20.500.12556/RUL-186570 Pregled in primerjava nadomestnih hladiv z manjšim vplivom na okolje za R-410A v toplotnih črpalkah Review and comparison of low environmental impact refrigerants as alternatives to R-410A in heat pumps Zaradi zaostrovanja omejitev pri uporabi hladiv z visokim potencialom globalnega segrevanja (GWP) se raziskujejo možnosti uporabe alternativnih hladiv, ki ohranjajo primerljiv energijski izkoristek. V nalogi so bili izvedeni enostavni izračuni za toplotno črpalko, ki deluje med temperaturo uparjanja 0 °C in temperaturo kondenzacije 40 °C, s 5 °C pregrevanja in podhlajevanja. Primerjava je bila narejena za referenčno hladivo R410A, s katerim smo primerjali hladiva R32, R454B, R452B, R451B, R1234ze(E), R290 in R600a. Za vsako hladivo smo izračunali vrednosti tlaka v uparjalniku in kondenzatorju, tlačno razmerje, grelno število, volumetrično grelno kapaciteto ter vrednost GWP po Uredbi (EU) 2024/573 in varnostni klasifikaciji ISO 817. Rezultati kažejo, da hladiva R32, R454B in R452B predstavljajo najboljši kompromis med obratovalnimi pogoji, energijskim izkoristkom, varnostnim razredom in okoljskim vplivom. Pridobljeni rezultati omogočajo sistematično primerjavo vpliva izbire hladiva na termodinamično delovanje toplotne črpalke ter ovrednotenje hladiv z vidika okoljskega vpliva in varnostne klasifikacije. Due to increasingly stringent restrictions on the use of refrigerants with high global warming potential (GWP), research is being conducted into the use of alternative refrigerants that maintain comparable energy efficiency. In this study, simple calculations were performed for a heat pump operating between a vaporization temperature of 0 °C and a condensation temperature of 40 °C, with 5 °C of superheat and subcooling. A comparison was made with the reference refrigerant R410A, against which we compared the refrigerants R32, R454B, R452B, R451B, R1234ze(E), R290, and R600a. For each refrigerant, we calculated the evaporator and condenser pressures, the pressure ratio, the heating number, the volumetric heat capacity, the GWP value according to Regulation (EU) 2024/573, and the safety classification according to ISO 817. The results show that refrigerants R32, R454B, and R452B represent the best compromise between working parameters, energy efficiency, safety class, and environmental impact. The results obtained enable a systematic comparison of the impact of refrigerant selection on the thermodynamic performance of a heat pump and an evaluation of refrigerants in terms of environmental impact and safety classification. hladiva toplotne črpalke alternativna hladiva termodinamična analiza potencial globalnega segrevanja parno-kompresijski sistemi refrigerants heat pumps alternative refrigerants thermodynamic analysis global warming potential vapor-compression systems true false false [B. Mrak] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-03 08:30:26 2026-09-03 08:30:37 2026-09-04 09:26:24 0000-00-00 00:00:00 2026 0 Ljubljana 0 XX, 57-58 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.564:621.577:504.7(043.2) 288990 289998851 48940.pdf 48940.pdf 1 74308C7D3FDC07E18E997D3D90CE4824 89101bc84d54b1ebbf9e803b4e2deba4e620e709aefcf767386d71f7fa00707c 8bb2f8d5-a760-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=245846 Fakulteta za strojništvo 0 0 0