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1.
Evaluation of system for economically viable thermal power plant operation
Martin Bricl, Jurij Avsec, 2019, original scientific article

Abstract: Taking into consideration the impacts of global warming and strict European Union policy 2030 climate & energy framework, it is imminent for conventional thermal power plants to modernize their infrastructure for achieving economically viable operation on demanding electricity market. In the scope of the paper is presented author%s individual research work - economic evaluation of conventional thermal power plant operation with solar central receiver system and flue gas desulphurization installation. The goal of research work is to determine whether the designed model is profitable on current European electricity market or not. Based on analytical calculations and gathered numerical data for the designed model, a program code was generated in mathematical environment Matlab, that enables simulation of operation for the designed model in the annual time period. Positive and pessimistic scenarios were analyzed. Results are presented numerically and also graphically and show a positive contribution to the economically viable operation of conventional thermal power plants.
Keywords: thermal power plant, economically viable operation, a solar central receiver system, renewable technologies, flue gas desulphurization
Published in DKUM: 22.02.2024; Views: 219; Downloads: 11
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2.
Application of gas condensing boilers in domestic heating
Marija Živić, Antun Galović, Jurij Avsec, Antun Barac, 2019, original scientific article

Abstract: A growing number of households have had condensing boilers built in to be used for the heating of spaces and for the hot water supply. The use of condensing boilers is justified from the point of view of energy because they achieve higher thermal efficiency than traditional boilers. Condensation of water vapour occurs in the flue gases, whereby the heat released by condensation is used to heat the water in the boiler. How much water vapour will condense depends on the temperature to which the flue gases are cooled. In this paper, a thermodynamic analysis of thirteen built-in gas condensing boilers was performed; data on the flue gas composition and temperature, as well as on the excess air required for combustion were obtained for that purpose. The calculation results consisting of the amount of condensed water, the thermal efficiency of the boiler, and the volume flow rates of the air and fuel are presented in tables. The analysis identified the cases in which the water vapour condensation occurred and determined the amount of the condensed water. The cases without water vapour condensation were also identified.
Keywords: gas condensing boilers, thermodynamic analysis, thermal efficiency of the boiler
Published in DKUM: 22.02.2024; Views: 174; Downloads: 8
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Načrtovanje sistema centralnega ogrevanja hiše : diplomsko delo
Zoran Popović, 2023, undergraduate thesis

Abstract: Učinkovita raba energije je izjemno pomembna za zmanjševanje energetskih potreb v stavbah in ključna v boju proti podnebnim spremembam, pri trajnostnem razvoju ter prehodu v nizkoogljično družbo. V diplomski nalogi so predstavljene različne vrste sistemov centralnega ogrevanja, opisane so njihove značilnosti ter osnovne komponente. Praktični del diplomske naloge zajema zasnovo sodobne stanovanjske hiše in načrtovanje energetsko učinkovitega sistema centralnega ogrevanja z lesno biomaso. V praktičnem delu naloge je vsebina osredotočena na analizo energetske učinkovitosti, določitev potrebne toplote za ogrevanje ter izračun projektne toplotne moči s pomočjo programskih orodij KI Energija in Audytor 7.0 PRO. Pridobljeni rezultati izvedenih analiz bodo ključni za sam postopek načrtovanja sistema centralnega ogrevanja. Usklajenost teoretičnih konceptov in praktičnega izvajanja omogoča celovit vpogled v proces načrtovanja ter obravnavo ekonomskih in energetskih vidikov sistema centralnega ogrevanja.
Keywords: energetska učinkovitost, sistemi centralnega ogrevanja, načrtovanje, KI Energija, Audytor HL
Published in DKUM: 18.01.2024; Views: 225; Downloads: 25
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5.
Izraba plitve geotermalne energije za ogrevanje in hlajenje v sklopu Zdravstvenega doma Domžale : diplomsko delo
Matija Matičič, 2023, undergraduate thesis

Abstract: V diplomskem delu obravnavamo različne možnosti izrabe plitve geotermalne energije za ogrevanje in hlajenje stavbe ter pripravo STV na primeru zdravstvenega doma. Za zagotovitev potrebne energetske oskrbe smo določili predvideno rabo energije za obstoječo stavbo ter za predvideno širitev. Predstavili smo tehnične rešitve za izkoriščanje podzemne vode, izkoriščanje toplote v sklopu gradbenih konstrukcij podzemne garaže in izkoriščanje z geosondami. Ugotovili smo, da bi lahko energetske potrebe pokrili s toplotnimi črpalkami, za rezervo in pokrivanje v času nižjih temperatur pa bi uporabili obstoječi kotel. S tem bi pomembno vplivali na povečanje deleža OVE in zmanjšanje emisij TGP v lokalnem okolju.
Keywords: plitva geotermalna energija, toplotna črpalka, zdravstveni dom, energetska oskrba, obnovljivi viri energije
Published in DKUM: 18.01.2024; Views: 219; Downloads: 9
.pdf Full text (4,69 MB)

