20.500.12556/DKUM-84998 Inovativen energetski sistem uporabe obnovljivih virov energije za visokotemperaturno ogrevanje magistrsko delo Innovative energy system using renewable energy sources for high-temperature heating V zaključnem delu smo zasnovali novo procesno shemo sistema visokotemperaturnega daljinskega ogrevanja katerega cilj je učinkovito ter ogljično nevtralno delovanje. Sistem je sestavljen iz gorivne celice vezane z dvostopenjsko kompresijsko toplotno črpalko. Gorivne celice so naprave za pretvorbo energije, ki proizvajajo elektriko (in toploto) neposredno iz plinastega goriva z elektrokemično kombinacijo goriva in oksidanta. V našem sistemu je gorivo zemeljski plin. Proizvedena elektrika iz gorivne celice samo zadostno oskrbuje toplotne črpalke ter hkrati proizvaja toploto, ki le te razbremenjuje. Skonstruirali smo osnovno shemo in dve dodatni alternativi, z dodanim vmesnim prenosnikom in zaporedno vezanimi toplotnimi črpalkami in jih primerjali pri različnih pogojih. V primeru temperature povratka 60 °C in končni temperaturi ogrevanja 80 °C osnovna shema z vmesnim prenosnikom toplote obratujeta pri COP vrednostih 3,15 oz. 3,21. Najvišje vrednosti COP smo zasledili pri zadnji alternativi in sicer 3,86, vendar ta ni samo zadostna in tako nastanejo dodatni stroški nakupa elektrike. Konkurenčnost in inovativnost sistema ne moremo meriti le s COP vrednostjo. Najboljši rezultat dobimo z 'izkoristkom' zemeljskega plina. Omenimo, da ne gre za navaden izkoristek, ampak utilizacijo - razmerje med dobljenim toplotnim tokom, ki se neposredno prenese na ogrevano vodo in vloženim toplotnim tokom zemeljskega plina na podlagi HHV in LHV. V osnovni shemi in z vmesnim prenosnikom dosežemo 251,62 % oz. 261,37 % glede na HHV ter 225,21 % oz. 233,99 % glede na LHV. Alternativa z zaporedno vezanimi toplotnimi črpalkami dosega 277,41 % glede na HHV in 247,38 % glede na LHV, vendar ni samo zadostna. In the master thesis, we designed a new flowsheet for a high-temperature district heating system, the goal of which is efficient and carbon-neutral operation. The system consists of a fuel cell connected to a two-stage compression heat pump. Fuel cells are energy recovery devices that produce electricity (and heat) directly from a gaseous fuel through an electrochemical combination of fuel and oxidant. In our system, the fuel is natural gas. The electricity produced from the fuel cell self sufficiently supplies the heat pumps and at the same time produces heat that relieves them. We constructed a basic scheme and two additional alternatives, with an added intermediate heat exchanger and series-connected heat pumps then compared them under different conditions. In the case of a return temperature of 60 °C and a final heating temperature of 80 °C, the basic scheme and with an intermediate heat exchanger operate at COP values of 3.15 and 3.21 respectively. The highest COP values were found in the last alternative, namely 3.86, but it's not self sufficient and thus additional costs of electricity purchase arise. The competitiveness and innovation of the system cannot be measured only by the COP value. The best result is obtained with the utilization of natural gas. It's calculated as a ratio between the obtained heat flow, which is directly transferred to the heated water, and the input heat flow of natural gas based on HHV and LHV. In the basic scheme and with an intermediate exchanger, we reach 251.62% and 261.37% respecivetly with respect to HHV and 225.21% and 233.99% respectively according to LHV. The alternative with series-connected heat pumps achieves 222.31% with respect to HHV and 277.41% with respect to LHV, but it is not self sufficient. Visokotemperaturna toplotna črpalka gorivna celica SOFC visokotemperaturno daljinsko ogrevanje razogljičenje sistema daljinskega ogrevanja Hightemperature heat pump fuel cell SOFC hightemperature district heating decarbonization of district heating systems true true false [S. Gruber] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-08-15 09:05:09 2023-09-14 14:44:12 2023-10-07 03:28:00 0000-00-00 00:00:00 2023 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (X, 78 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2026-08-31 620.92/.93:697.34(043.2) 167308035 MAG_Gruber_Sven_2023.pdf MAG_Gruber_Sven_2023.pdf 1 A1C0EA0928C281AD5C8317923E57A3F0 19761d8ea16cc8e857c05f2ea439726a6b080c148b097aaf00f2960aa26e0ed2 cbd2552a-5241-11ee-bbb4-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=172155 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0