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Improvement of the energy planning process for the development of local and regional action plans
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Nikola Matak Climate change caused by human activities and their successful mitigation and adaptation to consequences is one of the crucial issues of humanity in the 21st century. One of the most common ways to tackle this issue is local and regional initiatives, which create energy plans for sustainable development. Sustainable energy planning at a local level is first time seen at some level, after the 1970s as a direct consequence of the energy crisis. A serious approach to sustainable local energy...
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Improvement of wave statistics for the prediction of long-term responses of marine structures
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Antonio Mikulić The aim of the Thesis is to explore possibilities for improvement of the
existing long-term wave statistics for the design and analysis of ships and
offshore structures. Thus, the effect of spatial correlation among successive
sea states along the shipping route, the effects of intra-annual climate variability and wave directionality, the usage of wave data from different sources,
and the practical applicability of environmental contours are explored. The
introduction of new...
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Increasing the penetration of renewable energy sources by using power to heat technologies in power systems based on coal
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Drilon Meha The transition of the coal-based energy system is a challenge that can be solved by considering the integration of variable renewable energy sources and synergic effects between electricity, heating, cooling, transport and industrial sectors. This thesis focuses mostly on the integration of variable renewables using power-to-heat technologies in district heating systems. As 70-80% of total energy consumption in buildings takes the form of heat consumed for space heating purposes, spatial...
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Indirektni nadzor istrošenosti alata i tvrdoće obratka kod bušenja kamena
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Miho Klaić Kamen je po svojoj strukturi krhak, nehomogen i anizotropan materijal, čija mehanička svojstva u zoni obrade mogu značajno varirati. Promjenjiva mehanička svojstva, poglavito tvrdoća, imaju veliki značaj kod izbora parametara obrade. Neodgovarajući parametri obrade mogu negativno djelovati na dinamiku trošenja alata, te izazvati lom alata ili obrađivanog materijala uslijed povećanih sila rezanja. Imajući u vidu nemogućnost mjerenja istrošenosti reznog alata tijekom postupka...
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Influence of design requirements on the spur gear pair parameters selection
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Daniel Miler The gear pair design is well-defined within the technical literature, resulting in a straightforward
design process. However, transmission performance largely depends on the designer’s
skill and experience. Thus, including the optimisation phase in the design process increases
the transmission value. Besides the necessary strength requirements, additional characteristics
can be ensured. The research was divided into six phases: literature review, the singleobjective
optimisation,...
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Influence of dimensional accuracy and tooth flank surface texturing on worm wheel pitting formation
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Robert Mašović Pitting of worm wheel flanks is one of the main damage mechanisms that occur in worm pairs. Due to their geometry, worm pairs are sensitive to manufacturing errors, and their influence on damage mechanisms, namely pitting, has not yet been thoroughly studied. This doctoral thesis investigates the influence of worm pair dimensional accuracy on pitting formation and development. The goal was to correlate worm pair deviations with the occurrence of pitting and to predict worm wheel flanks...
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Influence of energy policy on long term energy demand planning
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Tomislav Pukšec Long term energy goals that the EU has set for the years 2020 and 2050, in order to increase its security of energy supply, decrease the impact on the environment and stimulate sustainability, are binding to all member states. Croatia as a new EU member state needs to reconsider and develop new energy policy towards energy efficiency and renewable energy sources. One of the key processes is rational energy consumption and gradual national energy demand decrease. Having said this; it is...
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Inkrementalno toplo savijanje cijevi velikog promjera
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Ivica Novosel U radu se daje pregled postupaka savijanja cijevi u toplom stanju za zadani promjer, u
rasponu od 250 – 400 mm i debljine stijenke u rasponu od 15 – 25 mm. Obrađuje se metoda
inkrementalnog savijanja u toplom stanju, tako da se daje prikaz razvoja od prvog
inkrementalnog stroja za savijanje cijevi do današnjih rješenja. Analiziraju se karakteristike
svake faze razvoja te se u konačnici daju karakteristike idejnog rješenja stroja koji objedinjuje
prednosti strojeva iz svake...
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Integracija otpadne topline i obnovljivih izvora energije u postrojenju atmosferske destilacije nafte
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Almir Sedić Projektiranje procesa za povrat otpadne toplinske energije i implementaciju obnovljivih izvora energije provedeno je u postrojenju za Atmosfersku destilaciju nafte u okviru Rafinerije nafte Sisak, INA – Industrija nafte d.d. Zagreb. Pritom je pokazano da je racionalno korištenje toplinske energije u postrojenju moguće unaprijediti na dva načina: (i) kroz projektiranje sustava za povrat energije, te (ii) kroz ugradnju postrojenja zasnovanog na binarnom ORC‐u (Organskom Rankine‐ovom...
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Integralni model dinamičkog odziva pučinskog plutajućeg proizvodnog objekta
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Ivan Ćatipović U ovom radu razvijen je integralni model za proračun dinamičkog odziva pučinskog plutajućeg proizvodnog objekta (eng. Floating Production Storage and Off-loading). Navedeni objekt često je usidren na velikim dubinama te služi za crpljenje, rafiniranje, skladištenje i prekrcavanje nafte i plina. Integralni model opisuje gibanje pomorskog objekta u sprezi s gibanjem sidrenih linija i proizvodnih podizača (eng. marine riser). Model se rješava u vremenskoj domeni zbog izrazito...
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Integralni model za povećanje učinkovitosti javne vodoopskrbe
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Davor Poljak Javna vodoopskrba u suvremenom smislu riječi postoji tek 4.5 stoljeća. Preciznije, datira od 1544. godine, kad je engleski parlament donio zakon o osiguranju „bistre vode“ za građane Londona. Sredinom 19. stoljeća, pod utjecajem druge industrijske revolucije, gradovi se ubrzano razvijaju. Rastom broja stanovnika i gospodarskih aktivnosti raste i potreba za vodom. Razvoj vodoopskrbe dobiva snažan zamah u Zapadnoj Europi i Sjevernoj Americi. Do početka 20. stoljeća većina gradova...
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Inverzna metoda za određivanje opterećenja konstrukcijskih elemenata s pukotinom
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Ivica Cukor Za procjenu cjelovitosti konstrukcije neophodno je poznavanje opterećenja njenih komponenata i parametara pukotine. Kako se nosivost konstrukcije smanjuje tijekom njenog radnog vijeka, prisutnost pukotina može narušiti cjelovitost konstrukcije. Za praćenje rasta pukotine i stanja konstrukcije tijekom njenog radnog vijeka u radu je predložen postupak inverznog modeliranja za identifikaciju nepoznatih opterećenja konstrukcije s pukotinom. Primjenom optičke metode korelacije digitalne...
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