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Counterbalancing daylighting, glare and view out: the role of an external shading system control strategy.

Number: pap. 855

Author(s) : KONSTANTOGLOU M., KONTADAKIS A., TSANGRASSOULIS A.

Summary

To protect building shells from solar radiation, allow daylight in and improve the envelope’s performance, it is critical to adopt shading systems with advanced controlled strategies. This research explores the definition of an optimized control strategy that counterbalances solar protection – daylight adequacy, glare reduction and view out. More specifically it examines a new dynamic control strategy for an exterior non-retractable louver system installed in a typical office space. Primary goal of the control system is to increase daylighting levels and maintain a predefined illuminance level on the work plane surface, while managing solar gains and protecting from glare. The proposed control strategy is defined with the optimization process of three different control strategies based on three performance criteria accordingly: required illuminance levels; glare reduction and; view out. To define the dynamic control strategy, a series of simulations were performed in EnergyPlus. Consumption for lighting, heating and cooling has been calculated for a set of slat angles of the shading system. Hourly daylighting simulations calculated illuminance levels on predefined sensor points. For each point and each hour of the day and year, tilt angle is estimated while illuminance is calculated using linear interpolation between adjacent tilt angle values. To optimize the control performance based in occupants’ visual comfort, an annual glare analysis was conducted using the daylight glare index concept (DGI).

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Pages: 10 p.

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Details

  • Original title: Counterbalancing daylighting, glare and view out: the role of an external shading system control strategy.
  • Record ID : 30010008
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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