@conference{
author = "Mićić, Vladan and Pejović, Branko and Perušić, Mitar and Pavličević, Jelena and Budinski-Simendić, Jaroslava and Pavlović, Stefan and Andrić, Milorad",
year = "2018",
abstract = "Starting from the main relation for closed thermodynamic systems for maximum work of reverse processes, a general model for determining the minimum volume of the tank containing compressed ideal gases, nitrogen and oxygen, as the main constituent components of the air has been developed. In addition to thermal and mechanical, in the observed complex system there is a concentration imbalance. In this way, the analyzed isolated system fulfills the conditions for obtaining work. In determining the model, it is assumed that the initial parameters of the gas in the tank, the state of the environment and the necessary energy (maximum work) to be obtained from the given gas are known. Thermal and mechanical imbalance is realized through an isentropic and isothermal state change, while the problem of concentration imbalance, considering the observed gases, is solved on the basis of the relation for the volume fraction of the component in the gas mixture, i.e. the partial pressure of the observed gas in the environment. In addition to the analytical, in order to control the obtained results, a graphical solution of the observed problem was given using the p-v i.e. T-s diagram. At the end of the work, the application of the model is illustrated on a practical example from practice, where the minimum volumes of the tank for nitrogen and oxygen as characteristic gases, were defined. In order to compare the results, the volume of the tank in which the air is located is determined under the same initial conditions, i.e. the same parameters of the environment. The obtained results can be used in practice for dimensioning or estimating the actual volume of the reservoirs for technical gases, since the actual processes are generally irreversible from the thermodynamic aspect., Polazeći od glavne relacije za zatvorene termodinamičke sisteme za maksimalan rad povratnih procesa, u radu je izveden opšti model za određivanje minimalne zapremine rezervoara u kome se nalaze komprimovani idealni gasovi azot i kiseonik koji su glavne sastavne komponente vazduha. Pored termičke i mehaničke neravnoteže, u posmatranom kompleksnom sistemu postoji i koncentraciona neravnoteža. Na taj način u analiziranom izolovanom sistemu su ispunjeni uslovi za dobijanje rada. Pri određivanju modela, pošlo se od pretpostavke da su poznati početni parametri gasa u rezervoaru, stanje okoline kao i neophodna energija (maksimalni rad) koji treba dobiti od datog gasa. Termička i mehanička neravnoteža ostvarena je preko izentropske i izotermske promene stanja dok je problem koncentracione neravnoteže, s obzirom na posmatrane gasove, rešen na bazi relacije za zapreminski udeo komponente u mešavini gasova odnosno parcijalni pritisak posmatranog gasa u okolini. Pored analitičkog rešenja, radi kontrole dobijenih rezultata dato je i grafičko rešenje posmatranog problema korišćenjem p-v odnosno T-s
dijagrama. Na kraju rada primena modela ilustrovana je na jednom primeru iz prakse gde su određene minimalne zapremine rezervoara za azot i kiseonik, kao posmatrane karakteristične gasove. Radi poređenja rezultata određena je i zapremina rezervoara u kome se nalazi vazduh pod istim početnim uslovima odnosno istim parametrima okoline. Dobijeni rezultati u praksi mogu poslužiti za dimenzionisanje odnosno procenu stvarne zapremine rezervoara za tehničke gasove s obzirom da su stvarni procesi sa termodinamičkog aspekta uglavnom nepovratni.",
journal = "Proceedings of 49th International HVAC&R Congress and Exhibition",
title = "Proposal for determining the minimum volume of the reservoir for characteristic compressed gases based on the concept of maximum work, Predlog za određivanje minimalne zapremine rezervoara za karakteristične komprimovane gasove na bazi koncepta maksimalnog rada",
volume = "2, 152",
pages = "145",
url = "https://hdl.handle.net/21.15107/rcub_cer_3773"
}
