The main objective of the presented paper was to evaluate the integrated design strategies applied in refurbishment of the prefabricated residential housing, erected in'70 in the New Belgrade, Serbia, in order to achieve energy savings accompanied with reduction of CO2 emissions and improvement of households' health and comfort. Conducted study led to the preliminary design of energy refurbishment of the existing building, and its conversion to energy efficient building with minimized loads. Building's dynamic behavior and energy efficiency have been optimized implementing BPS-Building Performance Simulation. Very significant reduction of thermal and cooling loads with the reference to the building's existing status is obtained. Refurbishment encompassed comprehensive optimization of building's envelope structure, natural and mixed ventilation. The implementation of a series of EEI (energy efficiency improvement) measures resulted in significant reduction of buildings energy loads. The investment in energy efficiency retrofitting can improve macroeconomic stability and contribute to the sustainable economic growth. Furthermore, economic analyses were performed for each model, considering present economic situation in Serbia and availability of funds for refurbishment. Presented methodology and results of the performed analyses offer an opportunity to extend their application to other neighborhoods, exploring refurbishment potential results if applied on a greater urban scale. Economically feasible Energy Refurbishment of Prefabricated Building inBelgrade, Serbia The main objective of the presented paper was to evaluate the integrated design strategies applied in refurbishment of the prefabricated residential housing and their economic feasibility, considering current economic situation in Serbia. The aim of the study is architectural re-design using "passive" and "active" measures to improve and optimize the energy efficiency of residential buildings.Design strategies were applied in order to achieve energy savings accompanied with reduction of CO 2 emissions and improvement of households' health and comfort. By BPS -Building Performance Simulation were analyzed effects of the implementation of a series of EEI (energy efficiency improvement) measures and they resulted in significant reduction of buildings energy loads. Considering present economic situation in Serbia and availability of funds for refurbishment, by analyzing these six different energy efficiency retrofitting models, valuable inputs were obtained for further development of economic models. The results clearly prove that every retrofit scenario is economically feasible.

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The refurbishment of the existing housing stock has a twofold aim: to decrease consumption of fossil fuels and to reduce the CO2 emissions. The main focus of the presented paper is the evaluation of the integrated design approach applied in scenarios for refurbishment of the prefabricated residential multi-apartment building. The criteria used in searching for the best approach to the RES integrated refurbishment were minimized energy loads, minimized CO2 emissions and improved indoor environment quality, health and comfort. After in-depth environmental analysis, a series of EEI (energy efficiency improvement) measures were implemented, as a comprehensive optimization of the building's envelope structure, natural and mixed ventilation and source energy delivery. The building's dynamic behaviour and energy efficiency have been analyzed and optimized by the Building Performance Simulation and PV panels' integration for the Typical Meteorological Year of Belgrade, Serbia. Energy refurbishment should be approached in an organized, pragmatic and interdisciplinary way. Hence, the focus should be not only on the latest leading-edge technology, but on the synergy of different practices and principles in order to ensure the path to sustainable development and achieving desired objectives. 2 KeywordsEnergy refurbishment, prefabricated buildings, building's envelope structure, final energy, BPS -building-performance-simulations, renewable energy sources (RES)

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