## 1 Introduction  
The purpose of this research is to study building facades and the use of sunlight to increase the energy independence of buildings. The reasons for selecting building facades as a research subject are, firstly, the limitation that existing studies have been conducted mainly on the rooftops of buildings [1; 2; 3; 4] and, secondly, to utilize the wide facade of the building to produce the maximum amount of renewable energy. This study considered the fact that a solar panel can be moved according to its optimal tilt angle every month in order to maximize the generation of renewable energy. By moving on the facade of the building, the angle of the solar panel can be controlled, also representing an element of new architectural design by being placed on the facade of the building. The kinetic solar panel developed in this study and the simulation of renewable energy generation produced by the solar panel were implemented with digital technology. Digital technologies are being increasingly applied in the architectural field, wherein architectural designs are created using various computer programs. Designers implement virtual buildings using computer programs during the initial stages of architectural design. Designing a building in virtual reality aims to consider different variables, such as the complex elements required for constructing a building and the given conditions. The method of designing by establishing relationships, dependencies, and interactions with data is called parametric design [5; 6; 7]. Parametric architectural design is used not only in the external design of buildings, but also to solve serious contemporary environmental problems. The building sector consumes a significant amount of energy, accounting for 30% of global energy consumption [8]. From this perspective, architectural design to increase energy independence is considered from the initial stages of design, and parametric design is used for this purpose [9; 10; 11; 12]. To this end, parametric design first utilizes the available natural energy, which is a passive architectural design method. Parametric design is also used to derive the optimal building shape, such that sufficient solar energy can reach the interior of the building [13; 14]. These approaches should be used in the early stages of architectural design, so that an optimized building form that can utilize the maximum natural energy can be formulated. Additionally, passive design actively converts natural energy into usable energy through special devices, which is a voluntary architectural design method. Energy harvesting is a technology that actively produces renewable energy from natural sources [15; 16], mainly leveraging solar and wind power to produce renewable energy. Solar energy is utilized through solar panels and wind power is utilized via wind turbines and fine vibrations generated by the wind [17; 18; 19; 20]. When such energy harvesting technology is applied to buildings, parametric design is utilized in all architectural design processes. The variables for the parametric design of representative buildings are the surrounding building types, building site location, and climate conditions. Thus, parametric design in the field of architecture refers to the process of realizing a single building in virtual reality through the interaction of different variables related to the building. In this study, we aim to realize an architectural design using parametric design to increase the energy independence of buildings. A special device was developed on the facade of a building to incorporate solar-based energy harvesting. The special device is designed such that it moves according to the optimal solar panel angle every month to maximize the production of renewable energy. Such flexible solar panels can be differentiated from solar panels fixed at a certain angle.