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Sustainability 2016, 8(11), 1092; doi:10.3390/su8111092

Management Optimization of the Luminous Flux Regulation of a Lighting System in Road Tunnels. A First Approach to the Exertion of Predictive Control Systems

1
DIAEE—Area Fisica Tecnica, Università degli Studi di Roma “Sapienza”, Via Eudossiana, 18-00184 Rome, Italy
2
DIMI—Università degli Studi “Roma TRE”, Via Vito Volterra, 62-00146 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Asdrubali
Received: 12 July 2016 / Revised: 23 September 2016 / Accepted: 20 October 2016 / Published: 25 October 2016
View Full-Text   |   Download PDF [3428 KB, uploaded 25 October 2016]   |  

Abstract

Lighting very long road tunnels implies a high consumption of electrical energy since it requires a proper illumination during the whole day. In particular, in the daytime, the illuminance levels right at the tunnel entrance threshold and exit zones must be higher than those characterizing the inside of the tunnel; in this way, the eye of the driver is able to adapt and be safe while passing from a high natural illumination of the outside to the lighting conditions characterizing the inside of the tunnel. However this causes a high energy demand. Therefore, this case study investigates whether it is possible to minimize the energy demand through the exertion of an automatic new control system regulating the luminous fluxes of artificial sources (guaranteeing the parameters set by the regulation) with respect to the variation of the natural light characterizing the outside. The innovative control systems must be characterized by high reliability levels in order to guarantee conditions which are not dangerous to the driver if an outage occurs and minimize their maintenance costs. To carry out this type of study, the software DIALux was used to simulate a tunnel with a dimming system (with lamps characterized by a high luminous efficiency) regulated by a pre-programmed logic control system (with high Mean Time Between Failure (MTBF) values). The savings obtained enabled the amortization of the solution here suggested in a time interval that makes it an advantageous choice economically speaking. View Full-Text
Keywords: road tunnel; lighting systems; LED; control system; energy optimization; amortization costs road tunnel; lighting systems; LED; control system; energy optimization; amortization costs
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Salata, F.; Golasi, I.; Poliziani, A.; Futia, A.; de Lieto Vollaro, E.; Coppi, M.; de Lieto Vollaro, A. Management Optimization of the Luminous Flux Regulation of a Lighting System in Road Tunnels. A First Approach to the Exertion of Predictive Control Systems. Sustainability 2016, 8, 1092.

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