Energy efficient electric lighting for buildings in developed and developing countries
Doctoral thesis (article-based)
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AbstractAs energy is a fundamental service for human development and economic growth, the demand for it is constantly on the rise worldwide. Lighting energy use makes a significant contribution to the total energy consumption of buildings. The use of energy efficiency measures can reduce this kind of energy consumption. The main objectives of this work were to review different aspects of lighting quality and energy efficiency and to test the existing technologies for efficient lighting. An additional aim of the work was to examine the new opportunities provided by LED technology in providing lighting in rural areas of developing countries and to compare LED lighting with existing fuel-based lighting. Three different lighting control systems in office rooms were compared for energy efficiency and the quality of lighting by means of measurements. The results of the measurements showed a significant potential for saving energy by the use of daylight-based dimming and occupancy control. The renovation of an auditorium with a new lighting installation resulted in higher illuminance levels and better colour rendering, while reducing energy consumption. This work also presents a calculation of lighting energy use in office rooms using two different calculation methods and discusses the different parameters used for the calculation. A comparison of the calculated values with the measured values confirmed the accuracy of the calculation methods. The work presents a study and evaluation of traditional pine stick lighting and new white LED-based lighting used in rural Nepali villages. The use of different renewable energy sources in combination with efficient lighting technology is found to be a realistic and sustainable option to provide clean and efficient lighting services in developing countries.
lighting efficiency, office lighting, solid state lighting, fuel based lighting, renewable energy
- [Publication 1]: Pramod Bhusal. 2006. Accuracy of the lighting energy calculation method. Light & Engineering, volume 14, number 1, pages 39-47. © 2006 Znack Publishing House. By permission.
- [Publication 2]: Pramod Bhusal, Eino Tetri, and Liisa Halonen. 2006. Quality and efficiency of office lighting. In: Proceedings of the 4th European Conference on Energy Performance and Indoor Climate in Buildings and the 27th International AIVC Conference (EPIC 2006 AIVC). Lyon, France. 20-22 November 2006, pages 535-540. © 2006 Ecole Nationale des Travaux Publics de l'Etat (ENTPE). By permission.
- [Publication 3]: P. Bhusal, E. Tetri, and L. Halonen. 2006. Energy efficient and photometric aspects in renovation of auditorium. In: Proceedings of the 4th European Conference on Energy Performance and Indoor Climate in Buildings and the 27th International AIVC Conference (EPIC 2006 AIVC). Lyon, France. 20-22 November 2006, pages 867-872. © 2006 Ecole Nationale des Travaux Publics de l'Etat (ENTPE). By permission.
- [Publication 4]: Pramod Bhusal, Alex Zahnd, Marjukka Eloholma, and Liisa Halonen. 2007. Replacing fuel based lighting with light emitting diodes in developing countries: energy and lighting in rural Nepali homes. LEUKOS, The Journal of the Illuminating Engineering Society of North America, volume 3, number 4, pages 277-291.
- [Publication 5]: P. Bhusal, A. Zahnd, M. Eloholma, and L. Halonen. 2007. Energy-efficient innovative lighting and energy supply solutions in developing countries. International Review of Electrical Engineering (I.R.E.E.), volume 2, number 5, pages 665-670. © 2007 Praise Worthy Prize. By permission.
- [Publication 6]: Pramod Bhusal, Eino Tetri, and Liisa Halonen. 2008. Lighting and energy in buildings. Espoo, Finland. 23 pages. Helsinki University of Technology, Department of Electronics, Lighting Unit, Report 47. © 2008 by authors.