Analysis of a thermodynamic process with real working media

U radu se obrađuje proces ukapljivanja helija, točnije, prati se kružni proces ukapljivanja helija u Kochovom ukapljivaču koji se zapravo temelji na Collinsovom kružnom procesu. Koristeći eksperimentalne podatke iz Kochova ukapljivača, provode se daljnji proračuni vezani uz bilance tvari i energije, kao i određivanja ostalih značajki procesa (iskorištenje ekspandera, iscrpak itd.) pomoću računalnog programa REFPROP, baze termodinamičkih parametara za realne radne tvari. Navedeni termodinamički proces prikazuje se u odgovarajućim termodinamičkim dijagramima kako bi se zorno predočio tijek samog procesa ukapljivanja te stanja fluida u procesu.In this project work, the process of helium liquefaction is presented in Koch´s liquefier which is actually based on Collins cycle. By using experimental data from Koch´s liquefier, further calculations are made in terms of balance of matter and energy as in determining other process features (expander utilization, yield etc.) by the help of REFPROP, thermodynamic parameters database of real working media. Thermodynamic process, mentioned above, is presented in corresponding thermodynamic diagrams so the liquefaction process would be easily shown and also that the state of fluid could be monitored