Title: THE ANALYSIS OF ENERGY EFFICIENCY INDICATORS AND RENEWABLE ENERGY SOURCES FOR EXISTING BUILDINGS
Abstract: The efficiency and resources use have become the most important measures of buildings quality. The buildings are in contact with the ground and nature of which they can drain necessary energy.The aim is that amount of this energy has to be as small as possible. Investing in energy efficiency of buildings should be a priority, because it represents saving at the same time. The construction of energy-efficient buildings is increasingly relying on the application of bioclimatic sustainable postulates. The existing building stock is higher than new construction fund, so energy efficient principles are not only applied in the construction of new facilities, but also for improving energy performances of existing buildings. In the process of buildings reconstruction, in term of energy optimization, the greatest attention is given to residential buildings. Through investments in thermal insulation materials and use of renewable energy sources, the value of the building increases and a quick return on investment is enabled. One of the primary goals is to save energy for heating and cooling, to provide thermal comfort and use renewable energy sources. At the same time, it is necessary to consider a number of criteria related to the building reconstruction in term of redesign, thermal protection as well as the implementation of efficient, ecological and economically viable technical systems, and by its evaluation to define optimal solution. For making these decisions, multi-criteria analysis can be of great importance. The paper examines the problem of multi-criteria analysis in the field of improving energy efficiency of the existing buildings, as well as the possibility of selecting the optimal solution using the method of analytic hierarchy process (AHP). The aim is to identify the dominant factors for improving the performance of architectural buildings, using AHP, taking into account the aspect of energy efficiency with appropriate economic viability.