41 KB382 KB41 KB199920252001Može, MitjaNovak, PeterStritih, Uroš13 straniletnik:47številka:7str. 300-312ISSN:0039-2480COBISSID:4886299URN:URN:NBN:SI:doc-SC3SHBLKenslAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikCFChladilni sistemimodelimodeli termodinamičninaprave klimatskeodprti sistemisimuliranjesistemi hladilnitermodinamikaModel in simuliranje delovanja odprtega hladilnega postopka brez uporabe CFC| Design and simulation of a CFC-free open air-conditioning system|In this paper a model is presented and its operation of a cooling process that uses air-as the cooling medium. In the introduction, conventional refrigerants are compared with an alternative refrigerant - air. The system construction and the thermodynamic model are presented. The model is used to study the performance of a CFC-free air-conditioning system, in which some parameters of the individual components are variable while the others are constant for the referenced data. The characteristic performance curves of a simple air-conditioning system are defined as the coefficient of performance (COP), the temperature of the cooled outlet air, the compression presure and other parameters. Using actual data from an air-conditioning system we obtained performance curves of the system. Relations between specific parameters and quantities are presented in diagrams. Losses in the system, resulting from non-isentropic compression in the centrifugal compressor and expansion in the turbine expander and the irreversible losses of the heat transfer in the heat exchanger are explainedV prispevku sta opisana model in delovanje hladilnega postopka, ki za hladilno sredstvo uporablja zrak. V uvodu so opisana običajna hladiva, ki jih primerjamo z alternativnim hladivom - zrakom. Opisana je sestava sistema in termodinamični model. Model je namenjen za študij delovanja CFC-prostega zračnega klimatizacijskega sistema, pri katerem so ob referenčnih podatkih izbrani parametri spremenljivke, preostali pa konstante. Karakteristične krivulje so definirane s hladilnim številom COP, temperaturo ohlajenega zraka, kompresijskim tlakom in drugimi parametri. Karakteristike sistema so dobljene z dejanskimi obratovalnimi razmerami. Razmerja med specifičnimi parametri in veličinami so predstavljena z diagrami. Obrazložene so izgube sistema zaradi neizentropne kompresije v centrifugalnem kompresorju, ekspanzije v turbinskem ekspanderju in nepovračljivosti postopka prenosa toplote v prenosniku toploteTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo