As a requirement of the modern society, renewable and clean energy systems are being developed. Following this trend, urban energy systems are being studied and installed. The following study has for aim to check the possibility of install two wind turbines on the top of the roof of the Lakerol Arena situated in the city of Gavle, Sweden. For this, several data have to be measured in order to calculate the maximum output possible to get, the optimal point of the roof and the kind of turbine used. The measurement of all these data has been processed in the wind tunnel of the University of...