Прегледај по Аутор "Halilović, Velid"
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- СтавкаANALIZA OSJETLJIVOSTI SNABDIJEVAČKIH LANACA DRVNIM PELETOM ZA REALNE USLOVE KOJI ODGOVARAJU BOSNI I HERCEGOVINI(Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2018) Vasković, Srđan; Radović, Zoran; Batinić, Krsto; Halilović, Velid; Gvero, Petar; Gajić, Anto; Mrkić, Maja Bosančić; Golubović, Dušan; Košarac, Aleksandar; Jeremić, DejanBiomasa predstavlja značajan obnovljivi resurs. Posebno ako se njenom korišćenju prilazi sistematski i uz dobro planiranje. Drvna biomasa je najznačajniji predstavnik biomase koji se već uveliko koristi u proizvodnji peleta. S obzirom da je veliki broj mašina, postrojenja, ljudi i opreme uključen u proizvodni lanac peleta, potrebno je ustanoviti koji to faktori i koliko utiču na ovaj proces. Prije svega misli se na konačno formiranje cijene drvnog peleta i njegove zavisnosti od drugih energenata, cijena sirove biomase, transportnih distanci, cijene električne energije i slično. Ovaj rad je spojio proizvodni lanac peleta sa postrojenjem i distribucijom toplote u objekat preko odgovarajućeg matematičkog modela. Upravo smo u prošle dvije godine bili svjedoci nedostataka drvnog peleta i naglog porasta njegove cijene na tržištu. To svakako dodatno promoviše ovu problematiku i daje joj smisao za istraživanje. Postavlja se pitanje šta su realni uslovi pri kojima treba da dođe do povećanja cijena peleta na tržištu i za koliko? Odgovore na to daje ovaj rad.
- СтавкаApplication of Multi Criteria Decision Making for the Selection of Optimal Solid Wood Fuel Supply(Faculty of Electrical Engineering, University of East Sarajevo, 2018) Vasković, Srđan; Gvero, Petar; Batinić, Krsto; Halilović, Velid; Medaković, Vlado; Musić, JusufProduction of solid fuels from wooden biomass is defined with appropriate energy chain of supply. The notion of energy chain concept has been defined as the trajectory of energy transformations from the fuel source or energy sources to useful energy form to end users. Supply chain for production solid fuels from wooden biomass is also energy chain with high importance in biomass energy planning. In this paper, base for testing and research is developed mathematical model in previous published paper with preliminary note titled as “Multi-Criteria Optimization Concept for the Selection of Optimal Solid Fuels Supply Chain from Wooden Biomass“ at Croatian Journal of Forest Engineering. Three supply chains have been included in comparison: production of wood chips at the terminal – variant 1, production of pellet – variant 2 and production of wood chips by means of a mobile chipper in a forest – variant 3. The VIKOR methodology is used for total ranking all mentioned chains. Real input data have been used for mathematical calculation correspond to Bosnia and Herzegovina conditions.
- СтавкаENERGETSKI INDEKS PROIZVODNJE DRVNOG ČIPSA(Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2016) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Ikić, Marko; Ašonja, Goran; Marković, Biljana; Antunović, RankoProizvodnja čvrstih biogrova definisana je odgovarajućim energetskim lancem snabdijevanja. Proces proizvodnje čvrstih goriva iz drvne biomase počinje sa tehnologijama za skupljanje drvnog ostatka, počev od obaranja stabla pa sve do sistema za preradu (za usitnjavanje, drobljenje, sušenje, presovanje ukoliko se pravi briket ili pelet). Efikasnost proizvodnje drvnog čipsa je u relaciji sa ukupnom uloženom energijom po 1 kWh donje toplotne moći proizvedenog goriva. Ovaj rad će prikazati analizu ukupno uložene energije u snabdijevačkom lanacu proizvodnje drvnog čipsa u funkciji od transportnih distanci i vlage u drvetu. Model za analizu energetskog indeksa proizvodnje drvnog čipsa urađen je u softverskom paketu Mathcad.
- СтавкаENERGY INDEX FOR THE PRODUCTION OF WOODEN CHIPS(University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2015) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Ikić, Marko; Jokić, Srđan; Kalabić, DraganaProduction of solid fuels from wooden biomass is defined with appropriate energy chain of supply. Procedure for production of solid fuels from wooden biomass, starting with technology for gathering wooden residues and residues from logging up by the system of fuels production (system for milling, crushing, chopping, drying and pressing of wooden residues), presents energy chain of supply with solid fuel from biomass. Efficiency of production wooden chips is the relation of overall invested energy per 1 kWh of lower heating value of produced fuel. This paper will analyze total invested energy in supply chain for production wooden chips as a function transport distance and wood moisture. Paper will mathematically describe chain of wooden chips production from forest transported to the sawmill and to the terminal of processing. Mathematical model for calculation energy index developed in Mathcad software.
