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Solar Air Heater Wizard: Automating CFD Genevive Dutil & - - PowerPoint PPT Presentation
Solar Air Heater Wizard: Automating CFD Genevive Dutil & - - PowerPoint PPT Presentation
Solar Air Heater Wizard: Automating CFD Genevive Dutil & Yannick Sirois CFD ENGINEERING SIMULATION FEA Lubi TM Collector (perforated glazing) Metal backing (optional) Existing wall Lubi TM panels Spacing clips Vertical extruded bars
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LubiTM Collector (perforated glazing)
Existing wall Metal backing (optional) Spacing clips LubiTM panels Vertical extruded bars
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Goal: Tool to simulate heat transfer in wall before installation to predict and optimize efficiency
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Proposition: Automated CFD analysis from CAD to report through a GUI wizard
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Previous Process
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Design Building Measurements Design of corrective methods Building Delivery
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New Process
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Design Simulations Optimization Building Delivery
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Project Stages
- Simulation Strategy
- Simulation Model and Validation
- GUI Programming
- Optimization case
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Simulation Strategy
- Use of simple geometry elements
- Porous semi-translucent modeled as
porous baffle
- No environmental modeling
- Trimmed cell mesh
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Porous Baffle Calibration
- Detailed
simulation of a section of the perforated plate
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Simulation & Validation
- Four fully instrumented solar collectors
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CAD
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Temperature and Flow Patterns
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Mass Flow Rate & Pressure Drop Across Porous Baffle
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Simulation & Validation
- Simulation outlet temperatures and efficiency
significantly lower than the experimental values
- Environment plays an important role pre-heating
air before entering the collector
- Determination of a correction factor to the inlet
temperature influenced by: – Mass flow rate – Inlet temperature – Solar radiation incident to the collector background wall
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GUI Programming
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GUI Programming
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GUI Programming
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Optimization Case
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Single outlet, left side Junction between two sections of different length Wider plenum Side inlet
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Optimization Case
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Optimization Case
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T_in Flow rate Out T out Δη 1) Original design
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°C 13543 CFM 3.4 °C 0 % 2) Outlet centered 6.0 °C. 10.3 % 3) 2+ Blocked top inlet 5.8 °C 9.4 % 4) 2+ Inlets left side 6.4 °C 11.6 % 5) 4 + blocked top inlets 6.3 °C 11.4 % 6) 2 centered outlets + inlets on both sides 6.0 °C 10.4 % 7) 2 centered outlets + no inlets 5.9 °C 9.9 % 8) 6 + blocked top inlets 5.9 °C 9.7 %
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Optimization Case
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Benefits of GUI
- Makes CFD accessible to non-expert
users
- Optimizes wall configuration before
building
- Helps in sales: show simulation results
to client
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