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P.V. PANEL WIND LOAD EFFECTS
DECEMBER 2010
Arman Hemmati , Brady Zaiser, Chaneel Park, Jeff Symons, Katie Olver
Design Review #2
DECEMBER- 2010Design Review #2: DeLoPREC
2
Overview
• Refresh• Wind-Tunnel• Preliminary Model• CAD Models• Measurement Methods• CFD Progress• What’s Next
DECEMBER- 2010Design Review #2: DeLoPREC
3
Refresh – Where were we?
• Ideal angle of inclination is 51°
• Too much weight for the roof?
• Wind-Tunnel testing – Experimental
• Computational Fluid Dynamics (CFD) - Computational
DECEMBER- 2010Design Review #2: DeLoPREC
4
Wind Tunnel – Spec. & Set-backs
• Wind tunnel dimensions:
Target area = 20% (total area)
• Set-Backs:
• Unsure about the state of the Wind Tunnel – Speculations say it is functional now!
• Wind Speed – Hard to obtain (Repeatability Issue)
• Availability of the Tunnel – Time conflict with other groups
20%
137.2 cm
76.2
cm
DECEMBER- 2010Design Review #2: DeLoPREC
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Preliminary Model – Design
1. Complex MDoF Model
Adapted for Final Concept
2. 4-Leg Spider Model
Non-Repeatable & High errors
DECEMBER- 2010Design Review #2: DeLoPREC
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Preliminary Model – Design
3. Basic Hinge Model
Simple/Cheap/ Repeatable | Poor
4. Screw-Bolt MDoF Model
DECEMBER- 2010Design Review #2: DeLoPREC
7
CAD Models – SolidWorks
• Screw-Bolt Multi-DoF Model created in SolidWorks
DECEMBER- 2010Design Review #2: DeLoPREC
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Measurement Methods
1. Drag-Plate / Load Cells: • One directional force measurement• Only measures at a specific location
2. Pressure Taps: • Informed it is hard to set-up• Easy data acquisition / problematic analysis• Good Accuracy
3. ATI 6-Axis Force Transducer: • Budget Constrains: Delivery time / COST • Highly Accurate | Problematic Calibration
DECEMBER- 2010Design Review #2: DeLoPREC
9
CFD Progress – 2D Modeling
• COMSOL Model:
o Geometry – full size panel & 2Do Simple Physics – Laminar flow to begino Complex system – Turbulent / Time-dependent
• Boundary Layer Issues – Top/Bottom/Outlet
• Convergence Issues
DECEMBER- 2010Design Review #2: DeLoPREC
10
What’s Next – Where are we going?• Building the Experimental Model
• Planning the Wind-Tunnel Schedule
• Familiarizing with the Acquisition programs (Labview)
• Proceeding with the CFD Models
DECEMBER- 2010Design Review #2: DeLoPREC
www.ucalgary.ca/deloprec