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Courtyard in a building regulates its daylight air movement and thermal interaction with outdoor environment The daylight performance of a courtyard depends principally on how the daylight received and delivered into interior spaces The current research investigates how courtyards vertical surface geometries could improve the daylight in adjacent spaces of the courtyard The research used Radiance to investigate the impact that vertical walls inward sloped walls outward sloped staggered wall walls and double layer walls could have on both daylight quantity and quality Courtyards with Inward sloped and staggered wall and double layer walls were found to improve the daylight quality while outward sloped and staggered walls increase daylight level IntroductionUsing daylighting goes beyond improving the visual environment to improving human health increasing user productivity reducing operating and life cycle costs maintaining sustainable development and saving non-renewable energy Daylighting has long been recognized as crucial and a useful strategy in terms of visual comfort and energy-efficient building design Li et al 2004 Li 2007 Lam and Li 1998 Wittkopf et al 2006 Bauer 2002 Freewan et al 2008 Psychologically occupants prefer natural light as it offers a direct connection with outside and enhances visual quality human feeling and comfort Daylighting gives the sense of cheeriness and brightness and helps to create healthier and more attractive environments for the occupants and improves their behaviour Li and Lam 2001 Heschong 1999a Heschong 1999b Nazzal 2001 Lighting represents 20-60 of a buildings electricity consumption in commercial and office buildings Bodart and De Herde 2002 studied how different facade windows and glazing options could change the energy consumption The study found that a good daylighting design could save from 40 to 50 based on different variables Zain-Ahmed et al 2002 studied the saving achieved as a result of using daylighting in buildings design Using natural daylight for lighting purposes in buildings can therefore offer significant savings in energy consumption for lighting and consequently cooling Daylight
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