Volume 9 Issue 3 - January 2018

  • 1. Assessment of design sky for design of day lighting in buildings in capital region - delhi, india.

    Authors : Prof.dr.ramesh Srikonda

    Pages : 148-154

    DOI : http://dx.doi.org/10.21172/1.93.25

    Keywords : IES Model, Sky component, Design Sky, Daylight factor,

    Abstract :

    Window is an opening designed or created in the wall or any exposed surface to the external environment to admit daylight and cross ventilation and also contributing to thermal comfort conditions. The primary function of a window/opening is served by a sheet of glass fixed in the frame of the window/ opening, which can be termed as a dead light if no part of the window/opening can be opened. As the window/opening is the part of the wall or roof envelop to the building, it should serve to exclude wind, rain, and act as a barrier to excessive transfer of heat, sound, and spread of fire in much the same way of the surrounding wall or roof. The functional material of a window/opening glass is effective enough to admit daylight and excluding wind and rain but is a poor barrier to the transfer of heat, sound and spread of fire. The traditional window/opening is usually designed to ventilate rooms through one or more parts that open to encourage/allow an exchange of air between indoor and outdoor environment. Ventilation is not a necessary function of a window/opening for controlled environment but it is an essential parameter for the non-air conditional buildings in general and tropical countries in particular. This paper deals exclusively to draw adequate daylight to internal spaces from available daylight at outside. So it is felt essential to analyze the available day light at outside particularly at Delhi region, India which can be used as design sky to work out the desirable daylight to requirement to indoor functional space. NBC 2005 generalized the available day light for India to size the window/ openings, roof light, north light etc., to even draw desirable lighting levels. But India is a large country having wide variations in natural lighting conditions. So the indoor day lighting varies from location to location with respect to the cloudy days etc. Unless the exact Design sky is not known to a particular station, the opening design may contribute to either under lighting or over lighting to the indoor spaces. The under lighting may force the occupants to use artificial lighting, whereas over lighting may result to admit excessive heat. In addition to this, increased size of the opening may cost more relatively, in comparison to the vertical wall.

    Citing this Journal Article :

    Prof.dr.ramesh Srikonda, "Assessment of design sky for design of day lighting in buildings in capital region - delhi, india.", https://www.ijltet.org/journal_details.php?id=926&j_id=4303, Volume 9 Issue 3 - January 2018, 148-154, #ijltetorg