This file is licensed under the creative commons attributionshare alike 3. Convert linear fresnel lens to a spot fresnel lens greenpowerscience duration. Jan 24, 2015 compact linear fresnel reflector technology by cnim. The fresnel equations and brewsters law equipment optical bench pivot, two 1 meter optical benches, green laser at 543. The idea is to place both horn antennas at different angular positions with respect to the reflector, so we have separated the design of the system in the following steps. The reflector strips are moved in a way that they always reflect the sunlight on to the receiver tubes. The linear fresnel reflector main characteristics 2. Mahmoudi, physics group, university of qom, iran abstract. Thermal analysis of the performance of linear fresnel. Convert linear fresnel lens to a spot fresnel lens greenpowerscience. The resulting fresnel reflector concentrates 117 times the normal solar radiation onto a small point. Fresnel reflectors are long and narrow and have little to no curvature, and several receivers are connected to form a module. Linear fresnel reflector how is linear fresnel reflector abbreviated.
Stela world stecsp technologies linear fresnel reflector. Linear fresnel reflector system which was designed will produce outlet feed water temperature of 79. For example, ts is the amplitude transmission coefficient for s polarization. Linear fresnel reflector based solar radiation concentrator. Linear fresnel reflector an overview sciencedirect topics. About that time i also discovered the magic of fresnel lenses but my inability to buy any locally thwarted my budding interest.
In the case of parabolic reectors, the position of the feeder is. Tangential fields are continuous reflection and transmission coefficients the fresnel equations brewsters angle total internal reflection power reflectance and transmittance augustin fresnel 17881827. Linear fresnel reflectors use long, thin segments of mirrors to focus sunlight onto a fixed absorbed at a common focal point of the reflectors. 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. Fresnel equations consider reflection and transmission of light at dielectricdielectric boundary.
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. 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. Millimeter wave fresnelzone plate lens and antenna hristo d. Calculate reflection and transmission coefficients, r and t, as a function of incident light polarisation and angle of incidence using em boundary conditions. Basic linear fresnel reflector configuration seen from one end. The first person in modern times to apply this principle in a reasonably large system for solar collection was the italian solar pioneer giovanni francia francia, 1968 who developed both linear and twoaxis tracking fresnel reflector systems, and was thus the father of both lfr and central tower systems. Design and analysis of rooftop linear fresnel reflector solar.
Fresnel equations specify the amplitude coefficients for transmission and reflection at the interface between two transparent homogeneous media. Singh carried out experiments to study the temperature of the. In optics, the reflection of a portion of incident light at a discrete interface between two media having different refractive indices. Bancroft abstract reflection energy from a linear reflector comes from an integrant over an aperture often described by the fresnel zone. Its more than enough to burn holes in construction paper, but well be using a microwave. Linear fresnel reflector uses a single axis tracking system. Fresnel reflector definition of fresnel reflector by the. Linear fresnel reflector lfr technology sciencedirect. Fresnel reflection occurs at the airglass interfaces at the entrance and exit ends of an optical fiberresultant transmission losses, on the order of 4% per interface, can be reduced considerably by the use of indexmatching. Material and component specifications linear fresnel reflector.
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. Optical fibers only work because of total internal reflection. 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. The optimal linear fresnel reflector nn individual presents an increase of 2. It has lower optical performance and thermal output but this is offset by lower investment and operation and maintenance costs. 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. It uses flat mirrors as opposed to parabolic mirrors that are used in solar parabolic troughs. 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.
Fresnel reflector article about fresnel reflector by the. At the exit of the tubes, water and steam are separated. Progress in the design and the applications of linear. Linear fresnel reflector lfr solar power generation fig. Design and analysis of rooftop linear fresnel reflector. Dlr the first commercial fresnel power plant in europe, pe 1, was built by novatec solar ag at that time novatec biosol. Compact linear fresnel reflector and linear fresnel reflector are not proper nouns so linear and reflector should not be capitalized in the title and only fresnel should be capitalized the text. Define the lens create the parametric lens with the following steps. Inside the pipes flow water or a mixture of water and about 70% quality steam, and the operating temperature is about 500f. Linear fresnel reflector how is linear fresnel reflector. 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. Jan 10, 2012 uwe oehler has written a simple program that prints out foldup paper templates for the conic sections that make up the reflective surface of a fresnel mirror. Pe 1 is situated in murciaspain and has an electric power of 1.
