There is a large potential in making the residential and service sector more energy efficient and the first step towards achieving a more efficient use of energy is to implement an energy audit. In this study a property with an approximate area of 8 000 m2, consisting of a main building and three building extensions from different eras has been examined. The main building and its extensions were built in different stages and the first one in the early 20th century and some parts of the last building extension were modified at the time that the examination was carried out. This indicates that there is a vast energy savings potential in the property and an energy audit was performed. The main aim of the study was to examine where the energy was being used and where energy could be saved. Energy saving measures has been suggested together with a calculated approximate energy decrease and payback period. The total energy savings potential for the measures is approximately 146 MWh. The energy audit showed that a large amount of electricity was being used during non-work hours and that energy was lost through the building envelope. The electricity use during non-work hours was examined during the night walk, however, it is suggested to carry out further examinations regarding the property’s vast electricity use during non-work hours. To add loose wool in the roof of B2 has an energy savings potential of 33 000 kWh/year. Another measure is to clean the heat exchangers, this measure has an energy savings potential of 26 000 kWh/year. Also it is suggested to optimize the operational hours for the lighting by implementing presence control and to decrease the energy use for ventilation by cleaning the heat exchangers. Further examinations that would improve the study would be to do measurements of the electricity and temperatures to get a better understanding of the buildings energy use. Also to model the building in a simulation tool would give a calculated energy loss that is more like the actual energy loss of the building and make the results more reliable.

I detta examensarbete utreds förutsättningarna för solcellsdriven belysning som belysningsalternativ för gång- och cykelvägar på landsbygden. Det finns gång- och cykelvägar i landsbygden som sällan trafikeras, detta gör att kommuner och vägföreningar lämnar dem utan belysning. Därför är det önskvärt att kunna erbjuda en belysningsteknik som har noll elkostnader och ingen kabeldragning. Studiens hypotes var att solcellsdriven belysningsanläggningar kan rekommenderas som gatubelysning för gång- och cykelvägar på landsbygden. Resultaten visar att Sveriges låga solinstrålning är den största utmaningen för att öka investeringsviljan hos kommuner och vägföreningar. För att öka energibesparing hos solcellsdriven belysning behövs därför avancerad närvarostyrd teknik. Tidigare installerad solcellsbelysning har visat positiv resultat. Resultaten visar också att belysningsanläggning med närvarostyrd solcellsbelysning kan ge en ekonomisk besparing på upptill 58 % jämfört med en nätansluten LED-belysning. Besparingen varierar beroende typ av solcellsbelysning som används i belysningsanläggningen. Solcellsdriven belysningsteknik minskar också koldioxidutsläpp. / In this thesis the solar-powered lightning are investigated as lightning options forwalk and cycle paths in countryside. Rarely used walk and bicycle paths in thecountryside are left without lighting by municipalities and roads associations.Therefore, it is desirable to offer a lightning technology that has zero electricitycosts and no cable routing. The study’s hypothesis was that solar-powered lightning installations can be recommendedas street lightning for walk and cycle paths in the countryside. resultsshow that solar radiation in Sweden is low which makes it difficult for Sweden’smunicipalities and associations willing to invest. To increase energy savings insolar lighting system, advanced presence-controlled technology is needed. The results show that presence-controlled solar lightning can provide an economicalsaving of 58 % compared to a LED network connected lightning. The savingvary depending on the type of solar lightning used. Solar LED street lighting technologyalso reduces carbon dioxide emissions.