Sunntics provides a detailed design of the solar field, including the heliostat field, the solar receiver and the dimensioning of other key components interacting with it, including thermal storage. Unfortunately, obtaining an optimal field requires facing a complex nonconvex, continuous, largescale, and constrained optimization problem. Segal solar optics design and mathematical modeling unit, weizmann institute of science, israel with contribution of e. The model, described and validated herein, includes a detailed calculation of the annual average optical efficiency accounting for cosine losses, shading and blocking, aberration and atmospheric attenuation. Because the computational time is reduced significantly, the presented implementation is sufficiently fast to allow for heliostat field layout optimization within a couple of hours. Because the optimization of the distance between foreandaft two rows of heliostat is avoided, the computer time is reduced effectively. Optimum layout of heliostat field when the towertop receiver is provided with secondary concentrators a.
Optical efficiencies of a heliostat field do not change uniformly with the. Robert pitzpaal, nicolas bayer botero, aldo steinfeldheliostat field layout optimization for hightemperature solar thermochemical processingsolar energy, volume 85. Global optimization of solar power tower systems using a monte. Using this procedure the heliostat field of a 1mwe solar tower power plant was designed. Design of a parallel genetic algorithm for continuous and. Optimization of a heliostat field is an essential task to make a solar central receiver system effective because major optical losses are associated with the heliostat fields. During the field optimization heliostats are repositioned without or with little restrictions. In particular, we obtain a very simple and exact expression of the maximal energy collectable by the solar field and present effective strategies to reach such maximum. Querod adepartment of statistics and operations research, university of seville, spain bmathematics institute of the university of seville, spain cdepartment of partial equations and numerical analysis, university of seville, spain. A new computationally e cient model and biomimetic layout corey j.
Optimization of heliostat field layout in solar central. Heliostat field layout using nonrestricted optimization. The heliostat field of solar power tower plants can suppose up to 50% of investment costs and 40% of energy loss. Concentrating solar power csp plants unleash the power of the sun for lowcost, fossilfuel free energy generation.
Optimisation of heliostat field layout for solar power tower systems using. In this study, iterative artificial bee colony algorithm iabca methodology was proposed to perform optimization of a heliostat field for solar power tower spt system. A complete mathematical code was developed for this purpose, which generates a heliostat field and calculates the optimum spacing between heliostats through differential evolution optimization. Improved heliostat field design for solar tower plants. Rose pattern for heliostat field optimization with a. As a result of the intended purpose of optimization of heliostat field.
Additionally, optimization of heliostat canting, is presented as an application of the heliostat layout optimization model. In this way, the blocking and cosine losses are lowered. Heliostat field layout optimization offers a great opportunity to improve field. Optimization of central receiver concentrated solar. Optimization of a heliostat field layout on annual basis.
Development of a mathematical model for optimizing a. The model, described and validated herein, includes a detailed calculation of the. Optimization methodology for solar tower cavity receivers with molten. Starting in the 70s heliostat field layout optimization is an area of ongoing research where multiple techniques have been studied each with varying degrees of accuracy and computational speed 9, 12. This method is used for layout and optimization of heliostat fields of central receiver systems. We also provide an optimised operation strategy to maximise the energy transformation ratio. Pdf heliostat field layout optimization with evolutionary algorithms. Farfield optimisation of heliostat shape and spacings. A novel methodology for the design of heliostat fields is presented, based on the selection of heliostats from an oversized field by means of a polygon. While technical development mainly takes place in the. Optimization of solar tower molten salt cavity receivers for.
Department of mechanical and mechatronic engineering, university of stellenbosch, private bag x1, matieland 7602, south africa. In this study, differential evolution was employed to perform optimization of a heliostat field. Section 2 describes works related to the heliostats field optimisation. Pdf the exploitation of solar power for energy supply is of increasing importance.
