20.500.12556/DKUM-21781 ENERGETSKA ANALIZA HLADILNIH NAPRAV NA OGLJIKOV DIOKSID ENERGY ANALYSIS OF REFRIGERATION SYSTEMS WITH CO2 Dandanes se klasični hladilni mediji, kot so freoni, umikajo iz uporabe oziroma so v hladilni tehniki že prepovedani, saj jih zamenjuje vse bolj priljubljen, ekonomsko in ekološko upravičen medij, ogljikov dioksid (CO2). Uporaba tega medija še ni tako razširjena zaradi specifičnosti izvedbe in prilagoditve hladilnih sistemov, zato se v večini primerov uporablja kot sekundarno hladilno sredstvo v kaskadnih sistemih. Da to dosežemo, moramo vse tlačno obremenjene elemente sistema prilagoditi posebnim zahtevam. V diplomskem delu sem se osredotočil na prednosti in slabosti CO2 sistemov, njihovo delovanje ter termične in fizikalne lastnosti CO2. Dejstvo je, da se danes o CO2 (v hladilstvu se uporablja oznaka R-744) veliko govori. Velika večina ljudi misli, da je R-744 škodljiv plin, a je v resnici zelo koristen in uporaben, če ga znamo pravilno izkoristiti. V nadaljevanju bo R-744 predstavljen kot zamenjava za obstoječe sisteme. Sam osebno menim, da se bo trend »zelene miselnosti« nadaljeval. Verjamem, da bo v prihodnjih nekaj letih uporaba freonov (F-plini) zakonsko omejena in kasneje tudi prepovedana. Nowadays, classical cooling media like freons get removed from use or they are already forbidden in cooling technique, because they are changed by more popular, economically and ecologically more justified medium – carbon dioxide (CO2). However, use of this medium is not very wide due to specificity of design and adjustment of cooling systems, and therefore is mainly used as a secondary cooling agent in cascade systems. For achieving this we have to adapt all system elements under pressure to special requirements. The diploma thesis is focused on advantages and disadvantages of CO2 systems, operation of CO2 systems and thermal and physical properties of CO2. It is a fact that CO2 (in cooling technique is used a mark R-744) raises many discussions. A big majority of people think, that R-744 is a harmful gas. However, it is very beneficial and useful, if it is properly used. The thesis continues with presentation of R-744 as a substitute for existing systems. My opinion is a trend of »thinking green« will go on. I believe that in a near future use of freons (F-gases) will be legally limited and later also forbidden. Komercialno hlajenje Kaskadni hladilni sistem Temperatura Tlak Okolje R-744 Commercial refrigeration Cascade cooling system Temperature Pressure Environment R-744 true true false [R. Šajnič] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2011-12-31 14:06:54 2012-02-05 18:03:07 2022-04-14 10:53:20 2023-12-29 03:15:19 2011 0 Krško 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.565.4(043.2) 1024077148 URN:SI:UM:DK:4ZLV8MSP VS_Sajnic_Rok_2012.pdf VS_Sajnic_Rok_2012.pdf 1 103CD3557D132CB9CC8CFDEFCBD6EA79 edde3699b852cb331b38c552836c2c9c664f45d249ab189a85fb2e22d4e55cdd f061eff2-7c05-11eb-bb7a-00155d0001ca 20.500.12556/dkum/a8162a82-eb56-46ae-baa5-a5d48dfa53c7 https://dk.um.si/Dokument.php?lang=slv&id=27828 Fakulteta za energetiko 0 0 0