These mirrors are capable of concentrating the suns energy to. Conventionally, no blowdown should take place during the test. The system uses parallel rows of mirrors lined up underneath a long, elevated. Convert linear fresnel lens to a spot fresnel lens greenpowerscience duration.
Fresnel equations encyclopedia of optical engineering. Circular fresnel reector with elliptical plate zones. The most common designs are linear fresnel reflector lfr and compact linear fresnel reflectors clfr. Linear fresnel systems and the future for concentrated. Parabolic trough linear fresnel reflectors how they work solar. Novatec solar and areva solar, the markets leading fresnel providers, share their latest technology developments. Linear fresnel collectors are a subgroup of linear concentrating collectors. 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. Mechanical and mechatronic engineering, stellenbosch university, private bag x1, matieland, 7602, south africa, phone.
Linear, as its focus is a line as opposed to a point, and fresnel as it is made of many small reflectors as opposed to a monolithic parabolic trough. Introduction the third technology to be introduced is compact linear fresnel reflector or known as concentrating linear fresnel reflector clfr. Numerous mirrors are used to absorb the solar energy and transfer it to the absorber which built correspondingly with the reflectors. Modeling linear solar collectors of the fresneltype. Compact linear fresnel reflector solar thermal powerplants article pdf available in solar energy 683. Solar concentration in italy for solar steam production prior to francia.
Underlying principle the linear fresnel reflector is made up of multiple mirrors. 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. What links here related changes upload file special pages permanent link page information wikidata item cite this page. Pdf a linear fresnel reflector as a solar system for. An array of linear narrow and long mirrors mounted on an axis which can be rotated to align to the sunlight individually. 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. This is a surface specific file depending on the secondary concentrator surface. Pdf system modelling of the compact linear fresnel reflector. In the present study, the proposed p2g plant is located near seville, south spain. Fresnel reflector synonyms, fresnel reflector pronunciation, fresnel reflector translation, english dictionary definition of fresnel reflector. Linear fresnel reflector based solar radiation concentrator. Coupling of a solidoxide cell unit and a linear fresnel. Fresnel equations 3 waves are physically identical and have the same reflectivity of about 4%.
Designed to be fit into a groove machined on the mounting surface. Compact linear fresnel reflector how is compact linear fresnel reflector abbreviated. A linear analogue of the central receiver concept, it. Compact linear fresnel reflector areva puts online us molten salt energy storage concentrated solar power csp plant it combines arevas clfr for concentrated solar power csp parks with the molten salt test loop mstl, allowing the captured energy to be dispatched both at day and night. Alternatively, a relatively new design known as the compact linear fresnel reflector clfr has been. Fresnel lens prisms that make up a fresnel lens bend and magnify light rays, creating a single, concentrated beam of light. 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. It encompasses parabolic troughs, heliostat fields, linear fresnel reflectors, parabolic. Clfr individual reflectors can have the option of directing reflected solar radiation to at least two absorbers in linear systems. The clfr solar steam generators are simple, durable, and scalable, and relatively quick to install. The classical linear fresnel system has only one linear absorber on a single linear tower, and therefore there is no choice about the direction of orientation of a given reflector. Which is the best solar thermal collection technology for electricity. Its goal is to provide highpressure steam from a system configuration that is cheaper than other designs. Linear fresnel reflectors use long, thin segments of mirrors to focus sunlight onto a fixed absorbed at a common focal point of the reflectors.
May 22, 2016 advantage of compact linear fresnel reflector fresnel system requires only the flat or lessshaped mirrors because flat mirrors are cheaper and can bent. Fresnel reflector definition of fresnel reflector by the. The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. 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. Fresnel lens with reflector trim in the 6 trim family for use in recessed downlighting. Parametric study of the small scale linear fresnel re. Pdf first results from compact linear fresnel reflector installation. The compact linear fresnel reflector is a solar thermal energy system currently at prototype stage in australia. Cnim is a specialist in the construction of complex nonfossil energy power plants waste, biomass. A linear fresnel reflector as a solar system for heating water. They use linear receivers and reflectors, which are segmented in single axis tracking heliostats. 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.
Pdf solar thermal electric plants without storage are being developed that use low cost compact linear fresnel reflector clfr solar array. 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. A fresnel lens is a flattened version of a convex lens. Fresnel system allow the developer a consideration reduction of investment compare to parabolic trough curved mirror which is more expensive and the extra cost of the solar tower. Linear fresnel reflector how is linear fresnel reflector abbreviated. Pdf compact linear fresnel reflector solar thermal powerplants.
In order to perform the optical design of mlfrc the following assumptions were made. Acceptance testing procedure for linear fresnel reflector. This product is optimally applicable to machines required for high positioning accuracy, repeatability and rigidity. Compact linear fresnel reflector technology by cnim. Solar concentration in italy for solar steam production prior to. Modelling of cavity receiver heat transfer for the compact. During 1961, clfr was invented by giovanni francia in italy. In the clfr, it is assumed that there will be many parallel linear receivers elevated on tower structures that are close enough for individual mirror rows to have the option of directing reflected solar radiation to two alternative linear receivers on. Thermal analysis of the performance of linear fresnel solar. Compact linear fresnel reflector clfr system employing multiple receivers is promising with better optical performance and cost effectiveness compared to linear fresnel reflector lfr system, especially for applications with limited ground availabilities. These systems lower cost and increase output by using absorbers that share mirrors.
