Е-Публикации
Технически университет - София

Abstract: In the commonly encountered tunnels up to 500 m, the main lighting costs are determined by the daytime adaptation lighting. With an annual usability for Bulgaria of 4600 hours per year, the payment of funds for the rehabilitation of this type of equipment is determined by the purchase price of the illuminators and the costs of electricity and maintenance. The latter are relatively permanent, as modern LED lights last almost 10 years, after which they are replaced with more energy-efficient ones. Therefore, when replacing outdated lighting fixtures, a reasonable period for recovering the investment for the rehabilitation of this type of equipment is up to 5 years. The invested funds are recovered at the expense of lower electricity costs and easier maintenance, which is achieved by: 1) providing CLO (Constant Light Output) - reducing the intensity of light (dimming) of light sources (LS) in depending on their aging, avoiding energy overspending due to the MF=0.67 (Maintenance Factor) adopted in the design; 2) dimming of LS in the hours with reduced traffic, according to the conditions for safe traffic. Both ways do not require expensive technical facilities, which is why comparing expensive luminaires with high energy efficiency and cheaper ones with lower energy efficiency is not always in favor of the former. The report examines this aspect of an opportunity to rehabilitate daylight tunnel lighting for a tunnel in Bulgaria.

References

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