Assessment of exergy for renewable energy disposable in the site of building

Abstract

Future energy challenges to construct near zero energy buildings and to have a centralized network together with integrated distributed generation from local disposable renewable energy (LdRe) raises new goals of a complex approach to energy supply. In the context of the current scientific sector, a single comprehensive approach to the general LdRe is missing. Following the typical way, all buildings are planned or designed in light of the energy needs of the intended activities in the buildings and only after the determination of these activities are the points and forms of energy supply planned. This article presents another approach in the planning process – a building and its energy needs planning taking into account the LdRe. It also provides the universal system describing the quantity and quality of LdRe. This research includes LdRe flows’ assessment, with the building, as LdRe energy user flows linking to the user only as a potential user of this energy. The exergy analysis method is used to determine the LdRe indicator. Actually determined main renewable energy (RE) flow’ (solar, wind, soil and air) values are used for the calculations. Standard 1 ha land plot area and set volumes above the land surface and beneath it are analyzed. After determination of disposable RE flows exergy quantity of the exergy change in the period of half year, one typical month and day is depicted.