Recently, the European Union set new rules for the Energy Performance of Buildings emphasizing the need to facilitate the cost-effective renovation of existing buildings into nearly zero-energy buildings (nZEB). Within this framework, the aim of this paper is to investigate and evaluate the energy performance of existing public buildings before and after renovation into nearly zero-energy buildings. Since the general quality of existing buildings in Croatia has changed over different periods of construction, the presented research was conducted on a representative nursing home designed corresponding to different Croatian national building stock construction periods, based on a public sector buildings database obtained from the Croatian Energy Management Information System (EMIS). The thermal performance of the building envelope was designed to correspond to the periods of buildings built up to 1940, between 1941 and 1970, and between 1971 and 1980, taking into account characteristic building construction technology and service life. In terms of adopted energy efficiency measures, for all nearly zero-energy building renovation solutions, an energy and cost analysis was performed. The results showed that construction technology applied in different construction periods has the greatest impact on the energy performance of a building and thus on the economic and financial viability of investment in nZEB.

The comparison of the traditional (budget-funded) public building procurement model with the public private partnership (non-budget funded) model is presented in the paper. Public service buildings procured based on the traditional model and those procured according to the PPP model are compared in the scope of research involving nine buildings realized in the Republic of Croatia. The results point to greater efficiency of the PPP model in the construction of public service buildings, with regard to both cost and time of construction work. Utjecaj načina financiranja na troškovno-vremenske aspekte javnih i društvenih građevinaU radu je prikazana usporedba tradicionalnog (proračunskog) modela nabave javnih i društvenih građevina s modelom javno-privatnog partnerstva (neproračunski model). Istraživanjem kojim je obuhvaćeno devet izgrađenih građevina s područja Republike Hrvatske, usporedno su analizirane javne i društvene građevine isporučene tradicionalno i po modelu JPP-a. Rezultati pokazuju veću efikasnost JPP modela u izgradnji javnih i društvenih građevina unutar planiranog proračuna i roka građenja. Ključne riječi: tradicionalni model nabave, JPP, javne i društvene građevine, troškovi, rok građenja Übersichtsarbeit Ksenija Tijanić, Diana Car-Pušić, Ksenija Čulo Auswirkungen der Art der Finanzierung auf die Kosten-Zeit-Aspekte öffentlicher und sozialer BautenIn der Abhandlung wird der Vergleich des traditionellen (Haushalts-)Modells der Beschaffung öffentlicher und sozialer Bauten mit dem Modell der öffentlich-privaten Partnerschaft (Nicht-Haushalts-Modell) dargelegt. Bei der Untersuchung, mit welcher neun errichtete Gebäude auf dem Gebiet der Republik Kroatien umfasst wurden, wurden parallel öffentliche und soziale Bauten, die auf traditionelle und nach dem ÖPP-Modell ausgeliefert wurden, analysiert. Die Ergebnisse zeigen eine höhere Effizienz bei den ÖPP-Modellen beim Bau öffentlicher und sozialer Gebäude innerhalb des geplanten Haushalts und der Baufrist.

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In this paper, a comparison between a conventional flat roof and an intensive green roof was made. Emphasis was on thermal conductivity of individual layers, the calculation of thermal resistance, and calculation of the thermal transmittance coefficient through both roof variants. The calculations for the two analysed roof variants were made for a building located in the town of Rijeka on the Adriatic coast. This paper also presents the construction technology comparison of the analysed roof variants. The construction cost was also analysed for both roof variants together with time needed for the execution of variant solutions. Finally, maintenance plans for both roof variants were presented in this paper. The results show that the construction costs of an intensive green roof are higher than the construction costs of a conventional flat roof and that the maintenance of the intensive green roof is more complex. On the other hand, the results of the analysis also show that constructing a green roof will result in more energy savings in the long term than in the case of constructing a conventional flat roof. In addition, there are several other benefits that go in favour of constructing an intensive green roof. Most prominent among those benefits are environmental and social benefits.

Infrastructure is a broad term encompassing a wide range of facilities from roads and railway lines to wind, waste and water projects, oil and gas facilities, pipelines and processing plants. Whilst infrastructure construction contracts have key provisions in common, there is no one standard form that fits all projects. Any standard form will need to be tailored to suit the demands of the projects, the risk profile of the parties and comply with the legal jurisdiction of the contract and project location. Increasingly contractors are enhancing their expertise and working on infrastructure projects internationally. As a result, the forms of construction contracts used are becoming more standardized. Nowadays, FIDIC forms of contract are intended to be suitable for projects carried out around the world by all types of employers with the extensive support of large investors such as the World Bank or the European Union. The terms of the Conditions of Contract for Construction have been prepared by the Fédération Internationale des Ingénieurs-Conseils (FIDIC). Two most frequently used FIDIC models of construction contracts are Conditions of Contract for Construction (known as Red Book) and Conditions of Contract for Plant and Design-Build (known as Yellow Book). These general conditions are also used as contract conditions in Croatia for public procurement of transport infrastructure projects. The use of FIDIC General Conditions of Contract in the realization of transport infrastructure construction works in Croatia is presented in the paper.