Using the site selection model, suitable sites are located based on heliostat field efficiency and average annual insolation. Therefore, it must be carefully optimized when designing a scrs power facility. Pdf in this study, iterative artificial bee colony algorithm iabca methodology was proposed to perform optimization of a heliostat field for. Individual mirrors, called heliostats, track the movement of the sun to reflect its rays onto a central receiver. The target may be a physical object, distant from the heliostat, or a direction in space. He then demonstrates that common methods of heliostat field layout optimization can be improved upon by performing what he calls the free variable method of heliostat field layout optimization. Every point in the field is evaluated to find the best position for one heliostat to be placed. In heliostat fields, lutchman demonstrates, firstly, a heliostat field analysis method based on foundational principles of geometry and optics. Re re project overview introduction heliostat cost reduction opportunities our heliostat design the reflector module the heliostat frame and base the field layout control system targeting requirements sensing and control system wind mitigation conclusions acknowledgements introduction. Pdf optimization of heliostat field layout for solar power tower. In this study, a mathematical model was developed to effectively optimize the heliostat field on annual basis using differential evolution, which is an evolutionary.
The optimization of the heliostat field was achieved using the solarpilot algorithm for determining the optimal heliostat positions, tower height, receiver height, and receiver aspect ratio. Pdf heuristic knowledgebased heliostat field control. The field growth method the field growth method of heliostat field optimization starts with an empty field. However, with the ever increasing cost of fossil fuels and natural gas, power generation with higher efficiency and lower capital cost is in high demand. Multiobjective optimization of solar tower heliostat fields. This necessity has resulted in continuous research on heliostat fields.
A new heliostat field optimization method is presented. Optimisation of heliostat field layout for solar power tower. Pdf spillage estimation in a heliostats field for solar. The heliostat field studied in this article is simulated in qinghai, china. Ps10 heliostat field is redesigned using the optimization tool. Optimization procedure for design of heliostat field.
A heuristic method for simultaneous tower and patternfree. Heliostat field optimization can be done in at least three different ways. On using a gradientbased method for heliostat field. Hierarchical raytracing method the rays have their origin in the sun, hit the surface of a heliostat and are re. Heliostat field design for solar thermochemical processes. Electricity has an essential role in our daily life. Optimizing the heliostat field layout by applying stochastic.
Heliostat field optimization is generally performed by using. In this thesis, two new models are introduced for the purposes of i locating sites in hillside terrain suitable for central receiver solar thermal plants and ii optimization of heliostat field layouts for any terrain. The results also indicate the optimization of heliostat field layout for 2650 sener heliostat, which considered as a reference in this work, by using the scarce open literature data. Towards high efficiency heliostat fields aip publishing. Hflcal is a program for layout and optimization of heliostat fields of central receiver systems crs based on annual performance calculation. Zeus, karlsruhe, germany, february 21 22, 20 1 pdf datei 2 s. An optimization approach to the design of multisize.
Optimum layout of heliostat field when the towertop. Heliostat field design for solar thermochemical processes robert pitzpaal dlr solar research based on. For this reason, among others, heliostat field optimization remains an active research field. However, since the pods have only been used relatively recently there is less development in optimization techniques to design heliostat pod fields.
Spillage estimation in a heliostats field for solar field optimization. Since the heliostat field contributes significantly to the overall cost of the plant it is highly beneficial to ensure that the field layout is the most optimal at collecting energy from the sun. A heliostat from helios, the greek word for sun, and stat, as in stationary is a device that includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the suns apparent motions in the sky. Get pdf 428 kb abstract hflcal is a program for layout and optimization of heliostat fields of central receiver systems crs based on annual performance calculation. Heliostat field solar tower renewable energy sunntics. A heuristic method for simultaneous tower and patternfree eld optimization on solar power systems e. To obtain the ideal field shape, the polygon vertices are optimized with an evolutionary algorithm. Although patternbased layouts and iterative deployment are popular heuristics to simplify the problem, they limit flexibility and might. The method is intended for the further performance improvement after initial layout with a standard heliostat field layout tool. Optimization of a helios tat field layout using hybrid psoga algorithm. Introduction solar systems need large dedicated areas. Far field optimisation of heliostat shape and spacings clotilde corsi, victor grigoriev, manuel blanco csiro energy centre, 10 murray dwyer circuit, mayfield west, nsw 2304, australia email. Pdf thermoeconomic optimization of hybrid combined.
Pdf optimization of heliostat field layout for solar. An optimization approach to the design of multisize heliostat fields e. Heliostat field layout optimization with evolutionary algorithms richter et al. In this article, a new model and a biomimetic pattern for heliostat field layout optimization are introduced. Heliostat field layout optimization with evolutionary. Heliostat field layout optimization for a central receiver. A users manual for delsol3, sandia national laboratories, california. Multiobjective optimization of solar tower heliostat. A solar tower power plant is composed of the heliostat field, receiver part.
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