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Esquivias, P.M.; Muñoz, C.M.; Acosta, I.; Moreno, D.; Navarro, J. (2016). Climate-based daylight analysis of fixed shading devices in an open-plan office

REVISTA: Lighting Research and Technology, 48, 205-220
IMPACTO: JCR (2016): 1,784. CONSTRUCTION & BUILDING TECHNOLOGY, Q2 (20/61)
DOI: 10.1177/1477153514563638

ABSTRACT:

Office buildings consume large amounts of energy and are responsible for large amounts of greenhouse gas emissions worldwide. Among building energy efficiency measures, solar shading plays a significant role in reducing building energy consumption for cooling. This study analysed the influence of solar protection on daylighting of an open-plan office. Climate-based daylight modelling (CBDM) was used to predict such metrics as Daylight Factor (DF), Daylight Autonomy (DA) and Useful Daylight Illuminances (UDI). The results obtained showed that overhangs, and horizontal and vertical louvres have similar behaviours and sidefins have no relevance to indoor daylight conditions. In all cases it has been proven that excessive obstruction may yield an excessive reduction in a range of illuminances between 500 and 2000 lux, increasing lighting energy consumption.

 

HIGHLIGHTS:

 

• Analysis of the impact of fixed shading devices on climate-based daylight performance metrics.
  
• Comparison of DF and DA results (traditional diffuse vs new global illuminance daylight metrics).
• Based on daylight simulations carried on by the validated RADIANCE-based program DAYSIM.
• For each fixed shading device four options have been studied.
• Comparative analysis in terms of DF, DA and UDI scheme.
• Fixed shading devices highly affect to daylighting due to blocking sunlight (thus direct solar radiation)
• Luminous and thermal impact have to be taken in consideration for a well-designed shade.