- СтавкаFEASIBILITY STUDY FOR REPLACEMENT HEATING SYSTEM ON NATURAL GAS WITH PELLET BOILERS AT PRIMARY SCHOOL “ST. SAVA” IN EAST SARAJEVO(University Politehnica Timisoara, Faculty of Engineering Hunedoara, 2016) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, VelidThis study describes the possibility of installation of pellet boilers for the production of thermal energy for heating in the primary school “Sveti Sava” in Lukavica. Existing heating system with natural gas turned out to be very expensive with high costs in terms of consumption of natural gas on annual level but also due to the high price of natural gas. Alternative possibility of heating premises within the school is seen in the installation of boilers that use wood pellets as an energy source. Above all, wood pellet represents an environmentally clean fuel in terms of CO2 emissions, but also because of the availability of resource from nearby factories that produce pellets, it can be used as a domestic fuel. In this way, the story of sustainable community development is encouraged, as well as the flow of capital within the community is closed.
- СтавкаFEASIBILITY STUDY FOR REPLACMENT HEATING SYSTEM ON NATURAL GAS WITH PELLET BOILERS AT PRIMARY SCHOOL "SVETI SAVA " IN LUKAVICA(Mašinski fakultet, Univerzitet Istočno Sarajevo, 2014) Vasković, Srđan; Gvero, Petar; Medaković, Vlado; Halilović, Velid; Milić, Davor; Marković, Biljana; Antunović, Ranko; Kraišnik, MilijaThis study describes the possibility of installation of pellet boilers for the production of thermal energy for heating in the primary school "Sveti Sava" in Lukavica. Existing heating system with natural gas turned out to be very expensive with high costs in terms of consumption of natural gas on annual level but also due to the high price of natural gas. Alternative possibility of heating premises within the school is seen in the installation of boilers that use wood pellets as an energy source. Above all, wood pellet represents an environmentally clean fuel in terms of CO2 emissions, but also because of the availability of resource from nearby factories that produce pellets, it can be used as a domestic fuel. In this way, the story of sustainable community development is encouraged, as well as the flow of capital within the community is closed .
- СтавкаKOMPARACIJA EMISIJA CO2 ZA SNABDIJEVAČKE LANCE GORIVIMA OD DRVNE BIOMASE I UGLJA(Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2016) Mrkić, Maja Bosančić; Vasković, Srđan; Gvero, Petar; Halilović, Velid; Petrović, Daliborka; Marković, Biljana; Antunović, RankoPotrošnja fosilnih goriva za aktiviranje mehanizacije za prikuplјanje, transport i preradu biomase u neku vrstu čvrstih goriva stvara određenu količinu uglјen – dioksida (CO2) koja se emituje u atmosferu. S druge strane ako se posmatra jedan snabdijevački lanac energijom iz fosilnog goriva (uglja) tada imamo isto sličnu situaciju što se tiče emisija za aktivaciju mehanizacije. Međutim, ključna razlika je u tome što sagorijevanje biomase u nekom postrojenju tretira se kao CO2 neutralno, dok se kod sagorijevanja uglja uzima ekvivalentna vrijednost emisije CO2 jer se u pitanju fosilno gorivo. Ovaj rad vrši komparaciju emisija koje se pojavljuju u ova dva tipa energetskih lanca.
