solarfassade.info - portal for building integrated photovoltaics

Sunshading

In addition to the numerous tasks as part of a building (e.g. protection against heat and weather), semitransparent PV façades and PV roofs also provide shade from the sun. A suitable sunshading element contributes significantly to controlling the indoor climate and light conditions inside the building. As such, it can help save energy by reducing the building’s cooling load.

Exterior sunshading is more effective than interior as it does not even allow the solar radiation to enter the building. The most important tasks of an external sunshading system are thus (hagemann 2002):
  • protection against direct sunlight
  • protection against glare
  • modulation of daylight
  • cooling of the building envelope
Photovoltaic sunshading optimally oriented to the sun and optimally ventilated guarantees maximum electricity yields.

Example project: EWE Arena Oldenburg, Germany

72 photovoltaic modules and 72 glass screen-printed elements are installed in front of the Arena’s façade. The PV sunshade/shield structure is more than six metres high and 40m long. The PV modules, wired together to create large arrays, move 160m along the façade depending on the position of the sun. At half-hour intervals, the shield moves step by step along the south half of the arena.


Figure 1: PV sunshading, EWE Arena Oldenburg

Source: colt 2009

Figure 2: Detail of PV sunshading, EWE Arena Oldenburg

Source: colt 2009

Last page update: 25.01.2011