6.
Zamenjava obstoječega ogrevalnega sistema v industrijskem objektu z VRF sistemom : diplomsko delo
Gašper Škoflek, 2023, undergraduate thesis

Abstract: V diplomskem delu obravnavamo zamenjavo obstoječega ogrevalnega sistema toplotna postaja z VRF sistemom. Računsko določimo toplotne izgube stavbe in določimo potrebno velikost in moč VRF sistema. Naredimo izračun letnih stroškov starega in novega ogrevalnega sistema ter upravičimo ali ovržemo načrtovano zamenjavo.
Keywords: ogrevanje, hlajenje, toplotne izgube, VRF sistem
Published in DKUM: 16.01.2024; Views: 193; Downloads: 8
.pdf Full text (2,68 MB)

7.
Primerjava conskega hlajenja med adsorbcijsko in kompresorsko toplotno črpalko : magistrsko delo
Klemen Umek, 2023, master's thesis

Abstract: Magistrsko delo obravnava primerjavo različnih sistemov conskega hlajenja stanovanja. Najprej je izračunana hladilna obremenitev stanovanja z več temperaturnimi conami, tako ročno kot s programom KI Energija. Za tem so opisane različne vrste conskega hlajenja in izvedena je primerjava različnih vrst hladilnih naprav. Izbrana je adsorpcijska toplotna črpalka v povezavi s kanalnim sistemom hlajenja. Preračunana je velikost kanalnega sistema hlajenja, potrebna moč adsorpcijske toplotne črpalke in velikost drugih potrebnih komponent za delovanje sistema. V zaključku je izračunana investicija v kanalni sistem z adsorpcijsko toplotno črpalko in primerjana z investicijo v kanalni sistem s kompresorsko toplotno črpalko.
Keywords: consko hlajenje stanovanja, adsorpcijska toplotna črpalka, kanalno hlajenje, sončni kolektorji, ekonomski izračun investicije
Published in DKUM: 15.01.2024; Views: 277; Downloads: 15
.pdf Full text (3,05 MB)

8.
Analysis of pipeline vibration
Jurij Avsec, Urška Novosel, 2019, original scientific article

Abstract: Vibrations occur in almost all energy systems. This article presents an analysis of vibrations in pipelines under the influence of fluxes of displaced persons with a pressure difference or with the help of electromagnetic forces. For this purpose, we analysed pipelines of different diameters and the flow of crude oil within the pipelines.
Keywords: pipeline vibration, pipeline fluid flow, continuous vibration
Published in DKUM: 05.12.2023; Views: 204; Downloads: 6
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9.
Thermal analysis and application of roll bond solar absorbers for heating and cooling in residential buildings
Jurij Avsec, Daniel Brandl, Helmut Schober, Urška Novosel, Janko Ferčec, 2019, original scientific article

Abstract: The use of renewable energy sources will have to be increased significantly over the coming decades. The potential of solar energy in Slovenia represents the largest share of renewable energy sources. This article shows the use of roll bond solar absorbers for the heating and cooling of houses. For this purpose, we performed a numerical simulation of solar absorbers and theoretical calculations.
Keywords: roll bond technology, STAF panel, solar technology, heat pump
Published in DKUM: 05.12.2023; Views: 217; Downloads: 4
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10.
Production, thermal analysis and application of roll bond solar absorbers for heating and cooling in residential buildings
Jurij Avsec, Daniel Brandl, Helmut Schober, Urška Novosel, Janko Ferčec, 2019, published scientific conference contribution

Abstract: The effects of global warming are a crucial issue in the near future. The combination of renewable energy sources (RES) and the use of alternative energy technology such as heat pumps and hydrogen technology could solve major ecological problems. In Central Europe, the energy demand for heating and cooling in residential buildings is clearly higher than for generation of electricity or energy for trucking e.g. In this paper, a new solar thermal absorber has been analysed which is produced by using the so called "roll bond" technology (ABS Network, 2018). The focus of this study lies on the determination of the energy efficiency by combining this solar thermal absorber with heat pumps and biomass or geothermal systems in the region of Central Europe.
Keywords: roll bond solar absorbers, thermal analysis, solar systems, heat pump systems, heating and cooling in residential buildings
Published in DKUM: 04.12.2023; Views: 227; Downloads: 14
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