Energy Conservation and Sustainability Due to Passive Daylight System of Light Pipe in Indian Buildings

  • Abdus Salam Azad
  • Dibakar Rakshit
Part of the Green Energy and Technology book series (GREEN)


With continuous increase in energy usage in Indian building sector, share of electricity has risen to 35% of total electricity consumption. Therefore, achieving energy efficiency in buildings by adopting solar passive design strategies is lucrative. It is important to mention that in India, electricity consumption in lighting a commercial building is high and about 25% of the total electricity consumption. It is therefore imperious to evolve techniques that cut down the energy consumption for lighting load and thus develop energy efficient buildings. Tubular light guide is modern and innovative system which can be used to improve illumination for buildings that require more electrical light during daytime. This is done by utilizing the natural light to illuminate the interior space and save a significant amount of lighting energy. The study involves analytical and experimental investigation of a tubular light pipe for prediction of illuminance distribution inside a room of 3 × 3 × 2.7 m3. For this purpose, predictive performance of existing empirical models has been compared with two commercially available software EnergyPlus and Holigilm. The daylight penetration factor (DPF) has been evaluated on the horizontal working plane through available empirical models. The DPF obtained by these empirical models and software is compared with experimental values and is found to have a good agreement. Besides this, annual energy saving potential having windows and light pipe in a room for different Indian climatic conditions has been evaluated.


Daylighting DPF Light pipe Lighting energy 


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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Centre for Energy Studies, Indian Institute of Technology DelhiNew DelhiIndia

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