ANALYSIS OF ENERGY AND ECONOMIC INDICATORS OF ENERGY REHABILITATION - CASE STUDY OF THE RESIDENTIAL BUILDING IN PETROVAC NA MLAVI

Abstract

The conducted research analyses the energy and economic aspect of the applied measures on the energy rehabilitation of an individual residential building in Petrovac na Mlavi and the sizing of the elements of the thermal membrane. using the methodology prescribed by the Rulebook on energy efficiency of buildings (Official Gazette of RS No. 61/2011) software package URSA building physics 2. in order to improve the procedure for selecting materials for warming the thermal membrane of the building. The economic analysis of the proposed measures is based on two elements, the first is the price for individual positions of works, materials and labor, and the second aspect is the payback period of the investment used in energy rehabilitation. The research shows that in the phase of preparing energy efficiency studies for the project of energy rehabilitation of buildings, significant savings can be made in financial costs by transferring existing buildings from energy class E, after rehabilitation to energy class C. The research shows that combining energy and economic analysis identify which variant of energy rehabilitation gives the best economic effects, in terms of current price but also the fastest return on investment. In this sense, it is possible to make savings of 3.30% to 14.69% in investment in the proposed works, through the selection of materials planned within the thermal membrane. The increase of the investment used in energy rehabilitation can be realized in 11 years and 3 months. Energy rehabilitation has reduced the need for energy used in heating the building on an annual level by 31.60%.