Receiver heat transfer for the compact linear fresnel reflector, anzses. Fresnel reflector synonyms, fresnel reflector pronunciation, fresnel reflector translation, english dictionary definition of fresnel reflector. Linear fresnel reflector an overview sciencedirect topics. Learn about the advantages of our lf11 fresnel collector for solar process heat and direct steam generation.
Linear concentration of solar energy by multiple flat or slightly curved surfaces basic components. These systems lower cost and increase output by using absorbers that share mirrors. The linear fresnel concentrators have less thermal efficiency compared to other types of solar concentrators, but the low cost of the lfr may compensate that, providing a solution to the cost problems of solar energy collectors on a large scale 1. This paper presents the new linear fresnel technology performance model in nrels system advisor model.
Cnim is a specialist in the construction of complex nonfossil energy power plants waste, biomass. Linear fresnel collectors a technology overview sfera summer school 2012 june 28, 2012, almeria, spain jan fabian feldhoff email. A linear fresnel reflector power plant uses a series of long, narrow, shallowcurvature or even flat mirrors to focus light onto one or more linear receivers positioned above the mirrors. Though ptc is a more mature and widely applied technology. This page concentrates on providing links, information and plans for build it yourself concentrating collectors and heliostats. The solar collectors were produced at the ausra factory in las vegas. Material and component specifications linear fresnel reflector. Pdf a comparative study between parabolic trough collector.
Optical characteristics of linear fresnel collectors lfc. Based on the focus geometry, concentrating solar collectors are classified into parabolic tough concentrator ptc, solar tower concentrator stc, parabolic dish and linear fresnel reflector lfr concentrator. Linear fresnel collectors have the potential to reduce levelized costs of electricity lcoe of solar thermal power and thus accelerate the market penetration of solar thermal power plants. Fresnel lens prisms that make up a fresnel lens bend and magnify light rays, creating a single, concentrated beam of light. Stela world stecsp technologies linear fresnel reflector. Linear concentrating solar power csp collectors capture the suns energy with large mirrors that reflect and focus the sunlight onto a linear receiver tube. Theoretical elements for the design of a small scale linear fresnel.
Linear fresnel reflectors lfrs approximate the parabolic shape of a traditional trough collector with long, groundlevel rows of flat or slightly curved reflectors that reflect the solar rays up onto an overhead linear receiver. Here you can learn about a new solar technology developed by suberia systems that uses linear fresnel reflectors. They use linear receivers and reflectors, which are segmented in single axis tracking heliostats. 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. However, in this case, the parabolic shape is achieved by almost flat linear facets. 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. Thermal and optical efficiency analysis of the linear fresnel. On top of the receiver, a small parabolic mirror can be attached for further focusing the light. 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. Many possible configurations for fresnel collectors are found in the literature 6. These reflectors use the fresnel lens effect, which allows for a concentrating mirror with a large aperture and short focal length. A typical lfr uses modular, flat mirrors that track the sun. Table 2 shows the design characteristics of th e design and thermal performances of semiparabolic linear fresnel reflector solar concentration. The fresnel collector system has been designed with sufficient flexibility.
The main objective of this study is the investigation of the effect of the optical path of incident beam solar radiation on the performance of a linear fresnel concentrating solar collector. Pdf a linear fresnel reflector as a solar system for. The advantages of linear concentrating fresnel collectors include relatively simple construction, low wind loads, a stationary receiver and high ground usage 2. A solar tracking mirror mechanism to system was added. Concentrating collectors are divided into singleaxis tracking collectors and twoaxes tracking collectors reference 1. Continued from part 4 this is a series of articles on the various technologies that can be employed to trap the suns energy. The production of electricity from solar radiation is a direct process. The solar thermal element can be a parabolic trough field, a linear fresnel reflector field, a central receiver system or a field of parabolic dishes, commonly designed for a normal incident radiation of 800900 wm2 1. Thermal analysis of a receiver for linear fresnel reflectors. The fresnel reflectors concentrate beam radiation to a stationary receiver. Built upon the process heat collectors state of the art report developed within ieashc task 33 5 and complementing the information on technologies and available products therein presented, the current report presents a basic description of thermal enhancement strategies.
