Study of a daylight &amp;#x201C;filter&amp;#x201D; zone in tunnels

Drakou, Dionysia; Burattini, Chiara; Bisegna, Fabio; Gugliermetti, Franco

doi:10.1109/eeeic.2015.7165241

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…However, energy demand not plays a key role only in building energy performance [36,37], it is also represents in road tunnels a significant weight, economically speaking, on road networks. The current regulation [1][2][3][4][5][6] requires luminance levels able to guarantee a visual comfort for the drivers because they must not encounter situations that might alter their visual perception while crossing the threshold zone of the tunnel [38]. The sections that must be provided with emergency lighting that is adequate with respect to outdoor solar illumination also depends on the maximum driving speed allowed and require high levels of luminous fluxes.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2016

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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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2016

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“…i) The threshold zone is displaced outside of the tunnel where the transparency of the structure can effectively ensure the luminance requirements are met with the use of filtered, natural sunlight. [7][8][9][10][11][12] ii) The structure acts as a type of sun-shade, reducing the veiling luminance (L seq ) and therefore the luminance required in the threshold zone. 7,13 Point ii) is especially relevant for the tunnel in this study because it is oriented along the east-west axis, bringing sunlight directly into the line of sight of drivers in the mornings and evenings, causing disability glare.…”

Section: Sunscreen Structuresmentioning

confidence: 99%

“…The application of sunscreen structures to reduce energy consumed by tunnel lighting systems is widespread. Researchers have tried to reduce energy consumption and daytime lighting loads using sunscreen structures using two general methods: i)The threshold zone is displaced outside of the tunnel where the transparency of the structure can effectively ensure the luminance requirements are met with the use of filtered, natural sunlight ii)The structure acts as a type of sun‐shade, reducing the veiling luminance (L seq ) and therefore the luminance required in the threshold zone …”

Section: Introductionmentioning

confidence: 99%

Application of semitransparent photovoltaics in transportation infrastructure for energy savings and solar electricity production: Toward novel net‐zero energy tunnel design

Sun

Athienitis

D'Avignon

2019

Progress in Photovoltaics

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Lighting subsystems account for up to 50% of the energy consumption of a typical tunnel. Day‐time lighting levels account for over two‐thirds of the total system lighting power; their periodic nature creates daily peaks in the tunnel's energy load profile. This paper studies the integration of semitransparent photovoltaic (STPV) cells into sunscreen structures installed above tunnel entrances to reduce tunnel lighting requirements and offset their day‐time lighting loads using energy generated from PVs. The electrical lighting load of a typical 1‐km length road tunnel with and without STPV sunscreen structures was modeled to establish the potential for energy savings. Using a daylighting and energy modeling plug‐in called DIVA, the transparencies and ratios of photovoltaics (PV) to glass of a STPV sunscreen that are in accordance with the luminance reduction code requirements were determined. Reduced lighting requirements over the whole tunnel length, including the threshold, transition, and interior lighting zones of the tunnel were considered, resulting in significant energy savings. The annual power production of the sections covered with STPV was then simulated using the PVsyst software. The integration of PV cells resulted in an annual energy production that reduced annual net‐energy use by up to 7% and with the potential to reduce electric lighting loads by up to 60% during the day‐time. Results also demonstrated that STPV sunscreens have the potential to meet luminance requirements if supplemented with an intelligent lighting control system.

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“…In recent years, research groups around the world have focused their efforts on the development of strategies to introduce natural light inside the tunnels [31][32][33], or to shift the threshold zone, which is the most consuming part, out of the tunnel, using a part of the sunlight, properly filtered and attenuated [34][35][36][37][38][39]. The most promising strategy in this last case is the use of pre-tunnel pergolas, whose construction before the portal gate can yield energy savings in the threshold zone of about 40% [35].…”

Section: Lighting Infrastructures: Use Of Sunlight In Road Tunnelsmentioning

confidence: 99%

Proposal to Foster Sustainability through Circular Economy-Based Engineering: A Profitable Chain from Waste Management to Tunnel Lighting

et al. 2017

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Abstract:The increasing demands of infrastructures in terms of energy consumption, raw material demand, greenhouse gas emissions, waste management, treatment of components after their lifetime period, and financial costs are nowadays a serious threat for sustainability. Given that the resources are limited, it is difficult to ensure an accurate level of well-being for future generations. For this reason, new perspectives in design, production and consumption are necessary. In this work, the principles of circular economy are applied to concrete branches of engineering. Departing from a design orientated to new uses after life period of infrastructures, a circular economy-aimed engineering makes possible the connection and mutual profit of such different branches like waste management and tunnel lighting. The benefits in environmental and financial terms are a strong argument in favor of a stronger link between engineering and circular economy.

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Study of a daylight “filter” zone in tunnels

Cited by 17 publications

References 6 publications

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

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

Application of semitransparent photovoltaics in transportation infrastructure for energy savings and solar electricity production: Toward novel net‐zero energy tunnel design

Proposal to Foster Sustainability through Circular Economy-Based Engineering: A Profitable Chain from Waste Management to Tunnel Lighting

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