20.500.12556/DKUM-90241 Primerjava toplotnih črpalk z različnim hladilnim medijem Comparison of heat pumps with different refrigerant Namen diplomskega dela je z računalniškimi simulacijami pridobiti rezultate, ki omogočajo primerjavo ključnih parametrov, kot so hladilni medij, pretoki snovi, koeficient učinkovitosti (COP) in stroški. Cilj je pomagati podjetjem in uporabnikom toplotnih črpalk pri izbiri najustreznejše naprave za njihove potrebe. Toplotne črpalke so ključne tako za stanovanjske objekte, kjer zagotavljajo udobje in toploto, kot tudi za industrijo, kjer se uporabljajo za različne procese, kot so ogrevanje materialov, destilacija in koncentriranje raztopin. Pri izbiri hladilnega medija smo upoštevali več dejavnikov, zlasti okoljske vplive, saj smo želeli delati s snovmi, ki bodo v prihodnosti še vedno dovoljene. Preverili smo njihovo vnetljivost, toksičnost ter vrednosti ODP in GWP, ki so ključne za določanje podnebnih vplivov. Eksperimentalni del naloge je bil večinoma izveden s pomočjo programske opreme Aspen Plus, kjer smo izvajali simulacije različnih toplotnih črpalk in analizirali njihove rezultate. Pri osnovnih simulacijah smo fiksirali masni pretok vode pri 1000 kg/h in simulacije optimizirali glede na hladilno sredstvo pri treh različnih temperaturnih režimih izstopne vode (40 °C, 50 °C in 60 °C). Prva analiza je pokazala, da so hladilni mediji z nižjimi masnimi pretoki učinkovitejši pri prenosu toplote, kar vpliva na celotno učinkovitost toplotnih črpalk. Pri analizi občutljivosti pa smo ugotovili, da je COP na splošno višji pri nižjih izstopnih temperaturah vode, optimalen pretok grelne vode pa zagotavlja najboljše ravnovesje med prenosom toplote in energijsko porabo, kar vodi do najvišjega COP. The aim of our thesis is to use computer simulations to obtain results that allow a comparison of key parameters such as refrigerant, material flows, coefficient of performance (COP) and cost. The aim is to help companies and heat pump users to choose the most suitable device for their needs. Heat pumps are essential for both residential applications, where they provide comfort and heat, and for industry, where they are used for various processes such as heating materials, distillation and concentrating solutions. We took several factors into account when selecting the refrigerant, in particular the environmental impact, as we wanted to work with substances that will still be allowed in the future. We checked their flammability, toxicity and ODP and GWP values, which are key for determining climate impacts. The experimental part of the task was mainly carried out using Aspen Plus software, where we ran simulations of different heat pumps and analysed their results. For the basic simulations, the water mass flow rate was fixed at 1000 kg/h and the simulations were optimised depending on the refrigerant at three different outlet water temperature regimes (40 °C, 50 °C and 60 °C). The first analysis showed that cooling media with lower mass flow rates are more efficient in heat transfer, which has an impact on the overall efficiency of heat pumps. However, in the sensitivity analysis, we found that the COP is generally higher at lower outlet water temperatures and the optimum heating water flow provides the best balance between heat transfer and energy consumption, leading to the highest COP. subkritična toplotna črpalka transkritična toplotna črpalka hladilni medij koeficient učinkovitosti okoljski vplivi subcritical heat pump transcritical heat pump refrigerant coefficient of performance environmental impacts true true false [N. Preložnik] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-08-27 11:32:22 2024-09-10 07:54:39 2024-11-13 14:29:48 0000-00-00 00:00:00 2024 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.577(043.2) 213895939 UN_Vesenjak_Blaz_2024.pdf UN_Vesenjak_Blaz_2024.pdf 1 67851CF51DBBFA789CB8C92D0B33A058 46387ac2e12a0948a60703be68495ed59836ae7726e1999c5c915e0d2fc346ee a48d38be-6e9e-11ef-a573-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=184707 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0