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. Acceptance testing procedure for linear fresnel reflector solar. Comparison of linear fresnel and parabolic trough collector power plantsq gabriel morina,1,ju. Parabolic solar trough concentrators and a linear fresnel concentrators are similar. Steadystate thermal analysis of an innovative receiver for linear. The thermal performance of fresnel solar collector for different operating conditions was obtained. When scaled down, the linear fresnel reflectors meet the medium temperature ranges 100oc. Linear fresnel systems and the future for concentrated. Singh carried out experiments to study the temperature of the. Thermal analysis of the performance of linear fresnel. However, the pivotal attempt to employ it for large linear system for solar collection was developed both linear and two axis tracking fresnel reflector systems 7. A comparative study between parabolic trough collector and. Underlying principle the linear fresnel reflector is made up of multiple mirrors. Fresnel reflector definition of fresnel reflector by the.
Linear fresnel systems and the future for concentrated solar. Mechanical and mechatronic engineering, stellenbosch university, private bag x1, matieland, 7602, south africa, phone. Concentrating collector an overview sciencedirect topics. In this case, two axes tracking of the sun is done to allow both seasonal and daily solar movement, the axes are normally either tip tilt or azimuth altitude. The linear fresnel solar collector is an attractive alternative. Design and analysis of rooftop linear fresnel reflector solar concentrator k. Steadystate thermal analysis of an innovative receiver for linear fresnel reflectors r. Performance analysis of the solar linear fresnel reflector. In april 2008, areva opened a large factory in las vegas, nevada to produce linear fresnel reflectors. Results and comparison from the sam linear fresnel.
Optical design of compact linear fresnel reflector systems. Linear fresnel collectors are a subgroup of linear concentrating collectors. This gap is being filled by systems which use linear instead of circular focusing. In linear fresnel concentrators, the solar radiation is reflected and concentrated by a field of fresnel mirrors into a receiver.
Progress in the design and the applications of linear. Analysis of potential use of linear fresnel collector for direct. Pdf a comparative study between parabolic trough collector and. Results and comparison from the sam linear fresnel technology. The design of linear fresnel solar collectors lfsc follows the principle of the fresnel. Parabolic trough collectors ptcs and linear fresnel reflectors lfrs could range in peak capacity from 1 mwth to several hundred mwth.
Design and analysis of rooftop linear fresnel reflector. Design and analysis of rooftop linear fresnel reflector solar. The collector assembly and components are modeled using pro e package. Linear fresnel collectors were developed for large scale solar thermal power generation that results in thermal capacities of at least several tens and up to many hundreds of mw. There are different designs for solar power collectors that are currently being used to generate electricity, like parabolic trough, parabolic dish, solar tower and linear fresnel collectors. In the case of solar collectors with parabolic reflectors, this condition is achieved when the reflectors track the movement of the sun during daytime. The receiver contains a fluid that is heated by the sunlight and then used to heat a traditional power cycle that spins a turbine that drives a generator to produce electricity. Concentrating solar collectors use shaped mirrors or lens to provide higher temperatures that flat plate collectors. Compact linear fresnel reflector technology by cnim. In ground installations, it minimizes the use of land and the cost of site works for. Comparison of linear fresnel and parabolic trough collector. The linear fresnel collector concept uses a number of rows of relatively small oneaxis tracking mirrors that concentrate the radiation on a linear receiver. Parabolic trough and concentrating linear fresnel reflectors are classified as linear focus collector types. The reflector is rotated to track the suns movement, and its.
This is done to achieve maximum annual beam radiation with a high. 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. Design of a parabolic trough solar collector using a. In the case of solar collectors with parabolic reflectors, this condition is achieved. Heliostats are tracking mirrors that reflect solar energy onto a fixed target. The most common designs are linear fresnel reflector lfr and compact linear fresnel reflectors clfr. Theoretical and experimental study article pdf available in case studies in thermal engineering 8 july 2016 with 871 reads. Solar thermal powerelectric generation systems collect and concentrate sunlight to produce the high temperature heat needed to generate electricity. Thermal analysis of the performance of linear fresnel solar. A linear fresnel reflector as a solar system for heating water. Analytic optical design of a linear fresnel solar collector journal of. An easy to make tool for drawing parabolas as used in concentrating collectors. All solar thermal power systems have solar energy collectors with two main components.
Thermal and optical efficiency analysis of the linear fresnel concentrator compound parabolic collector receiver. A comparative study between parabolic trough collector and linear fresnel reflector technologies article pdf available in energy procedia 6. Pdf a linear fresnel reflector as a solar system for heating water. Steadystate thermal analysis of an innovative receiver for. The advantages of fresnel linear concentrations include. The main fact that limits the concentration factor is the drift. Linear fresnel reflector lfr systems are similar to parabolic trough systems in that mirrors reflectors concentrate sunlight onto a receiver located above the mirrors.
