Energy, ecological and economic aspects of improvement of the dwelling housing in Belgrade

The main concern of this research is building refurbishment. Different possibilities of energy performances improvement of existing dwelling housing in the settlement Konjarnik, Belgrade, Serbia, are estimated from energy and economic point of view. Two hypothetical models of improvement of building envelope are created. Different solutions for reduction of energy consumption for heating of existing dwelling housing as well as reduction of CO2 emissions are considered in economic analyses. Economic analyses use BLCC (Building Life Cycle Cost) software which produces multileveled grading of building scenarios and comparative analyses of grading results. The comparative analyses take into account initial building investments and energy cost savings through certain period of building`s use. The overall behaviour of different scenarios is measured according to: (a) initial/capital investments, (b) energy costs (c) operating, maintenance, and repair (OM&R) costs and (d) capital replacement costs. Results of the analyses are used as quantitative inputs for investment decision making

Energetski aspekt obnove prefabrikovanih stambenih objekata u Beogradu

Mnoga prigradska naselja su izgrađena u Beogradu posle Drugog svetskog rata. Zbog loših energetskih performansi, prisutna je visoka potrošnja energije za grejanje i hladjenje i emisija CO2. Jedan od predstavnika takve stambene arhitekture je naselje Konjarnik. Procena različitih scenarija za poboljšanje energetskih karakteristika montažnih višeporodičnih objekata u Konjarniku je sprovedena u radu. Hipotetički modeli unapređenja energetskih performansi omotača postojeće zgrade su kreirani u cilju smanjenja energetskih zahteva za grejanje, a time i smanjenja emisije CO2. Analizom troškova održavanja kroz životni ciklus zgrade procenjena je efikasnost mera obnove u pogledu izvodljivosti, ekonomičnosti i uticaja na životnu sredinu

Design of solar systems for buildings and use of BIM tools: Overview of relevant geometric aspects

The paper systematizes geometric aspects relevant for understanding design of solar systems. The systematization is based on a review of literature dedicated to various kinds of engineers, including architects, involved in a multidisciplinary process of conceptualizing, designing and realization of PV systems. The understanding of the presented geometric aspects, known as solar geometry, is important not only in terms of finding optimal orientation and most effective tilt of solar modules, but also in terms of adequate geometric modelling of façade elements of a complex shape (as specific photovoltaic modules) in order to be optimally exposed to the sun all over the year. After providing detailed explanations of the main elements of solar geometry using the tools of spherical trigonometry, the paper discusses the integration of the presented geometric concepts in the BIM environments, and refers the example of Autodesk Revit software through its sun study tool. Analysed are functionalities of all interactive components of the 3D solar path representation. A need for more explicit determination of an incidence angle of the sun rays on a tilted surface is stressed. In the conclusion highlighted is the essential knowledge on solar geometry that needs to be acquired during architectural education, so that architects participating in the BIM working environments could be prepared for efficient conceptualization of integrated solar systems