Influence of Orientation of Buildings Facades on the Level of Solar Energy Supply to Them

Energy-efficient building forms take into account the fundamentals given for passive houses and zero energy houses. One of them is to account for the amount of solar energy received on the facade surface. The paper describes the study of the influence of the orientation of buildings facades on the level of solar energy supply to them. The paper presents theoretical dependencies for determining the amount of solar energy input to the facade surface due to its orientation relative to the sides of the horizon. In addition to the appropriate orientation of houses for the use of solar energy, the paper considers the need to use this energy by equipment on walls or windows. It was calculated that the difference in solar energy received by the surface of the Southern, South-East and South-West is no more than 5%. The paper suggests approximation equations that allows to calculate the amount of solar energy received on the different orientation facade surface.