Clearly it is possible to combine the above two approaches by varying both. Unlike traditional imaging optics, the techniques involved do not attempt to form an image of the source. Performance and cost benefits associated with nonimaging nrel. Permission is granted to copy, distribute andor modify this document under the terms of the gnu free documentation license, version 1. A wide variety of parabolic solar concentrator options are available to you, such as type, application, and pipe material. Focus, heat losses, solar concentrator, thermal efficiency, temperature. This page describes the design, construction, and operation of a troughtype parabolic solar concentrator. Rated power capacity of the single unit is about 4. Abstracta compound parabolic concentrator cpc is a well known nonimaging concentrator that will concentrate the solar radiation onto receiver pv cell. The problems related to these classical nonimaging optical elements for photovoltaics applications have been evaluated by modelling different types of linear and point focus concentrators. Heliostats are tracking mirrors that reflect solar energy onto a fixed target. Evaluation of dual combined parabolic solar concentrator in evacuated tube abid ustaoglu, junnosuke okajima,xinrongron.
In my opinion using the equation driven sketch tool is what is over complicating the problem. Meyer department of mechanical and aeronautical engineering, university of pretoria abstract solar thermal brayton cycles utilise concentrated sun rays and can be used to power microturbine generators. Compound parabolic concentrator cpc a standalone cpc is not well suited for high temperature solar concentration, because its length needs to be very high compared to its aperture diameter to achieve high concentration ratios. Building integrated compound parabolic photovoltaic. An endtoend demonstration of the workflow commonly followed when designing and analyzing optical systems in apex. Truncation equations are given, and advantages of this. In a solar cooker, for example, food is placed at the focal line. A parabolic trough is a one dimensional parabola that focuses solar energy onto a line.
In this paper ways of using compound parabolic concentrators as primary optical elements for concentrated photovoltaics are evaluated. The sunlight which enters the mirror parallel to its plane of symmetry is focused along the focal line, where objects are positioned that are intended to be heated. Renewable energy, solar heat collector, ray tracing, compound parabolic concentrator 1. The compound parabolic and simple parabolic solar collectors are analyzed and compared for their ability to accept nondirect radiation and for their respective reflector arclengths. The australian national university and wizard information systems have negotiated the terms of a licence to commercialise the big dish solar concentrator technology and is working towards construction of a demonstration plant in whyalla, south australia see the picture below. The trough has a parabolic crosssection consisting of that portion of the parabolic curve between its intersections with the latus rectum. The sg4 dish implements twoaxis tracking and may be incorporated into a disharray for largescale power production37. Design and construction of a solar collector parabolic dish. They need to be relatively precise and are expensive to fabricate and to transport. Optical performance analysis and design optimisation of. The necessity for the optical systems, in fact, is to operate at an incident angle range for the impinging radiation at which its efficiency is the highest. Development and experimental investigation of a compound.
An asymmetric compound parabolic concentrator has two different parabolic reflectors determined by their focal points and parabolic axis as shown in figure 3. The heliostat mirror system of the central tower receiver is, in principle, a special form of parabolic dish. A variety of nonimaging optical devices, similar in principle to the well known compound parabolic concentrator cpc, can be deployed in the focal zone of image. Kp performance antennas high performance parabolic antenna this proline parabolic antenna is engineered to suppress sidelobes and backlobes and are excellent at rejecting interference. Design of a parabolic trough solar collector using a concentrator with. Cpc collectors are more productive as compared to common atplate. It is widely used as a reflecting solar concentrator. Previously, polish processing was the only way possible to manufacture compound parabolic concentrators cpc. Secondary and compound concentrators parabolic dish solar. Summary the numerical simulation and experimental validation of a compound parabolic concentrator cpc are presented.
Another way to obtain costeffective, durable reflectors is to combine. Compound parabolic concentrators cpcs edmund optics. The simple parabolic concentrator spc can make use of some nondirect solar radiation if the absorber tube is intentionally enlarged so as to intercept. Building integrated compound parabolic photovoltaic concentrator. Solar tracking for a parabolic dish used in a solar. Design of a parabolic trough solar collector using a. Usually different speeds, codes, and protocols can be accommodated on the lowspeed side. Demonstration includes creation of a compound parabolic concentrator cpc in apex, defining a source, running a ray trace, and analyzing the results for the example system model. Summary currently, all compound parabolic concentrators cpcs for photovoltaic pv application consist of reflecting surfaces in the form of a.
