Fresnel s equations for reflection and transmission incident, transmitted, and reflected beams boundary conditions. Singh carried out experiments to study the temperature of the. Linear fresnel reflector lfr everything about solar energy. It has been a long wait, given the technology was first developed for power generation back in the 1960s. A compact linear fresnel reflector clfr also referred to as a concentrating linear fresnel. These systems are hybrid collectors by combining ptc and lfr. The lfr concept uses a set of long mirror facets that re.
Linear concentration of solar energy by multiple flat or slightly curved surfaces basic components. Of interest is the construction of a solar field based on compact linear fresnel reflectors 3 made in the form of a solar adapter to existing thermal electric power stations in order to produce compressed hot water or saturated steam. Stela world stecsp technologies linear fresnel reflector. Linear fresnel systems and the future for concentrated solar. The principle of this lens is the breaking of the continuous surface of a standard lens into a set of surfaces with discontinuities between them. In the present study, the proposed p2g plant is located near seville, south spain.
The reflector strips are moved in a way that they always reflect the sunlight on to the receiver tubes. Design and analysis of rooftop linear fresnel reflector. Circular fresnel reector with elliptical plate zones. Compact linear fresnel reflector clfr power plant technology. Fresnels equations in optics r 100% laser medium r 90% 0% reflection. Novatec solar and areva solar, the markets leading fresnel providers, share their latest technology developments. Linear fresnel reflectors use long, thin segments of mirrors to focus sunlight onto a fixed absorbed at a common focal point of the reflectors. The optimal linear fresnel reflector nn individual presents an increase of 2.
But rather than using trough or dishshaped mirrors common to other concentrating solar systems, arevas technology uses a system of nearly flat mirrors, arranged in louverlike arrays and motorized to track the sun, to. Combining several systems in one significantly decreases the thermal resistance and reduces the. This study describes the design and construction of a lowcost linear fresnel solar. Linear and spot lenses look similar in terms of the circular fresnel pattern but a spot lens may appear more transparent. These systems lower cost and increase output by using absorbers that share mirrors. Linear fresnel reflector lfr solar power generation fig.
Theoretical elements for the design of a small scale linear fresnel. The linear fresnel solar thermal system has a rectangular mirror field made up of a number of horizontal reflectors with one rotatig shaft. Material and component specifications linear fresnel reflector. The monte carlo raytracing model is redesigned for the annual optical efficiency. This paper designed a new movement for the linear fresnel reflector system. Linear fresnel reflector system, light tracking analysis, loss of cosineeffect. Many lasers use brewsters angle components to avoid reflective losses. A numerical model of a linear frensel reflector lfr with oriented facets is suggested. Table 3 parabolic trough linear fresnel integration can be integrated easier into industrial processes with direct steam generation installation can be installed in spaces with very limited maximum length 20 metres easier installation on roofs because of more distributed. Linear fresnel reflector based solar radiation concentrator.
Jan 14, 2010 but parabolic trough reflector performance is still superior. Clfr is a linear fresnel reflector system with several or many linear absorbers in the system, allowing the construction of plants in the multimegawatt range fig. Linear fresnel technology may be poised to take centre stage, but its performance needs polishing. The first of these is giving the concentrator the ability to follow the sun, that is, the mirrors and the frame of the reflector automatically rotate as the sun moves throughout the day. Dec 16, 2010 a numerical model of a linear frensel reflector lfr with oriented facets is suggested. Compact linear fresnel reflector how is compact linear. Linear fresnel systems, which are a type of linear concentrator, are active in germany, spain, australia, india, and the united states. Fresnel reflector definition of fresnel reflector by the.
The potential of new tracking methods combining the existing. Fresnel reflector synonyms, fresnel reflector pronunciation, fresnel reflector translation, english dictionary definition of fresnel reflector. But technology developers say recent efficiency improvements now. An array of linear narrow and long mirrors mounted on an axis which can be rotated to align to the sunlight individually. Mar 28, 2018 energy3d simulations of linear fresnel reflector solar power plants around the world. Pdf a linear fresnel reflector as a solar system for. Pdf solar concentrating power is one of the most promising ways of. Acceptance testing procedure for linear fresnel reflector. Parametric study of the small scale linear fresnel reflector. Pdf a linear fresnel reflector as a solar system for heating water. An uncertainty u is calculated with a root sum square technique combining these two elements by. These mirrors are capable of concentrating the suns energy to. The most common designs are linear fresnel reflector lfr and compact linear fresnel reflectors clfr. The linear fresnel reflector technology receives its name from the fresnel lens, which was developed by the french physicist augustinjean fresnel for lighthouses in the 18th century.
