2026-04-17T21:19:05Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/883862026-02-02T10:05:23Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Casals, Miguel author Gangolells Solanellas, Marta author Forcada Matheu, Núria author Macarulla Martí, Marcel author 2016-07-01 Lighting systems are usually one of the largest electrical end-uses in underground metro stations. Taking into account that budget restrictions in publicly owned companies hinder energy efficiency retrofit projects that require high initial investments, affordable energy saving strategies are needed. This paper presents a low-cost approach for reducing lighting electricity use in underground stations, without affecting passengers' comfort or the metro operator's service. For this purpose, an adaptive lighting strategy of dimming the illuminance levels of artificial light sources has been developed. Dimming controls are based on the occupancy of the station, and the preventive maintenance and cleaning cycles of the luminaires. The stations' monthly occupancy patterns are defined through the k-means clustering technique. To illustrate its effectiveness, the method was applied to 115 underground stations of the Barcelona metro network. The results revealed overall electricity savings of 255.47 MW h on a biannual basis, which represents 36.22% of the stations' baseline lighting consumption. Individual energy savings were found to range from 25 to 87.5 MW h/year in the stations of the Barcelona metro network, depending on the number and profile of station users. The research findings will undoubtedly be useful for the future energy efficiency project plans of worldwide metro operators and managers of other underground spaces. Peer Reviewed Postprint (author's final draft) Àrees temàtiques de la UPC::Energies::Eficiència energètica Àrees temàtiques de la UPC::Enginyeria civil::Infraestructures i modelització dels transports Subway stations Subways--Environmental aspects Energy efficiency Electric lighting Lighting system Dimming Energy consumption Energy saving Underground station Metro network Life-cycle assesmen Occupancy adaption Emitting diode System Luminaires Management Buildings Retrofits Patterns Metro -- Catalunya -- Barcelona Metro -- Estacions -- Enllumenat -- Consum d'energia Edificis -- Estalvi d'energia Enllumenat elèctric Reducing lighting electricity use in underground metro stations