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

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Overview

• Refresh• Wind-Tunnel• Preliminary Model• CAD Models• Measurement Methods• CFD Progress• What’s Next

DECEMBER- 2010Design Review #2: DeLoPREC

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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

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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

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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

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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

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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