Comprehensive examinations prove this new models reliability and efficiency. Pdf linear fresnel reflector based solar radiation. A new optical optimization model for linear fresnel reflector concentrators is proposed. Dec 06, 2017 a linear linear fresnel reflector clfr also referred to as a concentrating linear fresnel reflector is a specific type of linear fresnel reflector lfr technology. Linear fresnel reflector an overview sciencedirect topics. The sunlight is further concentrated by a small linear concave mirror to the evacuatedtube absorber. Compact linear guide lm roller the lm roller is a compact linear guide with high load performance and a mallet type roller able to make infinite circular motions. Modelling of cavity receiver heat transfer for the compact.
Parametric study of the small scale linear fresnel re. Thermal analysis of the performance of linear fresnel. A novel optical optimization model for linear fresnel. Pdf progress in the design and the applications of linear fresnel. Linear fresnel collectors a technology overview sfera summer school 2012 june 28, 2012, almeria, spain jan fabian feldhoff email. Linear fresnel reflector uses a single axis tracking system. It can automatically track the sun to reflect and collect the sunlight into the linear light concentrator that is parallel to the top of the mirror field. Arevas compact linear fresnel reflector technology.
A compact linear fresnel reflector clfr also referred to as a concentrating linear fresnel reflector is a specific type of linear fresnel reflector lfr technology. Conventional linear fresnel reflector system only contains onedimension movement that is flat mirror rotation, and the addition movement in new design includes translating mirror field to decrease cosine effect and rotating the secondary reflector to coordinate the translation of mirror field. Linear fresnel systems and the future for concentrated. The performance of the system depends on the design parameters, mass flow rate, etc. Linear fresnel reflector how is linear fresnel reflector.
Linear fresnel reflector solar concentrator technology is similar to solar trough technology in which the sunlight is reflected by a series of mirrors onto an absorber tube, thus linear f resnel reflector solar concentrator, is a linear line concentrator. In the case of parabolic reectors, the position of the feeder is. The linear fresnel concentrating solar mechanism is composed of the parallel reflective surfaces usually flat mirrors, the metal structure, the tracking mechanism, the secondary receiver optionally and the receiver. A comparative study between parabolic trough collector and linear fresnel reflector technologies. Steamcircuit model for the compact linear fresnel reflector. Leveling of land is not necessary and thus less expensive. Linear fresnel reflector based solar radiation concentrator for combined heating and power. Pdf a comparative study between parabolic trough collector. Compact linear fresnel reflector how is compact linear fresnel reflector abbreviated. Linear fresnel reflector lfr is one of the major concentrating solar systems for. This product is optimally applicable to machines required for high positioning accuracy, repeatability and rigidity. Computer simulation of linear fresnel reflectors youtube. The motional design and analysis for linear fresnel. Its goal is to provide highpressure steam from a system configuration that is cheaper than other designs.
Arevas compact linear fresnel reflector technology helioscsp. Land use is less because of efficient use of space. Results and comparison from the sam linear fresnel technology. Aveek chatterjee1, eva bernal2, satya seshadri1, oliver mayer2, and mikal greaves3. The fresnel principle the linear fresnel reflector technology receives its name from the fresnel lens, which was developed by the french physicist augustinjean fresnel for lighthouses in the 18th century. Design and analysis of rooftop linear fresnel reflector solar concentrator k. The principal design flaw, however, is that shading is produced from adjacent reflectors, lowering the overall output of the system. Spot and linear fresnel lenses both types of lenses can be used for solar cooking and boiling water. Optimization of the distribution of small scale linear fresnel. Figure 3 omitted figure 4 omitted compact linear fresnel reflector clfr use flat reflectors instead of parabolic mirrors, that move on a single axis and fresnel lenses to concentrate the solar thermal energy in collectors figure 4, right. Design and analysis of rooftop linear fresnel reflector solar. A linear fresnel reflector as a solar system for heating water. There are three types of fresnel lenses, linear, spot, and continuous linear. Concentrations of the linear fresnel reflector with the.
