Working media in thermodynamic processes

U radu su navedene najčešće korištene radne tvari u termodinamičkim procesima i opisana su njihova svojstva. Uz vodenu paru i zrak kao radne tvari, najviše se pozornosti obraća na rashladne tvari kao što su amonijak, freoni i ugljikov dioksid, koji su se kroz 20 st. smjenjivali kao vodeće radne tvari u rashladnim procesima. Korišten je program REFPROP koji sadrži sve informacije o radnim tvarima. Pomoću njega ispisani su dijagrami (T,s, h,s, p,v) i tablice svojstava. Postoji velik broj radnih tvari, zato će pobliže biti opisane najčešće korištene radne tvari u industriji, te protokoli i zakoni koji su doneseni zbog štetnog utjecaja na okoliš (oštećuju ozonski omotač i utječu na globalno zatopljenje).This bachelor thesis focuses on the most used working media in thermodynamic processes and describes their properties. It does not only deal with working media such as air and water steam, but also refrigerants such as ammonia, freon and carbon dioxide, which replaced one another in the role of the main working fluid in cooling systems. Data for this thesis were obtained through the REFPROP programm. It is a programm that contains all the information about working media. All the diagrams, properties and examples of the working media demonstrated in the work are based on the REFPROP programm. Due to the large number of working media, this work analyses only a few of them and mentions protocols and laws that are made beacuse of their harmful environmental impact