Solceller – Solen är ju gratis! : En undersökning av huruvida solceller är ett fördelaktigt energisystem med avseende på tekniska och ekonomiska aspekter

This report is a result of a bachelor thesis at the school of Architecture and the Built environment (corresponding to 15 HP) and is written during spring 2012 at the Royal Institute of Technology (KTH) in Stockholm. The Bachelor's essay is based on the design and dimensioning of a house which is located at a predetermined site in Malmo, Sweden. The idea is to construct a house that is appropriate to use for an average Swedish family of four family members. The house is designed in a modern way with respect to ease of access and disabled facilities. The installation that have been considered are heating, ventilation, sanitation and electricity. Construction calculations and material selection are also discussed. Furthermore, a study about photovoltaic cells has been done. The purpose of the study is to decide whether photovoltaic cells are an advantageous energy system to the house with respect to economical and technical aspects. The result of the study shows that solar cells has an efficiency of 14% and gives a surplus of electricity during the summer, the cells gives more than half the need of electricity during the spring. However, the production of electricity is low during autumn and winter. The system of the photovoltaic cells is fairly easy to install, and dose not require maintenance, however the system is expensive because the cost of investment is more than 227 000 kr. The annual saving is about 6700 kr but the investment will be profitable only after 18 years