Detta examensarbete har genomförts tillsammans med Umeå Energi och behandlar ett av deras kunders problem. En specifik gång- och cykelvägstunnel har varit ämne för klagomål från allmänheten på grund av att dess belysning släcks under dagtid. Under vissa perioder på dygnet upplevs tunneln som mörk och otrygg. I dagsläget styrs tunnelbelysningen tillsammans med andra delar av gatubelysningen av en ljussensor och önskemål finns att installera ett batterilager som försörjer tunnelbelysningen under den tiden som den ordinarie strömförsörjningen är avstängd. Då gatubelysningen utöver att vara avstängd periodvis över dagen även är helt avstängd under hela juni och halva juli krävdes även en solpanel för att försörja belysningen under den tiden. Solkraft valdes mycket på grund av det faktum att den producerar som mest under den tid som anläggningen inte har någon typ av fast strömförsörjning men även med tanke på kundens önskan om att jobba med förnybar energi. För att leva upp till Trafikverkets riktvärden behövdes enligt utförda mätningar bara en lite del av belysningens fulla effekt användas. Då armaturerna var förberedda för Dali och anläggningen önskades hållas så liten som möjligt föreslogs rörelsesensorer som både stänger av belysningen när det inte befinner sig någon i tunneln men även inte höjer belysningen mer än nödvändigt. Batterier dimensionerades utefter förväntad belastning och givna effektförluster. För att utvärdera solpanelens förmåga att täcka in anläggningens behov simulerades anläggningen i Polysun. De 37 kWh/månad som solpanelen på 300 Wp genererar under sommaren räcker till 14 timmar belysning per dag vilket anses räcka under den tidsperioden baserat på tunnels användning. Kretsschema med komponentlista, kabellista och en föreslagen layout producerades i PCSchematics för att visa på en typ av lösning. I övrigt rekommenderades det att måla tunneln i ljus färg för bättre förmåga att reflektera ljus. Möjligtvis skulle det kunna leda till att belysningen kan dimras ner ytterligare. / This bachelor thesis has been carried out along with Umeå Energi and addresses one of their clients' problems. A specific tunnel used for walking- and cycling traffic has been the subject of complaints from the public because its lighting is switched off during the daytime. During certain periods of the day, the tunnel feels dark and unsafe. Currently, the tunnel lighting is being controlled, alongside with other parts of the street lighting, by a light sensor. There is a desire to use battery storage to supply the tunnel lighting during the time when the power is turned off. Since the street lighting in addition to being switched off periodically throughout the day is also completely shut down throughout June and half of July, a solar panel was required to provide energy to the luminaires during that time. Solar power was chosen partly because of the fact that it produces the most amount of energy during the time the facility has no type of power supply but also in view of the customer's desire to work with renewable energy. In order to live up to the Traffic Authority's guideline values, only a small part of the power was required. The luminaires were prepared for Dali and since the facility was desired to be as small as possible, motion sensors that both turn off the lighting when there is no one in the tunnel but also does not raise the lighting more than necessary was suggested. Batteries were dimensioned upon expected load and given power losses. To evaluate the solar panel's ability to cover the luminaires needs, simulations was made in Polysun. The 37 kWh/month that the 300 Wp solar panel generates during the summer is sufficient for 14 hours of lighting per day, which is considered enough for the time period based on the tunnel usage. Circuit diagram with component list, cable list and a proposed layout were produced in PCSchematics to display one type of solution. In addition, it was recommended to paint the tunnel in a bright color to better reflect light. Possibly, it could lead to a further reduction of the illumination.

The report Stockholm city’s regional biking plan presents information of a continuously rising numbers ofcyclists in central Stockholm. However, the central parts of Stockholm have not now, or in the near future,the capacity or structure to provide a functional as well as safe traffic situation, especially for cyclists. Theincreasing demand from traffic of the commuter street network in central Stockholm make the 6 km longunderground maintenance tunnel along the newly build Citybanan commuter train tracks a possible andinteresting alternative for safe, fast and easy bicycle travelling underneath Stockholm. The tunnel stretchesfrom Fatbursparken to Tomteboda, with exits/entrances along the route in central parts of Stockholm[Fig 1.]There are several examples in the world where former car, train and maintenance tunnels are used as bikingtunnels. The longest existing example is the Croix Rousse tunnel in Lyon, France (2013). A 1,3 km longtunnel with separate lanes for cyclists, pedestrians and commuter busses, which also functions as anevacuation tunnel to the parallel car tunnel. Another example is the Lugaritz-Morland bicycle tunnel in thecity of San Sebastian, Spain (2009), which is a former railway tunnel (850 metres) that connects twoneighbourhoods in the city.The specific conditions a tunnel have with no daylight and limited access, give the lighting designer theimportant task to shape the space using light.Light is the factor that makes us see the world, our visual ability is depending on the light. Light has theability to reveal and transform the character of a space and influence how the observer experiences thesituation, both physically (by vision) and psychologically (emotional experiences as comfort and feeling ofsafety). Therefore a good visual condition in public space, traffic as well as enclosed spaces like tunnels, arevery important and a basic need for humans in the city.The aim with this thesis was to develop a lighting strategy and proposal for the maintenance tunnel ofCitybanan in Stockholm, based on literature and case studies research, a full-scale light observation by areference group in a tunnel context as well as research by questionnaires. The primary purpose of the fullscalelight study was to confirm literature research hypotheses about the importance of light distributionand experienced spatial atmosphere in relation to psychological effects, as well as the importance of lightgiving information. Findings confirm and shows that light distribution have a great impact on how theobservers experience the space visually, as well as emotionally. Findings also show that light can influencepeople’s behaviour to intuitively slow down or be alert. Further this thesis results show that giving a spaceit’s own identity by collaboration between light, colour and architectural elements have a great impact onthe psychological experiences of a space regarding safety, comfort and social interaction, crucial factors in atunnel environment for cyclists.The thesis results in a concept presented in the Proposal chapter, based on design principles and a lightingstrategy where a combination of light typologies is used to create a human centred and comfortableenvironment. Light is used as guiding element and for spatial understanding to create comfort and supportsocial interaction. In addition the concept includes a theme used as inspiration in the lighting strategy tocreate a connection on a human scale between the cyclist and the space. The theme is based on a commonpreference of the reference group, as well as my personal, for the ideal dream biking environment;In the nature. Experiencing for example the variation of light filtered through the leaves, the sunset and theabsence of traffic.The aim with the proposal is to transform the tunnel to an attractive bicycle route for daily cyclists inStockholm, as well as being an interesting tourist attraction.- A large underground landmark and art piece stretching under the city of Stockholm.