N2 - An analysis of energy efficiency for transcritical compression unit with CO2 (R744) as the refrigerant has been carried out using empirical operating characteristics for the two-phase ejector. The first stage of the refrigerant compression is carried out in the ejector. The criterion adopted for the estimation of energy efficiency for the cycle is the coefficient of performance COP. The analysis is performed for the heat pump and refrigeration systems. The results of COP for the systems with the ejector has been compared with the COPL values for the single stage Linde cycle. L1 - http://www.journals.pan.pl/Content/94170/PDF/06_paper.pdf L2 - http://www.journals.pan.pl/Content/94170 PY - 2010 IS - No 4 October EP - 69 DO - 10.2478/v10173-010-0028-3 KW - Transcritical CO2 cycle KW - Ejector KW - Energy efficiency A1 - Kozioł, Joachim A1 - Gazda, Wiesław A1 - Wilżyński, Łukasz PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2010 T1 - Energy efficiency for the transcritical compression CO2 cycle with the use of the ejector as the first stage of the compression SP - 61 UR - http://www.journals.pan.pl/dlibra/publication/edition/94170 T2 - Archives of Thermodynamics