Singh carried out experiments to study the temperature of the. The sunlight is further concentrated by a small linear concave mirror to the evacuatedtube absorber. The influence of ambient conditions and the percent of different types of energy loss, etc. Design and analysis of rooftop linear fresnel reflector solar concentrator k. Compact linear fresnel reflector solar thermal powerplants. Mar 25, 2014 cnim is a specialist in the construction of complex nonfossil energy power plants waste, biomass. In addition to this, the company have been working for several years on a variation of a linear fresnel concept, the compact linear fresnel reflector clfr system 34, 35. The parabolic trough shape is simulated by several flat reflectors at different positions, in order to make the sunlight reflect to the receiver tubes fixed on the top of. Design and analysis of rooftop linear fresnel reflector. 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. Lfr linear fresnel reflector solar energy acronymfinder. Linear fresnel reflector lfr everything about solar energy.
Areva puts online us molten salt energy storage concentrated solar power csp plant. The black aluminum housing is supported by a sliding yoke mount for variable balance points when. Thermal analysis of the performance of linear fresnel. Clfr compact linear fresnel reflector technology uses reflected sunlight to heat liquidfilled tubes which generate highpressure steam that produces electricity via turbines. Fresnel the tilting linear system the kimberlina solar thermal power plant with clfr technology compact linear fresnel reflector, which uses an array consisting of many parallel fresnel collectors with flat mirrors, is situated in the californian city of bakersfield in the united states. Pdf first results from compact linear fresnel reflector. 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. Pdf stage 1 of the compact linear fresnel reflector clfr, a linear concentrating solar thermal energy system at liddell power station was completed. The optimal linear fresnel reflector nn individual presents an increase of 2. Nevertheless, only few researches have been conducted to evaluate optical design and performance of the clfr system. 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. The performance of the system depends on the design parameters, mass flow rate, etc. Compact linear fresnel reflector clfr technology is, in effect, a second type of solution for the fresnel reflector field problem which has been overlooked until now.
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. A second linear concentrator technology is the linear fresnel reflector system. The following picture shows such a lighthouse fresnel lense. Compact linear fresnel reflector clfr power plant technology. The reflector segments are typically aligned horizontally and track the sun such that the receiver is. 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. A linear fresnel reflector works by utilizing the fresnel lens effect which was first developed by french physicist augustinjean fresnel. It combines arevas clfr for concentrated solar power csp parks with the molten salt test loop mstl, allowing the captured energy to be dispatched both at day and night. A compact linear fresnel reflector clfr also referred to as a concentrating linear fresnel. It is intended to be a lowcost solar thermal energy system for medium to largescale thermal energy capture. Linear fresnel reflector how is linear fresnel reflector. Alternatively, an innovative concept of compact linear fresnel reflector clfr system with multiple receivers is developed to minimize energy losses as depicted in fig. Linear concentration of solar energy by multiple flat or slightly curved surfaces basic components. 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.
All reflecting surfaces are specular and free from deformations. The compact linear fresnel reflector clfr, shown in figure 1 is a concept for a largescale solar thermal power plant. Design and analysis of rooftop linear fresnel reflector solar. Steamcircuit model for the compact linear fresnel reflector. Sanchezrodriguez a a department of electrical engineering, university of oviedo, campus of gijon, spain. 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. The principal design flaw, however, is that shading is produced from adjacent reflectors, lowering the overall output of the system. Modular linear fresnel reflecting solar concentrator. The reflector segments are typically aligned horizontally and track the sun such that the receiver is illuminated without need to be moved see fig. The movement axes of each reflector are in the same plane.
This paper evaluates compact linear fresnel reflector clfr concepts suitable for large scale solar thermal electricity generation plants. Compact linear fresnel reflector how is compact linear. The principle of this lens is the breaking of the continuous surface of a standard lens. 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 principle of this lens is the breaking of the continuous surface of a standard lens into a set of surfaces with discontinuities between them. Each reflector is pivoted at the centre of its longitudinal axis. Jan 24, 2015 compact linear fresnel reflector technology by cnim. It was developed in the early 19th century, as a way to reduce the amount of glass material needed to build a convex lens specifically for large lighthouse lenses. Different from the lfr system, one receiver is installed at each side of the solar field, which allows consecutive mirrors to redirect the sunlight to the two receivers. Linear fresnel collectors a technology overview sfera summer school 2012 june 28, 2012, almeria, spain jan fabian feldhoff email. Fresnel reflector an overview sciencedirect topics.
Compact linear fresnel reflector sun is the future. The compact linear fresnel reflector clfr is a concept for a largescale linefocus solar concentrator for use in thermal power stations. Linear fresnel systems and the future for concentrated solar. 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. Parametric study of the small scale linear fresnel reflector.
This is a discussion of the theory of linear fresnel solar concentrators, and a justification of the design decisions seized upon by the factor e farm team. Pdf compact linear fresnel reflector solar thermal. Linear fresnel solar concentrator open source ecology. 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. System modelling of the compact linear fresnel reflector. The lfr field which are comprise of 11 rows of flat mirrors can be imagined as a brokenup parabolic trough reflector by using linear segments to focus the radiation, as figure 1 shows.
Parallel mirrors at ground level focus light onto a linear radiationabsorber positioned above them. Design parameters optimization and theoretical performance. Optical design of compact linear fresnel reflector systems. In the case of parabolic reectors, the position of the feeder is. 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.
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