Fresnel lens prisms that make up a fresnel lens bend and magnify light rays, creating a single, concentrated beam of light. Energy3d simulations of linear fresnel reflector solar power plants around the world. This product is optimally applicable to machines required for high positioning accuracy, repeatability and rigidity. Compact linear fresnel reflector solar thermal powerplants. The black aluminum housing is supported by a sliding yoke mount for variable. Fresnels equations in optics r 100% laser medium r 90% 0% reflection. Pdf a linear fresnel reflector as a solar system for. Design and analysis of rooftop linear fresnel reflector solar concentrator k. Analysis, design and fabrication of centimeterwave. The source four 7 fresnel by etc combines the classic fresnel design with efficient hpl lamp technology and advanced reflector design to offer a 750w luminaire with a lumens rating equal to other w fixtures. Thermal analysis of the performance of linear fresnel solar. Even the relatively simple, five ring, 59% coverage reflector shown in the video.
Cut the templates out of cardboard, cover the cardboard with aluminum tape, fold up the sections, and apply them to a flat backing. 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. A linear fresnel reflector is another type of solar power collector. Linear fresnel reflector systems for solar radiation. In figure 2, the sunlight irradiates to the center of mirror at space vector of elevation angle and azimuth angle.
In this paper we report design and fabrication of a half and quarter wave. The basic principle remains the same with the mirrors collecting solar power which is then utilized to generate steam which in turn drives a turbine. Fresnel reflection article about fresnel reflection by. Compact linear fresnel reflector clfr power plant technology. A fresnel lens is a flattened version of a convex lens. This concept at nonoptical wavelengths is also applicable. Consider light intersecting the plane interface between two materials, numbered 1 and 2, with an incident electric field e i, a reflected electric field e r, and a transmitted electric field e t. 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. Pdf application of linear fresnel reflectors for feed. Linear fresnel collectors a technology overview sfera summer school 2012 june 28, 2012, almeria, spain jan fabian feldhoff email.
Once i reached university i started playing around with solar. Linear fresnel reflector lfr solar mirrors are analogues of the parabolic trough mirror, just as central receiver heliostats are analogues of parabolic dish collectors. The lens does not consist of a single polished piece of glass with spherical or other surfaces. Fresnel lens a complex compound lens used in lighthouse and signal beacons. 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. Each fullwave zone of the lens is divided into four quarterwave subzones. Jan 09, 2012 the resulting fresnel reflector concentrates 117 times the normal solar radiation onto a small point. 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. Analysis, design and fabrication of centimeterwave dielectric fresnel zone plate lens and reflector a. These mirrors are capable of concentrating the suns energy to. Pdf application of linear fresnel reflectors for feed water. The fresnel system also provides a semi shaded space, which may be particularly useful in desert climates for agriculture.
Amplitude within the fresnel zone for the zerooffset case. 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. Fresnel reflection occurs at the air glass interfaces at the entrance and exit ends of an optical fiber. The angle between mirror and horizontal axis direction is, and the location position of reflected rays on collector tubes is if the mirror rotation center is located on the center of mirror. Save the project by selecting file save as from the main menu, naming the project fresnel lens. A fresnel lens uses the crosssections of the curvature of a convex lens, but flattens them onto planar surface. Amplitude within the fresnel zone crewes research report s volume 14 2002 amplitude within the fresnel zone for the zerooffset case shuang sun and john c. 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.
The strong relationships between these two antennas are discussed. Beginner tutorial 4 designing a fresnel lens with the. Easy flatpack fresnel reflector as a child i enjoyed playing with the power of the sun, wreaking havoc on my plastic soldiers with a magnifying glass. Compact linear fresnel reflector technology by cnim. Circular fresnel reector with elliptical plate zones. Mar 28, 2018 energy3d simulations of linear fresnel reflector solar power plants around the world. It is shown that many of the limitations of reflectarrays and possible methods for improvement are strongly related with the theory of fresnel zone antennas. Designed to be fit into a groove machined on the mounting surface. The transmission and reflection coefficients are functions of the angle of incidence and the polarization of the incident light. 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.
Many lasers use brewsters angle components to avoid reflective losses. Even the relatively simple, five ring, 59% coverage reflector shown in the video will burn holes in. Fresnel lens with reflector trim in the 6 trim family for use in recessed downlighting. A linear fresnel reflector as a solar system for heating water. 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. Fresnel reflector synonyms, fresnel reflector pronunciation, fresnel reflector translation, english dictionary definition of fresnel reflector. Herben, senior member, ieee abstracta new variety of millimeterwave fresnelzone plate lens with enhanced focusing quality is described. Computer simulation of linear fresnel reflectors youtube. A second linear concentrator technology is the linear fresnel reflector system. The booklet is intended to serve as a guide for stakeholders interested in con.
Zoom out by right clicking your mouse and selecting zooming zoom out or just click on the zoom out button on the toolbar. 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. The 7 fresnel renders a very even beam output with a 20 65 spottoflood range. Spec sheets e26 6 inch trim series 173p 173ps fresnel lens with reflector. 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. Fresnel equations formulas that relate the amplitude, phase, and state of polarization of reflected and. The fresnel design uses less expensive reflector materials and absorber components.