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Analysis Introductions Pier Angelo Favarelo Zumtobel Ruben Bons - - PowerPoint PPT Presentation
Analysis Introductions Pier Angelo Favarelo Zumtobel Ruben Bons - - PowerPoint PPT Presentation
Thermal Simulation of LED- Powered Luminaire With Coupled Electrical Circuit Analysis Introductions Pier Angelo Favarelo Zumtobel Ruben Bons Director, Electronics LED Context The LED Thermal-Electrical Challenge The LED Thermal-Electrical
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LED Context
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The LED Thermal-Electrical Challenge
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The LED Thermal-Electrical Challenge
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The LED Thermal-Electrical Challenge
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The LED Thermal-Electrical Challenge
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The LED Thermal-Electrical Challenge
LED in series LED in parallel
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The Core Problem for LED Simulation
Electrical simulation: ngspice Flow/Thermal simulation: STAR-CCM+
If, Vf, Efficiency → Q LED temperature
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LED Luminaire: Test Configuration
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LED Luminaire: STAR-CCM+ Model
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LED Luminaire: STAR-CCM+ Model
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STAR-CCM+ Model Overview
Flow
– Modeled as a luminaire attached to an aluminum bar (heat sink) and sitting on a wood block. – In a box (270 mm x 190 mm) with the ends open to the ambient – Laminar – Natural convection (air using the ideal gas law) – Steady-state – Segregated flow & energy solvers – ½ symmetry model used
Thermal
– Ambient air temperature = 298 K (24.85 °C). – LED heat dissipation is calculated by ngspice (as a fraction of If * Vf).
Mesh
– Conformal polyhedral – Utilized extrusions at the walls.
Solver settings
– Segregated flow & energy – Under-relaxation
- Fluid energy UR = 0.99
- Solid energy UR = 0.9999
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STAR-CCM+ Model: Mesh
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STAR-CCM+ Model: Mesh
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Video Demonstration: Coupled Simulation Process
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STAR-CCM+ Model: Sample Results
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STAR-CCM+ Model: Sample Results
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STAR-CCM+ Model: Sample Results
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STAR-CCM+ Model: Sample Results
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