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P.V. Panel wind load effects

TEAM 12. P.V. Panel wind load effects. In-Class Presentation. March 2011. Arman Hemmati , Brady Zaiser , Chaneel Park, Jeff Symons, Katie Olver. Introduction – Problem. Most efficient sun capture at 51° Higher angle means greater aerodynamic forces

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P.V. Panel wind load effects

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  1. TEAM 12 P.V. Panel wind load effects In-Class Presentation March 2011 Arman Hemmati , Brady Zaiser, Chaneel Park, Jeff Symons, Katie Olver

  2. Introduction – Problem • Most efficient sun capture at 51° • Higher angle means greater aerodynamic forces • Ballast required to hold the panel down • Too much weight for the roof? • Want to better understand wind loads on PV panels: • Wind Tunnel Testing • Computational (CFD) Analysis

  3. Objectives – Functional Requirements • Effect of Wind Direction • Front or back • Effect of Panel Tilt • Preferred angle is 51° • Proximity of Panel to the Ground • Should reduce drag to a point

  4. Wind Tunnel – Test Apparatus

  5. Wind Tunnel – Testing Parameters • Wind direction • How does the force on the panel change depending on the wind direction? • Front, back • 2 levels

  6. Wind Tunnel – Testing Parameters • Panel angle • How does the force on the panel change as the angle increases? • In Calgary the ideal angle is 51° • Testing at: • 35°, 50°, 65° and 80° • 4 levels

  7. Wind Tunnel – Testing Parameters • Panel height • How does the force on the panel change as the distance between the ground and the bottom of the panel increases? • Unable to use CFD for this • Testing at: • 0, 1”, 2”, …, 6” • 7 levels

  8. Wind Tunnel – Testing Procedure • How many runs? • 2∙4∙7 = 56 runs per replication • 2 replications = 112 runs • Randomize run order • Lots of set-up between runs • How long will it take? • 5 min/run + daily set-up • Estimate 15 hours  1 week

  9. Computational Fluid Dynamics • 2D Simulations • Using ComsolMultiphysics and Ansys CFX

  10. CFD - Verification • Results recorded in ratios (CL, CD, CP) • Vertical Flat Plate • Reference: “On the Flow of Air Behind an Inclined Flat Plate of Infinite Span” -Fage and Johansen, 1927.

  11. www.ucalgary.ca/deloprec

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