Parabolic concentrator mirrors are an important component of many solar energy. Threedimensional compound parabolic concentrator 3d cpc was found to be more efficient than 2d cpc. Compound parabolic concentrators cpcs concentrate the maximum amount of radiation on a planar receiver consistent with the laws of thermodynamics. A photovoltaic unit utilizing parabolic trough concentrator has been realized and tested by ansaldo. Design and study of portable solar dish concentrator. Zhang, shigenao maruyama graduate school of engineering, tohoku university, sendai, 9808577, japan institute of fluid science, tohoku university, sendai, 9808577, japan department of energy and resources engineering, peking university. A distinct property that it has is that it can focus all the parallel rays from the sun to a single focus point, f as shown in figure 2.
Optical and thermal properties of compound parabolic concentrators emissivity of reflector er 0. Optical and thermal properties of compound parabolic. Optical design and characterization of solar concentrators for photovoltaics 4 ruption of the translational symmetry when the microstructured reflectors were introduced. Flat facet parabolic solar concentrator with support cell. Concentrators for these systems have traditionally been parabolic mirrors, hence the name, parabolic di sh systems. Parabola sp refers to the upper reflector and parabola rq refers to the lower reflector and their axis are at rr. Compound parabolic concentrators cpcs are designed to efficiently collect and concentrate distant light sources. The concentration ratio up to 10 can be achieved in the nontracking mode easily. Design optimisation of compound parabolic concentrator. By incorporating compound parabolic concentrators cpcs for augmenting the light collection of the. This theorem give a suff icient condition to have ete ndue limited collimation between a. Introduction compound parabolic concentrators cpcs are advanced technological solutions developed for making. A simple low cost parabolic trough made from varying. This page concentrates on providing links, information and plans for build it.
This paper presents the development of a solar parabolic dish collector. Solar concentrator, flat mirrors, recognition system 1 introduction it is possible to reduce the cost of a parabolic dish approximating the parabolic shape with a number of small flat mirrors facets. Comparison of solar concentrators ari rabl solar energy group, argonne national laboratory, argonne, il 60439, u. Particular consideration is given to the issues of manufacturability. Solar concentrators, parabolic reflectors, photovoltaic cells. An example of such design is the semi cylindrical parabolic solar concentrator. These parabolic antennas maximize the potential of your radio by improving signal strength and reducing the noise floor in your link. This device, however, has the disadvantage of having low operating efficiency and a low production rate of fresh water. The parabolic shaped mirror reflector focuses the sunlight onto a linear tube. Compound parabolic concentrators cpcs are concentrator lenses made from rotated parabolic shapes to create specific accep. Design of axisymmetrical tailored concentrators for led.
The lowspeed channels usually operate in contention and require buffering. The two dimensional design of a parabolic concentrator is equals to a parabola. Modelling of compound parabolic concentrators for photovoltaic applications efficiency are not strictly required. Nonimaging optics also called anidolic optics is the branch of optics concerned with the optimal transfer of light radiation between a source and a target.
How solar parabolic dish concentrators work the green. We have set the cpc acceptance angle such that most of the light is concentrated throughout the day, and then small adjustments of the tilt angle of the device can easily be made, perhaps weekly. Development of a compound parabolic solar concentrator to. Solar energy conversion and photoenergy systems high temperature solar concentrators robert pitzpaal figure 2. This approach was tested in 1982 in australia where 14 parabolic dishes of 20 square meters each were created 1. Steven dubowsky professor department of mechanical engineering massachusetts institute of technology cambridge, 029 ma. The collector concept was originated by winston in 1978. These concentrators do not have such strict requirements for the incidence angle as the parabolic troughs have, which makes.
It is sized so that the length of the parabolic curve is the same as the width of the available mirror material. A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror. About 33% of these are solar collector, 12% are solar energy system. Concentrating solar collectors use shaped mirrors or lens to provide higher temperatures that flat plate collectors. A comparison of compound parabolic and simple parabolic. A copy of the license is included in the section entitled gnu free documentation license. Design equations for the concentrator are derived, and it is shown that the concentrator is ideal and achieves the maximum theoretical concentration nsin. Ray tracing for optimization of compound parabolic.
Our parabolic antennas are perfectly suited for high density pointtopoint. Apart from the cpc, which can accept diffuse radiation, a concentrating collector can utilize only. Proceedings of the 2nd world congress on mechanical, chemical, and material engineering mcm16 budapest, hungary august 22 23, 2016 paper no. Design and test of nonevacuated solar collectors with. Modeling and validation of a parabolic solar techno press. Theoretical study of the compound parabolic trough solar. Optical design and characterization of solar concentrators for.
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