Experimental analysis of cooling and heating performance of serial and parallel connected counter-flow Ranquee–Hilsch vortex tube systems using carbon dioxide as a working fluid

•The highest ΔT was highest as 76.9 K in parallel connected RHVT system.•The most efficient case in this study brass-six nozzle at 550 kPa.•CO2 provides higher thermal separation than air. This study examines the performance analysis of two counter flow Ranquee–Hilsch Vortex Tubes (RHVT) having the...

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