Mar 25, 2014 cnim is a specialist in the construction of complex nonfossil energy power plants waste, biomass. Linear focus collectors achieve medium concentration 50 suns and over, and point focus collectors achieve high concentration over 500 suns. Simulation of a linear fresnel solar collector concentrator. In this study, linear fresnel collector system is investigated experimentally. 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. According to this geometrical principle, ptcs and lfrs have been using parabolic mirrors since the beginning of their operations 3,6.
Since the fresnel reflectors reflect the sun beam radiation on a stationary linear receiver, it needs a single axis tracking system to keep these mirrors focusing radiation on the linear receiver 4. The linear fresnel reflector lfr technology is of growing interest. There is a gap in the market between nonconcentrating rooftop collectors used for solar heating and large scale systems used for bulk electricity generation. Fresnel reflector an overview sciencedirect topics. Design, manufacturing and characterization of linear fresnel. 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. Recent developments have focused on smaller units to supplement thermal power stations and to provide heat for industrial processes. A stirling solar dish, or dish engine system, consists of a standalone parabolic reflector that concentrates light onto a receiver positioned at the reflectors focal point.
It is expected that linear fresnel collectors will be cheaper than conventional parabolic trough collectors, however the efficiency of this new collector. Collectors based on the linear fresnel reflector design are leading the pack. A second linear concentrator technology is the linear fresnel reflector system. This is the first commercial linear fresnel reflector plant in the united states.
It uses flat mirrors as opposed to parabolic mirrors that are used in. The linear fresnel reflector main characteristics 2. The radiation is reflected and concentrated onto fixed linear receivers mounted over the mirrors, combined or not with secondary concentrators. In the last four decades, in terms of concentrated solar power plants, ptc has been leading the energy production and the number of facilities installed over lfr 3. Concentrating linear fresnel reflectors can be used in either large or more compact plants. The design of linear fresnel solar collectors lfsc follows the principle of the fresnel lens, which is developed by the french physist augustinjean fresnel. Its light structure, compact dimensions and innovative design make it an ideal rooftop solution. Linear fresnel reflectors lfr are also based on solar collector rows or loops. Flt linear fresnel collector manufacturer soltigua. Thermal analysis of a linear fresnel lens solar collector with black body cavity receiver 107 the lens considered in this study is a flat nonimaging fresnel lens fig. 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.
Linear fresnel collectors were developed for large scale solar thermal power generation that results in. However, one fundamental difficulty with the lfr technology is the avoidance of shading of the incoming solar radiation and blocking of the reflected solar radiation by adjacent reflectors. A linear fresnel reflector is another type of solar power collector. Introduction linear fresnel reflector lfr is a linefocusing system. In addition, it is useful for both thermal and electrical applications. Linear fresnel collectors a technology overview sfera. This system offers a lower cost solution as the absorber row is shared among several rows of mirrors. 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 principal design flaw, however, is that shading is produced from adjacent reflectors, lowering the overall output of the system. Design and analysis of a highefficiency, costeffective. A comparative study between parabolic trough collector and linear fresnel reflector technologies. Like in parabolic troughs, the reflecting material is silver.
Haberle 2002, novatec solar, ausra the mirrors in the realized linear fresnel collectors are made of flat mirror stripes, which receive a small curvature by mechanical bending. The lens is manufactured of polycarbonate, which is high temperature resistant, and has a. The former is made from a plastic material and shaped in the way shown to focus the solar rays to a point receiver, whereas the latter relies on an array of linear mirror strips that. Jun 14, 2016 learn about the advantages of our lf11 fresnel collector for solar process heat and direct steam generation. Concentrated solar power systems have until recently focused on bulk electricity production, with the main focus on solar towers and trough type collectors. Solar thermal energy ste is a form of energy and a technology for harnessing solar energy to generate thermal energy or electrical energy for use in industry, and in the residential and commercial sectors. This tracking has been designed to maximize the reception of available solar radiation. Linear fresnel systems, which are a type of linear concentrator, are active in germany, spain, australia, india, and the united states. The advantages of linear concentrating fresnel collectors include relatively simple construction, low wind. Linear fresnel reflector lfr tubular 1040 60250 parabolic trough collector ptc tubular 1545 60300 cylindrical trough collector ctc tubular 1050 60300 twoaxes. The requirements regarding the kinematics of the reflectors are examined, allowing the effective focus of the reflected radiation on the receiver cover. 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. Solar energy is not very dense, it is necessary to concentrate it to produce exploitable temperatures usable for the production of electricity. The parabolic trough collectors ptc consist of solar collectors mirrors, heat receivers and support structures.
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