## 1 Introduction  
Population growth in urban areas has triggered the search for sustainable techniques of energy consumption in buildings [1; 2; 3]. It is necessary to prioritize energy efficiency and integrate renewable energy sources in buildings to achieve EU goals [4]. Buildings are responsible for 40% of the total energy consumption across the EU, and the share of energy-inefficient buildings is 36%, mainly due to their age, which is over 50 years [5; 6; 7]. Energy management in buildings is associated with the idea of controlling different energy sources and loads in an efficient and optimized manner with one purpose: to reduce energy costs by measuring the energy demand of the load and the production of renewable energy sources locally in real time [8; 9]. On-site energy generation has several advantages not only in environmental terms but also in economic and technological terms, such as reducing energy losses in the power grid and enhancing the autonomy and decision-making power of individual consumers, leading to a decrease in the balance of energy imports [10; 11]. The integration of wind systems in urban environments must consider the maximization of renewable energy generation in cities and minimize negative impacts on health and the local environment to ensure the essential energy needs of all those who live and work in these areas [12]. Distributed power production in urban areas is a remarkable contribution to the design of new sustainable buildings concerning energy consumption, produced directly where the energy demand is sought [13]. In addition to this growing interest in installing local generation in cities, small wind turbines also gain a focus of interest in the understanding of their potential in an urban environment [14]. Local electricity generation in buildings by wind turbines (WT) involves many different challenges in comparison to stand-alone wind energy systems and wind farms. It is known that the wind profile in an urban environment is very complex, and the adaptability of wind turbines to this environment is not sufficiently known, neither in terms of productivity nor in terms of compatibility with the building's structure. The high terrain roughness length and the presence of obstacles with different shapes strongly influence the air stream for wind power use. However, disturbed flows around buildings can locally increase wind speed, and energy yield can be increased in comparison to open locations. As the energy efficiency of WTs depends on the cubed wind speed, an increase in wind speed due to the surrounding buildings can make the turbines favourable to the wind [12; 13; 14]. Small wind turbines integrated into buildings are low-cost renewable energy sources Stankovic2009. Despite their potential, [PERSON] and co-authors [PERSON] pointed out that the reasons for the limited installation of micro wind turbines in urban areas are the low average wind speed in these areas, the high levels of turbulence, and the relatively high levels of aerodynamics noise caused by the turbines. [PERSON] [15; 16] noted that if a turbine is installed in the wrong location on the roof of a building, power can drop to zero for significant periods, even when wind speeds are relatively favourable for energy production. The effort to optimize flow simulation models for different species should be valued. The potential of a CFD-based design practice that has wide application in developing the most varied processes and equipment results in a huge reduction in costs and expenses compared to conventional practices [17]. In addition, to achieve great efficiency in the use of energy in buildings, the integration of renewable energy sources in an optimized manner is crucial [6].