Method for determining the efficiency of shading devices

  • YEAR
    2016
  • AUTHORS
    Tonelli Santos, Matheus
    Akutsu, Maria
    Camargo de Brito, Adriana
  • CATEGORIES
    2016 Conference Papers
    Architectural Science and Design Assessments
    Conference Papers

Extract

The effective control of solar energy can significantly impact a building`s energy efficiency. Understanding the shadowing behaviour of a shading device is a key step to establishing it`s consequences for the building`s thermal performance and user`s thermal comfort. This study presents a method to determine the efficiency of external shading devices throughout the year with regard to the variations of direct solar radiation intensity and the incidence period, in order to facilitate the evaluation and comparison of different shapes of shading devices, constituting a practical tool that assists it`s design. Simulations were made with Energy Plus software considering the latitude of the analysed location in order to determine the incident beam solar radiation on a vertical surface without shading and the reduction of incident solar energy with seven typical models of shading devices applied. Eight solar orientations and twelve “reference days” throughout the year with clear sky were considered. Analysing the shading devices efficiency for São Paulo, Brazil as an example of the method application, among the conclusions drawn it is emphasized that to the east and west orientations, the horizontal shading device is more effective than the vertical, especially from September to March.

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