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[en russe/in russian]

Author(s) : SAVIC A., ILIC M.

Summary

The aim of this study is to show advantages of using T8 LED tubes instead of classic T8 fluorescent tubes in the existing lamps in a school classroom. Students of the Electric Energy Technician program at the Secondary School of Electrical Engineering “Rade Koncar” in Belgrade, worked on a lighting project for their classroom. Within their Optional Activities Group for Energetic Efficiency and Renewable Energy, they developed a project which included changing the existing lightning system – which uses classic T8 tubes – to the one using T8 LED tubes. During and after this project the students measured the active, reactive and apparent power of electrical lightning, as well as the quality and the intensity of lightning. Analyses of the resultss of measurements in a control classroom (with standard T8 tubes) and a classroom with the new T8 LED tubes show how they achieved reduction of power consumption by 61 % , while the quality of lighting was 66 % higher. At the same time, the color of the light was changed, so a Cold White 6500 K light transformed to a Warm White 4000 K light. Total consumption of the electric lightning at “Rade Koncar” school amounts to 35,64 kW, using 330 bulbs equipped with electromagnetic ballast and 660 pieces of standard T8 fluorescent tubes, each of them 36W strong. By changing all 660 existing T8 fluorescent tubes with T8 LED tubes, the power consumption would be reduced from 35,64 kW to 13,89 kW. During the installation of tubes, the electromagnetic ballast got a short switchover, significantly cutting the reactive power. At the moment, lighting the school consumes 35.600 kWh of electric energy per year. After the installation of T8 LED tubes, the consumption of energy would be reduced to 14.890 kWh per year. The difference of 21.750 kWh is worth 2.825,00 €, which is enough monez to buy 565 T8 LED tubes. The study also presents how an investment in LED lightning would be returned within just 14 months, on the condition that T8 LED tubes installation is performed by students, as part of their Optional Activity Group for Energetic Efficiency and Renewable Energy. Students thought that Warm White 4000 K light was a good choice. In an opinion poll, students described the working conditions in the LED-lighted classroom as "much more pleasant" than in the Control Classroom with Cold White 6500K light. The study also presents results of School of Electrical Engineering “Rade Koncar”'s cooperation with the Gerontology Center in Belgrade. The students of the School – members of Optional Activity Group for Energetic Efficiency and Renewable Energy – worked on a project designing Energy Efficient lighting system for the Adult and Elderly Care Center in Diljska Street. The project consisted of LED tube installation (instead of existing fluorescent tubes). Before the installation, students would perform necessary lighting and energy measurements, then repeat the same measurements after the installation of LED tubes.

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Pages: 8 p.

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Details

  • Original title: [en russe/in russian]
  • Record ID : 30020250
  • Languages: Russian
  • Source: 47th International HVAC&R Congress and Exhibition.
  • Publication date: 2016/12

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