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Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings

Author

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  • Atthakorn Thongtha

    (Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand)

  • Peeranat Laphom

    (Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand)

  • Jiraphorn Mahawan

    (Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand)

Abstract

This study investigates the properties of light transmission and distribution, examining how incident light angles impact illuminance distribution and daylight factor. Light tubes are acknowledged as promising tools to enhance lighting conditions and reduce energy consumption in building design. The study involved installing horizontal hollow light tubes, each measuring 0.5 m in length and 0.30 m in diameter, on a wooden test model. A 20-watt LED lamp was employed as the light source, and an illuminance meter recorded the values at various horizontal and elevation angles. The study’s assessment included calculating the average illuminance and daylight factor to obtain light transmission efficiency and energy-saving potential. The findings revealed that both aluminum alloy and zinc alloy tubes experienced a decrease in illuminance as incident elevation angles increased, with the most effective light transmission occurring at a horizontal angle of 90°. Notably, the aluminum alloy tube outperformed the zinc alloy tube, demonstrating more than a 15% increase in light transmission efficiency. Furthermore, the daylight factor values from both types of tubes aligned with established standards for residential and office activities, underscoring their potential as energy-efficient lighting solutions for spaces lacking natural light or with limited illumination.

Suggested Citation

  • Atthakorn Thongtha & Peeranat Laphom & Jiraphorn Mahawan, 2023. "Investigation of the Efficacy of Horizontal Hollow Light Tubes for Energy Conservation in Illuminating Buildings," Energies, MDPI, vol. 16(22), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7545-:d:1278754
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    References listed on IDEAS

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