RT Journal Article SR Electronic A1 Čarnogurská, Mária A1 Gašparovič, Peter T1 Performance of Closed Type Impeller Designed for Easy Manufacturability JF Acta Mechanica Slovaca YR 2010 VO 14 IS 1 SP 20 OP 25 DO 10.2478/v10147-011-0003-2 UL https://www.actamechanica.sk/artkey/ams-201001-0003.php AB The impeller of the semi-open type from a refrigerator unit is redesigned to improve efficiency and to reduce the pressure pulsations of the front case. Therefore, the closed-type impeller with outer shroud is chosen. Dimensions are scaled according to Cordier diagram with rotational speed preserved. The resulting geometry is constrained by requirement of easy manufacturability by injection moulding process. These constrains don't permit to improve efficiency by redesigning impeller.