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A PHOTOVOLTAIC POTENTIAL MODEL WITH EXTENSION TO BUILDING FACADES

VALIDATION OF SOL. A PHOTOVOLTAIC POTENTIAL MODEL WITH EXTENSION TO BUILDING FACADES. S. Freitas 1,2 , D. Martins 1 , P. Redweik 3,4,5 , C . Catita 3,4 , C. Rodrigues 6 , A . Joyce 6 , M . C. Brito 3,5 1 SESUL – Centre for Sustainable Energy Systems , University of Lisbon

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A PHOTOVOLTAIC POTENTIAL MODEL WITH EXTENSION TO BUILDING FACADES

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  1. VALIDATION OF SOL A PHOTOVOLTAIC POTENTIAL MODEL WITH EXTENSION TO BUILDING FACADES S. Freitas1,2, D. Martins1, P. Redweik3,4,5, C. Catita 3,4, C. Rodrigues6, A. Joyce6, M. C. Brito3,5 1SESUL – Centre for SustainableEnergySystems, University of Lisbon 2MIT Portugal - SustainableEnergySystems Program 3IDL - Instituto Dom Luiz, University of Lisbon 4Centre of Geology, University of Lisbon 5DEGGE – Department of Geographic Engineering, Geophysics and Energy, University of Lisboa 6LNEG – LaboratórioNacional de Engenharia e Geologia

  2. Why solar potentialmodels for theurbanenvironment? Regulating Energy Efficiency in Urban Contexts The design of modern cities must be oriented towards the taking of the full potential of the solar resource • Weneedthesun… • Cities as great consumers of energy • Nearly Zero Energy Buildings (nZEB) • Fast technological improvement of solar energy • Decreasing costs of PV • Increasing public acceptance • However… • Limited available area • Insufficient solar radiation • Unfavourable meteorological conditions • Obstructions from the surroundings

  3. SOL:the solar potentialmodel The algorithm: Typical Meteorological Year (SolTerm database) Light Detection And Ranging (LiDAR) Digital Surface Model Mathematical sun-path model Sky View Factor Shadow algorithm: horizontal vs vertical surfaces Redweik et al, Solar Energy 97 (2013) 332-241 Complete irradiation map (1 hour time step, 1x1m2)

  4. SOL: thenouvelapproach to vertical facades What is interesting about facades? • In moderncities, the ratio betweenroofareaandfacadeareaishigh • Vertical PV facades will produce relatively more power in winter and less in summer • Different solar facades of a building will produce at maximum power at different times of the day Redweik et al, Solar Energy 97 (2013) 332-241 • Soiling rates will be much lower when PV panels are vertically installed • Less maintenance will be required • Solar potential doubles!

  5. SOL: Validation case study – LNEG Solar XXI building facade IST

  6. SOL: Validation case study - Methodology 1 2 • Solar XXI data: • Global vertical irradiation • Ambient temperature • SOL results: • Irradiation • Ambient temperature

  7. SOL: Validation case study – LNEG Solar XXI building facade 1. Measured Radiation to Photovoltaic production Marion, B., Prog. Photovol: Res. Appl.10, (2002) 264 205-214

  8. SOL: Validation case study – LNEG Solar XXI building facade 1. Measured Radiation to Photovoltaic production Shadow events

  9. SOL: Validation case study – LNEG Solar XXI building facade 1. Measured Radiation to Photovoltaic production

  10. SOL: Validation case study - Methodology 1 2 • Solar XXI data: • Global vertical irradiation • Ambient temperature • SOL results: • Irradiation • Ambient temperature

  11. SOL: Validation case study – LNEG Solar XXI building facade 2. Individual facade assessment VS Measured data South South Digital SurfaceModel Irradiance on vertical surfaces(30th November 3pm)

  12. SOL: Validation case study – LNEG Solar XXI building facade 3 % 2. Individual facade assessment VS Measured data

  13. Main conclusions and next steps… • Photovoltaic production from measured irradiance is validated • Overestimation of global vertical irradiance (, mainly in winter: diffuse irradiance algorithm needs revision • Check the whole model SOL by comparing the measured photovoltaic production with obtained u • Different spatial resolutions and smoothening of shadows Distribution of the strings on the facade Interpolation and smoothening to a 0.2x0.2m2 radiation grid 1x1m2radiationgrid

  14. Thank you! In the future…

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