Experimental Analysis of Partial Shading on Solar Panels With Theuse of Aluminium Reflectors
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In the present-day world, energy is the key requirement without which man cannot persist. Solar energy is the one of the most significant sources of energy. Solar energy is very plentiful and endless when compared to other sources of energies. But Environment variation is becoming a worldwide concern. Shading effect due to trees, momentary of clouds, shadows of nearby obstacles, adjacent buildings and any other means is affected the enactment of solar panels. It causes substantial efficiency degradation, meanwhile shaded and non-shaded PV modules have large inconsistency in their maximum power points. In order to mitigate, the negative effect of each PV module from partial shading using by-pass diodes. However, this method alone may still face severe energy efficiency degradation caused by the energy loss. Reflectors can be used to increase the efficiency of solar panels. Reflector is used to increase the amount of solar radiation that the solar panels can be exposed with, therefore increasing the production of electric power. Aluminum foil reflector and stainless-steel mirror can also increase power output of solar panels. In this paper the efficiency method for PV systems under partial shading with and without the use of reflectors have been analyzed.Keywords:
Shading
Reflector (photography)
Solar Power
The present paper presents theoretical analysis of the instantaneous, daily, and yearly enhancement in solar energy collection of tilted flat-plate solar collector augmented by a plane reflector. The shadow effect due to the reflector on the collector is considered in the analysis. A FORTRAN computer program has been constructed based on the analysis to optimize different operational and design parameters of plane reflector-tilted flat-plate solar collector systems. These parameters include reflector-collector system orientation and tilt angles, collector elongation ratio, and reflector overhang ratio.
Reflector (photography)
Parabolic reflector
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Reflector (photography)
Concentrator
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Thermosiphon
Solar cable
Solar simulator
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Sunlight is composed of photons, or particles of solar energy. When photons strike a photovoltaic (PV) cell, they may be reflected, pass right through, or be absorbed. Only the absorbed photons provide energy to generate electricity. Solar thermal technologies use concentrator systems to achieve the high temperatures needed to heat the fluid. The three main types of solar thermal power systems are parabolic trough, solar dish, and solar power tower. A parabolic trough collector has a long parabolic shaped reflector that focuses the sun's rays on a receiver pipe located at the focus of the parabola. A solar dish/engine system uses concentrating solar collectors that track the sun, so they always point straight at the sun and concentrate the solar energy at the focal point of the dish. Solar power tower generates electricity from sunlight by focusing concentrated solar energy on a tower-mounted heat exchanger.
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Parabolic reflector
Sunlight
Thermal energy
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Two solar photovoltaic-thermal (PVT) energy conversion systems are described and their performance tested under laboratory conditions. One of these was a simple Flat Plate (FP-PVT) design, with headers and risers for heat removal the other a fixed linear axis Compound Parabolic Concentrating solar PVT (CPC-PVT) energy conversion system with a heat-pipe for removal of solar gain. Both had a low iron glass cover for high transmissivity of solar radiation, and polycrystalline silicon solar photovoltaic cells adhered to the absorber. Heat loss coefficient for the FP-PVT collector was measured as 4.1W/m2/K and 3.5W/m2/K for the CPC-PVT solar collector. These solar collectors were tested under steady state conditions using the solar simulator facility at the University of Ulsterâs Centre for Sustainable Technologies. The FP-PVT and the CPC-PVT had a combined efficiency of 66.8% and 53.4% respectively producing both heat and power.
Thermal energy
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This paper presents a theoretical study to determine the capacity of collecting solar energy, thus improving the electrical performance of a photovoltaic collector in a horizontal position mounted by a mirror. In order to validate the presented results, they have been compared with experimental results found in literature by respecting the same conditions and the same properties of the system employed in the experimental study. By combining a reflecting mirror and a photovoltaic collector, the solar radiation collected, which depends on the optimal orientation of the mirror, is improved. Therefore, the aim of this work is to find the optimal angles of the mirror, which depends on the sun elevation angle, the azimuth angle for typical days. Consequently, after a critical analysis of the sum of daily solar radiation collected by the solar collector with and without the reflector, a significant increase in solar radiation has been noticed using the reflector.
Reflector (photography)
Elevation (ballistics)
Position (finance)
Elevation angle
Inclination angle
Parabolic reflector
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Solar energy is the most abundant source of renewable energy. Solar radiation is converted into thermal energy and subsequently to electrical energy by solar thermal concentrating systems. Concentrated solar power systems use solar absorbers to convert sunlight to thermal electric power. Solar absorbers are coated with solar selective coatings with high solar absorptance and low thermal emittance. Spectrally selective coatings which are stable up to temperatures 400C (in air and vacuum) have been developed in the past. However, in order to increase the efficiency of solar thermal power plants, solar selective coatings with high thermal stability are required. In recent years, great advances have been made in the field of solar selective coatings with high solar absorptance and low thermal emittance at higher temperatures (T > 450C). Transition metal based solar selective coatings in particular, have emerged as novel high temperature solar selective coatings which can be used for solar thermal power plants for electricity generation. Further research is currently underway in order to increase the thermal stability of the coatings and subsequently improve the efficiency of solar thermal power plants. We present a comprehensive review of sputter deposited mid- to high-temperature solar selective coatings used for solar thermal applications. This report also describes in detail about the commercially available sputter deposited solar selective coatings for flat-plate/evacuated tube collector and solar thermal power generation applications. The worldwide scenario of parabolic trough power plants which are in operation and, under development is discussed in brief.
Selective surface
Parabolic trough
Concentrated solar power
Solar Power
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