The Experts below are selected from a list of 25266 Experts worldwide ranked by ideXlab platform
Mohamed M. Sabry - One of the best experts on this subject based on the ideXlab platform.
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V-TROUGH CONCENTRATOR ON A PHOTOVOLTAIC FULL TRACKING SYSTEM IN A HOT DESERT CLIMATE
Renewable Energy, 1995Co-Authors: M.a. Mosalam Shaltout, A.e. Ghettas, Mohamed M. SabryAbstract:A V-trough concentrator with a Two-Axis Tracker system to increase the performance of photovoltaics was designed by the authors and installed on the roof-top of the building of the National Research Institute of Astronomy and Geophysics at Helwan in South Cairo. The V-trough concentrator system comprises two flat mirrors with dimensions 50 cm × 18 cm. They are fixed with the reflecting surfaces facing each other with a separation of about 11 cm, on a wooden table of 50 cm axis length. A sample of polycrystalline and amorphous silicon solar cells were fixed into the system, and similar solar cells of each type were fixed separate to the system, to estimate the electrical gain. The measurements were performed daily at different air masses for one complete year. The temperature of the solar cells in and out of the system were measured for comparison. Also, measurements for beam and global solar radiation and other meteorological conditions were recorded. The optical losses of the system were analyzed and details of collectable energy calculations are presented. The energy gain from the isolated contribution of the V-trough concentrators is also evaluated.
Gabriele Comodi - One of the best experts on this subject based on the ideXlab platform.
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Performance Analysis of a 3.5 kWp CPV System with Two-Axis Tracker
Energy Procedia, 2014Co-Authors: Massimiliano Renzi, M. Santolini, Gabriele ComodiAbstract:Abstract This paper presents the preliminary operational results of two 3.5 kWp CPV systems using triple junction III-V solar cells and a Two-Axis tracking mechanism. The plant is installed in the campus of the Universita Politecnica delle Marche (Ancona, Central Italy). The concentration optics consists of a primary Fresnel lens and a secondary reflective optics with an overall geometrical concentration ratio of 476 X. An experimental measurement setup acquires the main plant operating and ambient quantities; the paper reports the first months of plant operation with particular focus on the influence of the available radiation and the ambient temperature on the performance of the system. The electric output has a linear trend with the available direct normal radiation while ambient temperature has a minor effect on the performance of the CPV systems; also the influence of the Air Mass coefficient is reported.
Fotis Mavromatakis - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Photodiode-based Pyranometers and Reference Solar Cells on a Two-Axis Tracking System
2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC 28th PVSEC & 34th EU PVSEC), 2018Co-Authors: Frank Vignola, Josh Peterson, Rich Kessler, Mike Dooraghi, Manajit Sengupta, Fotis MavromatakisAbstract:The performance of photodiode-based pyranometers and reference solar cells are examined on a Two-Axis Tracker surface. This is the third in a series of papers examining the performance of photodiode-based pyranometers and reference solar cells on fixed and tracking surfaces. Because the instruments are oriented normally to the incident radiation, angle-of-incidence effects are minimized. By removing the angle-of-incidence effects inherent in earlier studies, the change in the sensor's clear sky responsivity can be more clearly identified. It was found that the photodiode-based pyranometers demonstrate a larger change in responsivity than the reference solar cells. Spectral measurements are recommended to verify the cause of this difference.
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A highly efficient novel azimuthal heliotrope
Solar Energy, 2008Co-Authors: Fotis Mavromatakis, Y. FranghiadakisAbstract:Abstract A new type of a single-axis azimuthal Tracker is presented. The novel feature of this Tracker is the ability to move the collector’s plane in two directions through a special support structure. This structure consists of a sliding mechanism on the central axis and a curved window on the cylindrical surface coaxial to the central axis. Consequently, the proposed novel heliotrope behaves similarly to a Two-Axis Tracker. Two different windows designed on the cylindrical surface may be used to provide very high efficiencies throughout a year. Several performance measurements have been conducted on this novel Tracker, a polar Tracker and the reference Two-Axis Tracker. Pyranometers, appropriately calibrated, were installed on all three systems to record the global incoming irradiance on the collector’s plane. It is shown that the new Tracker system can be very efficient since its plane intercepts, at least, 98% of the insolation with respect to a Two-Axis Tracker. The proposed system can be utilized in solar-related applications (photovoltaic or thermal).
M.a. Mosalam Shaltout - One of the best experts on this subject based on the ideXlab platform.
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V-TROUGH CONCENTRATOR ON A PHOTOVOLTAIC FULL TRACKING SYSTEM IN A HOT DESERT CLIMATE
Renewable Energy, 1995Co-Authors: M.a. Mosalam Shaltout, A.e. Ghettas, Mohamed M. SabryAbstract:A V-trough concentrator with a Two-Axis Tracker system to increase the performance of photovoltaics was designed by the authors and installed on the roof-top of the building of the National Research Institute of Astronomy and Geophysics at Helwan in South Cairo. The V-trough concentrator system comprises two flat mirrors with dimensions 50 cm × 18 cm. They are fixed with the reflecting surfaces facing each other with a separation of about 11 cm, on a wooden table of 50 cm axis length. A sample of polycrystalline and amorphous silicon solar cells were fixed into the system, and similar solar cells of each type were fixed separate to the system, to estimate the electrical gain. The measurements were performed daily at different air masses for one complete year. The temperature of the solar cells in and out of the system were measured for comparison. Also, measurements for beam and global solar radiation and other meteorological conditions were recorded. The optical losses of the system were analyzed and details of collectable energy calculations are presented. The energy gain from the isolated contribution of the V-trough concentrators is also evaluated.
Massimiliano Renzi - One of the best experts on this subject based on the ideXlab platform.
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Performance Analysis of a 3.5 kWp CPV System with Two-Axis Tracker
Energy Procedia, 2014Co-Authors: Massimiliano Renzi, M. Santolini, Gabriele ComodiAbstract:Abstract This paper presents the preliminary operational results of two 3.5 kWp CPV systems using triple junction III-V solar cells and a Two-Axis tracking mechanism. The plant is installed in the campus of the Universita Politecnica delle Marche (Ancona, Central Italy). The concentration optics consists of a primary Fresnel lens and a secondary reflective optics with an overall geometrical concentration ratio of 476 X. An experimental measurement setup acquires the main plant operating and ambient quantities; the paper reports the first months of plant operation with particular focus on the influence of the available radiation and the ambient temperature on the performance of the system. The electric output has a linear trend with the available direct normal radiation while ambient temperature has a minor effect on the performance of the CPV systems; also the influence of the Air Mass coefficient is reported.
