Insolation of Interiors: The Dead Angle Analysis

Abstract:

Quality of the indoor environment is determined by physical and psychophysical factors. People spend in the interiors most of the time during the day. Therefore indoor visual, thermal and acoustic effects are important for their health and work productivity. Visual environment can be evaluated in term of daylight availability, spatial luminance distribution and access to sunlight. Unless availability of sky/diffuse light can be considered for window design because of low intensities, the direct sun radiation with its original wavelength composition and high intensity is important for health and stimulation of human body organs in moderate climatic zones. To evaluate access to sunlight, there is necessary to determine the sun position on the sky, dimensions of envelops and windows as well as orientation of significant apertures and potential impact of external obstructions. Sun rays reaching the window surface can or cannot penetrate into the interior. This depends on the angle of sun beam incidence, orientation and dimensions of the aperture, thickness and structure of the envelope. Angle in which incident rays penetrate in the interior is so called acceptance angle. Angle in which incident rays are not causing insolation of interiors or cannot penetrate through the window glazing is so called dead angle. This paper analyses and discusses the meaning and dimensions of the dead angle.

• Periodical: Applied Mechanics and Materials (Volume 824)
• Pages: 699-706
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.824.699
• Online since: January 2016
• Authors: Stanislav Darula, Marta Malikova
• Keywords: Aperture, Dead Angle, Insolation of Interiors, Sunlight

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