Transcritical CO2 refrigeration cycle with ejector-expansion device

An ejector expansion transcritical CO(2) refrigeration cycle is proposed to improve the COP of the basic transcritical CO(2) cycle by reducing the expansion process losses. A constant pressure mixing model for the ejector was established to perform the thermodynamic analysis of the ejector expansion transcritical CO, cycle. The effect of the entrainment ratio and the pressure drop in the receiving section of the ejector on the relative performance of the ejector expansion transcritical CO(2) cycle was investigated for typical air conditioning operation conditions. The effect of different operating conditions on the relative performance of the ejector expansion transcritical CO(2) Cycle was also investigated using assumed values for the entrainment ratio and pressure drop in the receiving section of the ejector. It was found that the COP of the ejector expansion transcritical CO(2) cycle can be improved by more than 16% over the basic transcritical CO(2) cycle for typical air conditioning operation conditions. (c) 2005 Elsevier Ltd and IIR. All rights reserved.