T4.5 - Solar energy potential assessment
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This document outlines a process for assessing the solar energy potential of rooftops using 3D city models and GIS tools. The key steps include: 1. Identifying suitable roof areas using calculations of roof geometry, orientation, and a minimum size threshold. 2. Calculating monthly solar irradiation on rooftops using a GIS tool called R.SUN, which factors in inclination, orientation, atmosphere, and shading. 3. Assessing the solar energy potential of identified roofs based on irradiation levels, panel area, efficiency, and other parameters. Metrics like energy yield, costs, and carbon savings are estimated. 4. Providing reports on evaluation results like energy production potential and return
![irradiation calculation - R.SUN
GRASS GIS - R.SUN
(Geographic Resources Analysis Support System)
Free open source geographical information system
R.SUN
Computes solar irradiation raster maps for given day,
latitude, surface and atmospheric conditions.
The shadowing effect of the topography is optionally
incorporated.
Result - irradiation raster map
[Wh/ m² * period]
Computing of electrical power](https://image.slidesharecdn.com/t45solarenergypotentialassessmentservicemoss-130517032947-phpapp01/85/T4-5-Solar-energy-potential-assessment-9-320.jpg)
T4.5 - Solar energy potential assessment
- 1. Presented by: Leo Menzinger M.O.S.S. T4.5 Solar energy potential assessment
- 2. Outline • Solar energy potential assessment – Requirements – System architecture – Calculation – Assessment and reporting • Heat dispersion
- 3. Solar energy potential assessment Requirements Roof information • Area • Orientation Solar irradiation Additional information to • Panel • Costs • Energy consumption
- 4. Calculate continuous roof areas 1. Identify geometry of all roof segments CityGML ≤ LoD 2 + BoundedBy(Roof) 2. Generation of continuous roof areas Identify planar roof structures (e.g. excluding dormer of roofs) Parameter: tolerance (e.g.: =3-5°) 3. Calculate roof area (m2) Filtering of roof areas Parameter: Minimal roof area (e.g.: 5 m2) Combining roof areas
- 5. Solar irradiation - dependency from roof n: Dachfläche-Normalvektor (senkrecht auf die Dachfläche) d: Sonnenstrahl-Richtung φSolDiff = 30? φSolDiff = 0? (volle Bestrahlung) φSolDiff = 45? φSolDiff = 90? (verschattet) φSolDiff > 90? (verschattet) Dachfläche-Neigung (im Beispiel: 45?) φSolDiff : Winkel zwischen dem Dachflächenormal und der Sonnenstrahlrichtung 100% 50% ca. 67% 0% 0% Farbkodierung (Dach) warm: geeignet kalt, verschattet: ungeeignet d d d d d n n n n
- 6. Solar potential assessment – system architecture solar potential assessment service 3D City DB request r.sun Irradiation calculation Parameter / settings Yield Area …. Solar potential calculation
- 7. Solar potential assessment – system architecture solar potential assessment service Irradiation calculation Parameter /settings Solar potential calculation Solar potential assessment service Irradiation calculation (IND) • Precondition for solar potential calculation • Pprecalculation on monthly base (Performance reasons) • Calculation settings Solar energy potential calculation (MOSS) • requires irradiation calculation • Building ID • assessment settings
- 8. irradiation calculation irradiation calculation service 3D CityDatabase r.sun Precalculated irradiation
- 9. irradiation calculation - R.SUN GRASS GIS - R.SUN (Geographic Resources Analysis Support System) Free open source geographical information system R.SUN Computes solar irradiation raster maps for given day, latitude, surface and atmospheric conditions. The shadowing effect of the topography is optionally incorporated. Result - irradiation raster map [Wh/ m² * period] Computing of electrical power
- 10. irradiation calculation – Influencing factors GRASS GIS - R.SUN Influencing factors • Inclination and orientation of roof • Atmospheric conditions direct (beam) diffuse reflected
- 11. irradiation calculation– Influencing factors Influencing factors • Geographical position • Period of evaluation Principally free Statistical evaluation Hours of sun/day depends on season GRASS GIS - R.SUN
- 12. Solar energy potential assessment solar potential assessment service 3D City database request Precalculated irradiation Buildings roofs Yield Area …. Parameter / settings calculation algorithm
- 13. Solar energy potential assessment - prototype Demo
- 14. Evaluation and reporting Energy yield • Solar irradiation (precalculated) • Total panel area • Panel efficiency • Energy loss in transmission
- 15. Evaluation and reporting Costs • Total area of panels (m2) • Price of solar panels • Costs of installation • Costs for additional equipement • Costs for operating the plant
- 16. Evaluation and reporting Reduction of costs Return of investment • Averaged energy costs (actual) • Actual energy consumption • Feed-in tariff
- 17. Evaluation and reporting Carbon savings / year • Actual CO2 emission in energy production (energy sources)
- 18. heat dispersion infra-red areal surveys Partner: Geofoto LLC, Zagreb Heat loss from roofs (GEOF) Temperature • min • max
- 19. Heat loss from walls heat dispersion Offer from T4.1: Texturing via - novaFACTORY import - SketchUp
- 20. Thank you for your attention Contact details Leo Menzinger M.O.S.S. - [email protected]