1709 KB0 KB201320252022Avsec, JurijStrušnik, Dušanletnik:15številka:iss. 4str. 11-28COBISSID_HOST:144592643ISSN:1855-5748URN:URN:NBN:SI:doc-82E8QCOHenFakulteta za energetikoJET on-lineJournal of energy technologycalculationefficiencyinvesticijeinvestmentizračunmarketmodeliranjemodellingpaybacktrgučinkovitostvračiloEnergo-economics payback investment calculation modelling of gas-steam combined cycle power plant| Energetsko-ekonomsko i. e. ekonomski model vračilne dobe plinsko-parne elektrarne s kombiniranim procesom|The paper deals with energo-economic payback calculation modelling of the combined gassteam cycle operation, demonstrating the basic characteristic properties of cycle behaviour in different operating regimes and calculating the payback period of the investment. The calculation of the payback period of the investment is based on the calculation of the net present value and with actual obtaining data sets from a recently built gas-steam combined cycle power plant. The results of the calculation modelling show that the gas-steam combined cycle power plant can achieve a useful efficiency of up to 88% in the back-pressure operation of the steam turbine. The useful efficiency of the gas turbine is up to 40%. The payback period of the investment depends on the investment costs, the quantity and market price of the consumed fuel, the quantity and market price of the generated electricity and thermal energy. The results show that with a price ratio fuel/electricity of 0.36, the payback period of the investment is 4 years, with a price ratio fuel/electricity of 0.54, the payback period of the investment is as much as 17 yearsPrispevek obravnava energetsko-ekonomski model izračuna vračila delovanja kombiniranega plinsko-parnega cikla s prikazom osnovnih značilnih lastnosti obnašanja cikla v različnih režimih obratovanja in izračunom vračilne dobe investicije. Izračun vračilne dobe investicije temelji na izračunu neto sedanje vrednosti in ob dejanskem pridobivanju nizov podatkov iz nedavno zgrajene plinsko-parne kombinirane elektrarne. Rezultati računskega modeliranja kažejo, da lahko plinsko-parna elektrarna pri protitlačnem obratovanju parne turbine doseže koristni izkoristek do 88 %. Koristni izkoristek plinske turbine je do 40 %. Vračilna doba investicije je odvisna od stroškov investicije, količine in tržne cene porabljenega goriva ter količine in tržne cene proizvedene električne in toplotne energije. Rezultati kažejo, da je pri cenovnem razmerju gorivo/elektrika 0,36 vračilna doba investicije 4 leta, pri cenovnem razmerju gorivo/elektrika 0,54 pa kar 17 letTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Mariboru, Fakulteta za energetiko