared to the fixed PV panel. It improves the efficiency of the existing integrated Solar tracker by 0.25% based on the simulation models
Moustafa M. Elsayed - One of the best experts on this subject based on the ideXlab platform.
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measurements of Solar flux density distribution on a plane receiver due to a flat heliostat
Solar Energy, 1995Co-Authors: Moustafa M. Elsayed, K Fathalah, Omar M AlrabghiAbstract:Abstract An experimental facility is designed and manufactured to measure the Solar flux density distribution on a central flat receiver due to a single flat heliostat. The tracking mechanism of the heliostat is controlled by two stepping motors, one for tilt angle control and the other for azimuth angle control. A x-y traversing mechanism is also designed and mounted on a vertical central receiver plane, where the Solar flux density is to be measured. A miniature Solar Sensor is mounted on the platform of the traversing mechanism, where it is used to measure the Solar flux density distribution on the receiver surface. The Sensor is connected to a data acquisition card in a host computer. The two stepping motors of the heliostat tracking mechanism and the two stepping motors of the traversing mechanism are all connected to a controller card in the same host computer. A software “TOWER” is prepared to let the heliostat track the sun, move the platform of the traversing mechanism to the points of a preselected grid, and to measure the Solar flux density distribution on the receiver plane. Measurements are carried out using rectangular flat mirrors of different dimensions at several distances from the central receiver. Two types of images were identified on the receiver plane—namely, apparent (or visible) and mirror-reflected radiation images. Comparison between measurements and a mathematical model validates the mathematical model.
Soetedjo Aryuanto - One of the best experts on this subject based on the ideXlab platform.
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INTEGRATION OF Solar TRACKER AND MAXIMUM POWER POINT TRACKING FOR IMPROVING PHOTOVOLTAIC (PV)SYSTEM EFFICIENCY
ICIC International, 2020Co-Authors: Soetedjo Aryuanto, Sulistiawati, Irrine Budi, Nakhoda, Yusuf IsmailAbstract:This paper presents a method to integrate the Solar tracker and the maximum power point tracking (MPPT) to improve the photovoltaic (PV) system efficiency. The integrated system provides a closed-loop Solar tracker without the Sensors. Instead of using the Solar Sensor, the output power of the MPPT is employed as the feedback signal to the Solar tracker. The Solar tracker estimates the Solar azimuth and elevation angles using an astronomical algorithm based on the latitude, longitude and the date-time of the local site. To improve the Solar tracking accuracy, the fuzzy logic controller is employed to adjust the angle according to the power slope of maximum power with respect to the Solar tracker angle. From the simulation results, the proposed method increases the PV energy by 23.23% compared to the fixed PV panel. It improves the efficiency of the existing integrated Solar tracker by 0.25% based on the simulation models
Laó Amores, Javier Jesús - One of the best experts on this subject based on the ideXlab platform.
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Desarrollo de sistema de calibrado automático de espejos de captador Solar tipo Fresnel
2020Co-Authors: Laó Amores, Javier JesúsAbstract:El planteamiento original de este proyecto fue volver a poner en funcionamiento la planta Solar de tipo fresnel instalada en la azotea del edificio principal de la ETSI. Para ello se realizó un estudio previo para valorar el estado actual de la instalación. Una vez realizado dicho estudio, se decidió actuar sobre los servomotores estropeados y la infraestructura de la comunicación entre el campo y el autómata programable. La contratación de estos trabajos fue interrumpida por la implantación del estado de alarma en todo el territorio nacional. Como consecuencia hubo que replantear el proyecto para poder continuarlo de forma no presencial y que los resultados obtenidos pudiesen contribuir a la posterior puesta en marcha de la planta. Esta nueva orientación ha consistido en elaborar un simulador de la planta en un entorno que permitiese la comunicación ModBus sobre TCP/IP entre este y el software utilizado para la programación del autómata programable. Además, se ha mejorado el programa de calibración por uno automático que ha sido testeado en el propio simulador.In this project we will study the state of the linear fresnel reflector installed on the rooftop of the ETSI. Once the current status of the plant was checked, a new start up was necessary. For this purpose, a new automatic calibration program was developed. The calibration program makes use of a Solar Sensor to determine in which position the reflectors concentrate the maximum number of Solar beams to the collector. However, it could not be tested directly in the Solar plant due to the state of alarm initiated in March 2020 which did not allowed perform this task at the ETSI. To overcome this issue, a simulator of the Solar plant has been developed in the game engine Unity 3D. The main language used for the simulator was UnityScript and the configuration of the simulated linear fresnel reflector matches with the real one. The communication between the simulator and the calibration program in Unity Pro XL was executed through ModBusTCP/IP. Finally, the calibration program was proved in the developed simulator achieving good results. The main Sensor for the calibration was coded in three different ways and two different calibration programs were tested in order to decide which of them was the best combination. The result showed that the most appropriate way to calibrate the Solar plant is to use the Sensor based on incremental steps with the calibration program that detects the peak of the Sensor output.Universidad de Sevilla. Grado en Ingeniería Electrónica, Robótica y Mecatrónic
