Finding the Optimal Tilt Angle Olindo Isabella PVMD Delft University of Technology
Introduction DNI·cos(AOI) f(SVF, AOI, DHI) G Module GHI · a · (1-SVF) f( tilt , azimuth ) θ M
Learning objectives 1. Solar irradiance 2. Sun movement 3. Tilt angle 1. Calculating irradiance based on tilt angle 2. Finding the optimal tilt and azimuth angles • Optimization flowchart Fixed and adjustable concepts • 3. Mechanical tracking 4. Landscape survey 5. Advanced irradiance modelling
Different types of tilt adjusting Optimum tilt and azimuth Fixed Mechanical tracking
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Different types of tilt adjusting Optimum tilt and azimuth Fixed Mechanical tracking Constant • Adjusted seasonally or monthly •
Optimization of tilt and azimuth Calculate solar position over year Set a range of θ m Integrate incident Obtain energy and A m power incident over year
90 1100 75 1000 Module tilt θ m (degrees) 60 900 45 800 30 700 15 600 0 Irradiation (kWh/m 2 ) 90/East 120 150 180/South 210 240 270/West Module azimuth A m (degrees/direction)
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Different types of tilt adjusting Optimum tilt and azimuth Fixed Mechanical tracking Constant • Adjusted seasonally or monthly •
Optimization of tilt and azimuth Calculate solar position over year selected period Set a range of θ m Integrate incident Obtain energy and A m power incident over year
Modules mounted on a tilted roof Solar Energy book, Appendix E
Recap Calculate solar position over year Set a range of θ m Integrate incident Obtain energy and A m power incident over year
Adjustable tilt angle http://www.solarpaneltilt.com/
Fixed angle http://truesolar-usa.com/solar-101.html
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