Creative Single Rotary Axis Solar Tracker System, France
Nexans Solar Technologies is an internal branch of Nexans, created in 2018 as part of the transition plan towards renewable energies, which aims at providing solutions, products, and services to energy producers and investors.The solar tracker from KEYLIOS® is the first solution entirely conducted by Nexans Solar Technologies, from design to manufacturing. A major contract had already been signed with a prominent developer of photovoltaic projects and an energy supplier providing more than 800 of these solar trackers to be established on four solar facilities located in the southwest of France.
|Design and Manufacture:||Nexans Solar Technologies|
Single Rotary Axis Solar Tracker Model Parameters, France
Nexans Solar Technologies' objectives are, among many other things, to contribute to the rise of solar energy in fields and areas where such resources are barely accessible due to hills too steep to build upon (for example) or foundations considered to be too expensive, even previously impossible. Old landfill sites, brownfields, and old quarries extending to hilly or unstable ground are also relevant examples. The solar tracker from KEYLIOS® revolutionizes the profitability of competitive solar facilities established in areas which had not previously been considered to be suitable for trackers due to the excessive installation cost.
Design and Features
A solar tracker maximizes the orientation of its solar panels thanks to its intuitive rotating system in order to have a higher energy yield, as opposed to fixed solar structures.
This lightweight truss structure designed by Nexans Solar Technologies allows construction in areas that were considered incompatible for traditional trackers (barely accessible areas, polluted soil, unstable ground, etc.). Deployment in remote or barely accessible areas is possible not only thanks to its pre-assembled modular design, but also thanks to its foundation system, which only requires 4 support zones, defined by two foundations for the entire structure, which can be of any type, such as bored piles or concrete blocks.
Moreover, the solidity of the structure allows operation in a wide variety of climatic conditions. It also displays a remarkable resistance to strong wind and destructive aerodynamics.
Optimization and rigorous control of production costs led to the choice of RFEM Software on which the structure of the KEYLIOS® tracker was designed.
For the purpose of meeting customer requirements and to provide a customized tracker solution, a prototype designed in RFEM was configured in order to automatically generate an end-customer model - an automated calculation process conducted according to the client's expectations.
In the basic structural model, the self-weight was entered manually on each element and the combinations involving different wind loads enabled loading decline as well as the design of components shaping the overall structure.
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"The RFEM software allowed us to accurately model the solar tracker with nonlinear calculation and the integration of very specific stiffnesses on the connections.
The RF‑STEEL EC3 add-on module, which designs the elements according to Eurocode 3, was also very useful for the optimization of the structure.
Furthermore, the extraction of various parameters of the model or of the results (forces and nodal displacements) facilitated the automation of the modeling process of the tracker and saved a considerable amount of time.
The support provided by Dlubal was a great help in the realization of this project.
Besides the rapid response to our questions, Dlubal has provided us technical solutions to improve our model."
The effects due to snow load are described in the American standard ASCE/SEI 7-16 and in Eurocode 1, Parts 1 through 3. These standards are implemented in the new RFEM 6 program and the Snow Load Wizard, which serves to facilitate the application of snow loads. In addition to this, the most recent generation of the program allows the construction site to be specified on a digital map, thus allowing the snow load zone to be imported automatically. These data are, in turn, used by the Load Wizard to simulate the effects due to the snow load.
For the joint components, it is possible to check whether the stability failure is relevant (requires the Structure Stability add-on for RFEM 6 / RSTAB 9).
In this case, the critical load factor for all analyzed load combinations and the selected number of mode shapes is calculated for the connection model. The smallest critical load factor is compared with the limit value 15 from the standard EN 1993‑1‑1, Clause 5. Furthermore, a user-defined adjustment of the limit value is possible. Moreover, the corresponding mode shapes are displayed graphically as the result of the stability analysis.
For the stability analysis, an adapted surface model is used to specifically recognize the local buckling shapes. The model of the stability analysis, including the results, can also be saved and used as a separate model file.
- Is it possible to display the deformation analysis of a surface (limit 0.5‰)?
- How do I perform stability analysis to determine the critical load factor in RFEM 6?
- How can I optimize cross-sections within the steel design?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How do I apply wind load on members of open structures?
- Is it also possible to use RF‑/TOWER Loading without the other TOWER add-on modules?
- I do not want to design a cross-section in the RF‑/STEEL EC3 add-on module. Can I quickly remove this cross-section from the selection?
- I have a roof structure resting on a steel column that runs to the foundations. The column runs through a perimeter wall that supports the false ceiling. A considerable part of the load from the roof is transferred to the wall. I want the steel column to carry all the vertical loads from the roof. How can I do it?
- Are the models and presentations from Info Day 2018 freely available, and can you send them to me?
- I encountered a sharing violation while importing a dxf file into SHAPE‑THIN. What is the issue?