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2000 Lux), and “UDI Fell-Short” (< 100 Lux) in different months of the year in 9 am, 12 pm and 3 pm. At the end, the distribution of illumination in each room was calculated to determine the variation of the light pattern in two conditions of closed and open windows. It shows that according to this pattern, each room will be suitable for “visual interest” or “visual acuity” with regards to its function.
The results show that in Ameri House, daylighting design is performed in 4 levels. The first level is neighbourhood conditions; to decide about the relation of outdoor and indoor spaces in plan and section to have at least 40-degree “visible sky angle” for the main spaces. Second level is the specification of the main spaces and their adjacent rooms; that are located on the main axis of the yards with the best view and lighting condition. Third level is the depth and geometry of the rooms and details of the windows to help appropriate visual uniformity or diversity of illumination according to the function of the room. The depth of the room regarding to the height of the window is always less than the perimeter zone. It gives the architect the ability to choose the window details such as mesh frames and colour glazing to control the glare in front of the room without darkness problem in the further parts and have a better spread of illumination contours.
Fourth level is the interior layer spaces that have no direct access to daylight. In this case, different ceiling lighting systems such as “skylights”, “light scopes” and other systems are used to prepare daylight and natural ventilation simultaneously.
This study shows that, to have a good daylight pattern in buildings it is very important to take into consideration the daylighting system and strategies form the primary stage of design process (such as choosing mass and space, yards and spaces location, dimension and orientation toward the sun, sky view angle of the rooms and their openings) to the final detail stages (such as depth, dimension and details of the rooms and their openings) according to importance of the spaces related to their functions and accessibility.]]>
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