- СтавкаMulti-Criteria Optimization Concept for the Selection of Optimal Solid Fuels Supply Chain from Wooden Biomass(Sveučilište u Zagrebu Fakultet šumarstva i drvne tehnologi, 2015) Vasković, Srđan; Halilović, Velid; Gvero, Petar; Medaković, Vlado; Musić, JusufProduction of solid fuels from wooden biomass is defined with appropriate energy chain of supply. Production procedure of solid fuels from wooden biomass, starting with technology for gathering wood residues and residues from logging up by the system of fuel production (system for milling, crushing, chopping, drying and pressing of wood residues), represents the energy chain of supply of solid fuel from biomass. Every single energy chain of supply and production of certain form of solid fuel from wooden biomass can be uniquely defined with three general criteria. These criteria are: energy efficiency of production, economy of production and environmental criteria. Efficiency of production is the relation of overall energy consumption per 1 kWh of heating value of produced fuel. When we talk about the economical aspect of production of solid fuels we take into account all production costs per 1 kWh of heating value of biofuel produced. Forest biomass is scattered and the need for its collection and transport require certain consumption of fossil fuel. Consumption of fossil fuel is needed to run mechanization to collect, transport and prepare biomass. Consumption of fossil fuels causes the emission of GHG. Ecological criteria for the estimation of production process of bio energy can be defined as emission of GHG per 1 kWh of heating value of produced fuel. Besides general criteria to estimate the quality of production of energy from biomass, there are specific criteria. Specific criteria regarding several characteristics are tightly related to applied technologies, potentials and barriers during the use of biomass. This paper analyzes only specific investment in selected chain of energy supply. The paper mathematically describes four characteristic cases of solid biofuel production from wooden biomass. These cases are: production of wooden chips from forest biomass with mobile chipper, production of wooden chips from wooden residues transported from sawmill to processing terminal, production of wooden briquette from mill residues transported into briquette factory, production of wooden pellet from mill residues transported into pellet factory. For overall ranking of energy chain of wooden biomass supply and selection of optimum variant, multicriteria optimization and VIKOR method is used.
- СтавкаODREĐIVANJE TEŽINA KRITERIJUMA U PROCESIMA OPTIMIZACIJE ENERGETSKIH LANACA GORIVA BAZIRANIH NA DRVNOJ BIOMASI(Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2022) Vasković, Srđan; Gvero, Petar; Simić, Stojan; Krunić, Gojko; Halilović, Velid; Popović, Slavenko; Mrkić, Maja BosančićVrednovanje procesa proizvodnje energije iz različitih resursa predstavlja kompleksan zadatak. Taj zadatak mora uzeti u obzir različite tehnologije, manje ili veće proizvodne i investicione troškove, štetne uticaje na životnu sredinu (obnovljivi ili fosilni izvori energije), zatim energetske specifikacije posmatranih lanaca snabdijevanja gorivima i energijom. Višekriterijumska analiza i optimizacija je metodologija koja se bavi u opštem slučaju vrednovanjem skupova različitih alternativa. Kao takva, ova metodologija je idealna za pronalaženje optimalnih varijanti snabdijebanja energijom za usvojeni set kriterijuma prema kojima se vrši proces optimizacije. Za izbor optimalne varijante potrebno je ustanoviti adekvatne težine kriterijuma iz postojećeg skupa alternativa. Postoje različite metode za izbor težinskih faktora koje su uglavnom svedene na subjektivne i objektivne metode ili njihovu kombinaciju. U ovom radu koristiće se objektivna Metoda Entropije za određivanje težina kriterijuma za proces višekriterijumske optimizacije i njen uticaj na izbor optimalnog lanca snabdijevanja u odnosu na varijantu ujednačenih težinskih koeficijenata. Razlog za njenu primjenu se svodi na objektivnost prilikom donošenja odluka i isključivanje donosioca odluke iz tog procesa.
- СтавкаPOSTROJENJA ZA PROIZVODNJU SEKUNDARNIH ENERGENATA OD DRVNOG OTPADA – KAPACITETI I MOGUĆNOSTI NA PODRUČJU ZENIČKO – DOBOJSKOG KANTONA(Mašinski fakultet Istočno Sarajevo, Univerzitet u Istočnom Sarajevu, 2018) Halilović, Velid; Vasković, Srđan; Musić, Jusuf; Knežević, Jelena; Balić, Besim; Softić, Jasmin; Golubović, Dušan; Košarac, Aleksandar; Jeremić, DejanUtvrđivanje kapaciteta proizvodnje sekundarnih energenata na području Zeničko-dobojskog kantona pruža važno uporište za detaljnije i racionalnije planiranje korištenja drvnog otpada iz različitih izvora, koji nastaje na navedenom području. U ovom radu istražene su i prikazane prednosti korištenja sekundarnih energenata u odnosu na fosilna goriva, i to sa ekonomskog, ekološkog i energetskog aspekta. U cilju prikupljanja podataka kreiran je anketni upitnik sa konkretnim pitanjima vezanim za proizvodnju sekundarnih energenata na koja su odgovore dali odgovorna lica subjekata koji su obuhvaćeni istraživanjem. Rezultati rada pokazuju da potencijal proizvodnje sekundarnih energenata na području Zeničko-dobojskog kantona ne koristi se na zadovoljavajućem nivou. Maksimalni kapaciteti proizvodnje se ni približno ne ostvaruju. Zaključci govore da je proizvodnja cijepanog drveta tek 49% od maksimalnog kapaciteta, peleta i briketa oko 60%.