Real suntracking linear solar concentrators imperfectly follow the solar disc, opera tionally sustaining both transverse and axial misalignments. By heba hashem linear fresnel is a linefocusing technology similar to the parabolic trough in that it consists of reflectors that track the sun in one axis and focus the beam radiation onto fluidcarrying receiver tubes. Linear fresnel reflector system, light tracking analysis, loss of cosine effect. Results and comparison from the sam linear fresnel. Energy3d simulations of linear fresnel reflector solar power plants around the world. Fresnel lens prisms that make up a fresnel lens bend and magnify light rays, creating a single, concentrated beam of light. Arevas compact linear fresnel reflector technology uses mirrors to concentrate sunlight to directly create steam power. Parallel mirrors at ground level focus light onto a linear radiationabsorber positioned above them. Clfr individual reflectors can have the option of directing reflected solar radiation to at least two absorbers in linear systems. If optical efficiency of a parabolic trough collector is in the range of 7880 percent, a linear fresnel collector is 70 percent in the best case, says markus eck, from the institute of technical thermodynamics at dlr.
Jan 24, 2015 compact linear fresnel reflector technology by cnim. Designed to be fit into a groove machined on the mounting surface. Flat or slightly curved mirrors mounted on trackers on the ground are configured to reflect sunlight onto a receiver tube fixed in space above the mirrors. The following picture shows such a lighthouse fresnel lense. Mixing arched fresnel lenstriplejunction cell cpv array in space in 1998 deep space 1, and this awardwinning array performed as predicted over the full 38month mission, the first space mission to be powered by triplejunction cells. The principle of this lens is the breaking of the continuous surface of a standard lens. Linear fresnel reflectors generally produce steam directly and do away with the requirement of expensive heat exchangers. Fresnel reflector an overview sciencedirect topics. The concentrating performances of linear frensel reflectors are determined by considering the errors of manufacturing and facet positioning relative to the sun. This report details an analysis of the solar concentration performance of a linefocusing, flat base fresnel lens in the presence of small transverse tracking errors. The compact linear fresnel reflector clfr, shown in figure 1 is a concept for a largescale solar thermal power plant. They are named for their similarity to a fresnel lens, in which many small, thin lens fragments are combined to simulate a much thicker simple lens. Optical characteristics of linear fresnel collectors lfc. Fresnel lens what is it, testing focal length, solar heat generated.
Design parameters optimization and theoretical performance. Satyanarayana mechanical engineering department,k l university, guntur 522501 abstractmany applications of thermal energy, both in industrial and power sectors require medium temperatures ranging from 100c to 250c. A second linear concentrator technology is the linear fresnel reflector system. Sanchezrodriguez a a department of electrical engineering, university of oviedo, campus of gijon, spain b department of mathematics, university of oviedo, campus of gijon, spain article info article history. Rational opticalgeometrical parameters of linear frensel reflectors are revealed. By emma clarke linear fresnel technology, a latecomer to the csp market, is about to make its entrance. The linear fresnel reflector lfr concept uses a set of long mirror facets that reflect light to a linear receiver where it can be directly absorbed by the receiver 3 or concentrated a second time with a compound parabolic reflector 4. It is shown that an lfr can operate efficiently for eight. Underlying principle the linear fresnel reflector is made up of multiple mirrors. Optical fibers only work because of total internal reflection. In india, reliance power has completed and connected to the grid a 125 mw compact linear fresnel reflector plant, designed and constructed by areva solar.
Pdf this work is concerned with assessing the thermal performances of a solar water heating system which is dependent on a linear fresnel. It is intended to be a lowcost solar thermal energy system for medium to largescale thermal energy capture. About the linear fresnel reflector technology linear fresnel reflectors use stretched narrow segments of mirrors to focus sunlight onto a fixed metal collector pipe that runs axially above the array of reflectors located at a common focal point of the reflectors. Acceptance testing procedure for linear fresnel reflector solar. Coupling of a solidoxide cell unit and a linear fresnel. This paper presents the new linear fresnel technology performance model in nrels system advisor model. Lfr linear fresnel reflector solar energy acronymfinder. It is a combined particle swarm optimization algorithm and monte carlo raytracing. A linear linear fresnel reflector clfr also referred to as a concentrating linear fresnel reflector is a specific type of linear fresnel reflector lfr technology. Compact linear fresnel reflector technology by cnim. The motional design and analysis for linear fresnel reflector.
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