Design Aids for Supplementary Lighting Design in India
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ORIGINAL CONTRIBUTION
Design Aids for Supplementary Lighting Design in India Sayantani Lala1 • Kshitij Jain1 • Ashok Kumar1 • Anuj Kumar1 E. Rajasekar2 • Kishor Kulkarni1
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Received: 29 November 2019 / Accepted: 31 August 2020 The Institution of Engineers (India) 2020
Abstract This paper presents a design aid which will help to integrate daylight in indoor lighting and optimize the use of artificial lighting in buildings for different climate zones in India. An index, average daylight factor is utilized for calculating the incident useful daylight in an indoor space. These calculations are further used in deriving nomographs which can help to determine the optimum percentage of fenestration/floor area for a typical small office. The use of these nomographs will be advantageous in the initial stages of planning an energy-efficient building by optimizing on the measure of fenestration area. The results obtained from the nomographs are compared with the simulation results from the VELUX daylight visualizer tool and are found to be within acceptable limits of error (\ 10%).
& Sayantani Lala [email protected]; [email protected] Kshitij Jain [email protected] Ashok Kumar [email protected]; [email protected]
Keywords Average daylight factor (ADF) Daylight integration Design aids Nomographs Energy efficiency List of Symbols DF Daylight factor ADF Average daylight factor L Length of the room D Depth of the room h Ceiling height of the room H Height of obstruction S/H Separation/height ratio of obstruction h The vertical angle subtended at the centre of the window by the visible sky R The average reflectance of all surfaces in room s The diffused light transmittance of the glazing M Maintenance factor W Glazing area Ein Luminance inside the room according to functional requirement Eo Outside luminance of the place at which the building is located g Average efficacy of each lighting source A The area of all surfaces in the room
Anuj Kumar [email protected] E. Rajasekar [email protected]; [email protected] Kishor Kulkarni [email protected]; [email protected] 1
CSIR-Central Building Research Institute (CBRI), Roorkee, Uttarakhand, India
2
Indian Institute of Technology (IIT), Roorkee, Uttarakhand, India
Introduction The use of daylight in indoor lighting has been in practice since ages. Even in earlier times, buildings were designed considering the orientation of windows. Natural light from the windows was utilized for indoor illumination. During the industrial revolution, different technologies like the use
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J. Inst. Eng. India Ser. A
of mirrors and other innovations that can enhance the use of natural light by reflection were discovered. Even after the invention of artificial bulbs, daylight was being used to optimize the electricity consumption in houses. However, with time, the need for smaller floor plans to accommodate larger population became a necessity. Artificial lights came to be used abundantly, to light up the indoor spaces of small houses without suff
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