The objective of the research is to determine the quantitative influence of building envelope on the annual heating and cooling energy demand in office buildings demonstrated on a reference office-tower building located in city of Novi Sad, Serbia. The investigation intended to find preferable and applicable solutions for energy performance improvement in currently inefficient office buildings. A comparative and evaluative analysis was performed among the heating energy expenses and simulated values from the multi-zone model designed in EnergyPlus engine. The research determines an improved window to wall ratio using dynamic daylight simulation and presents the influence of glazing parameters (U-value, solar heat gain coefficient) on the annual energy performance. Findings presented window to wall ratio reduction down to 30% and point out the significance of the solar heat gain coefficient parameter on the overall energy performance of buildings with high internal loads. The calculation of the air-ventilation energy demand according to EN 15251 is included, respectively. Results offer effective methods for energy performance improvement in temperate climate conditions.

No abstract

No abstract

No abstract

Preliminary notesThe paper considers the problem of selecting the most appropriate variation for the pipeline route Beloševac -Divci within the Kolubara regional water supply system (Serbia). Variations are evaluated according to five criteria, three of which have an economic character. The problem of selecting the optimal variant for the pipeline route is solved using the multi-criteria analysis by applying the PROMETHEE method and the implementation into the software package Visual PROMETHEE 1.4. The PROMETHEE method has proved to be applicable and suitable in solving practical problems related to civil engineering, in the phase of the final decision-making in the area of construction planning. The application of multi-criteria evaluation methodology, provided in this paper, proposes the variant with the minimal construction costs. Keywords: criteria; multi-criteria analysis; pipeline routes; PROMETHEE method; variations Višekriterijska analiza varijantnih rješenja trase cjevovoda primjenom metode PROMETHEEPrethodno priopćenje U radu je razmatran problem izbora najpovoljnije varijante trase cjevovoda Beloševac -Divci u okviru Kolubarskog regionalnog sustava vodosnabdjevanja (Srbija). Varijante su vrednovane na osnovu pet kriterija, od kojih su tri kriterija ekonomskog karaktera. Problem izbora optimalne varijante trase cjevovoda riješen je višekriterijskom analizom primjenom metode PROMETHEE implementacijom u softversko rješenje Visual PROMETHEE1.4. Metoda PROMETHEE se pokazala primjenjivom i pogodnom u praktičnim problemima građevinskog inženjerstva, u fazi konačnog odlučivanja u području planiranja izgradnje. Primjenom metodologije višekriterijskog vrednovanja, danom u ovom radu, korisniku se predlaže varijanta s minimalnim troškovima izgradnje.