| Autor: |
Yuri V. Ascheulov, Viacheslav M. Andreev, Sergei O. Kognovitski, Viacheslav A. Linnas, Yuri S. Chumakov, Alexander V. Chekalin |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| Popis: |
In the current work we conducted a comparative analysis of aerodynamic properties of four different types of dual axis solar trackers. The types of trackers were the following: flat, where all modules are arranged in the same plane; stair-step where modules are positioned in stair-step like pattern; modified flat, which is similar to flat but with some rows of modules offset relative to the base plane; linear, which is low profile design where all modules rotates around main axis and each row of modules rotates around its own secondary axis. Drag force was chosen as the principal criteria for determination of the aerodynamics efficiency of the models listed above. Also another parameter called drag coefficient (Cx) was used to calculate drag forces acting on the actual trackers with module surface area equal to 36m2. The measurements were carried out using a wind tunnel with an open-jet working section of 2 m in diameter and 3 m in length. The scale of the models was chosen to be 1:15. The air stream velocity was varied between 3 m/s and 12 m/s. The measurements were carried out for the least favorable operating positions of the trackers. Obtained drag values for the given models allowed us to talk about advantages and disadvantages of certain solar tracker designs. Obtained data provides necessary information for the tracker optimization. It was shown that wind loads on tracker designs with minimized midsection area and the lowest values of drag coefficient (like the linear and stair-step like designs) can be significantly lower, up to 30 %, compared to the traditional CPV systems of the flat type. The obtained results allow us to conclude significant increase in lifespan for the trackers built using the design of models of stair-step and linear design. These types of trackers allow obtaining the maximum power output during times with unfavorable wind conditions.In the current work we conducted a comparative analysis of aerodynamic properties of four different types of dual axis solar trackers. The types of trackers were the following: flat, where all modules are arranged in the same plane; stair-step where modules are positioned in stair-step like pattern; modified flat, which is similar to flat but with some rows of modules offset relative to the base plane; linear, which is low profile design where all modules rotates around main axis and each row of modules rotates around its own secondary axis. Drag force was chosen as the principal criteria for determination of the aerodynamics efficiency of the models listed above. Also another parameter called drag coefficient (Cx) was used to calculate drag forces acting on the actual trackers with module surface area equal to 36m2. The measurements were carried out using a wind tunnel with an open-jet working section of 2 m in diameter and 3 m in length. The scale of the models was chosen to be 1:15. The air stream velo... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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