Comparative analysis of an improved two-stage multi-inter-cooling ejector-expansion trans-critical CO2 refrigeration cycle

A new two-stage multi-inter-cooling ejector-expansion system trans-critical CO2 refrigeration cycle has been recently introduced. In the present study, an internal heat exchanger has been included within this cycle for possible improvement in cooling performance. Comparative studies on the COPs of the two cycles at the same operational conditions showed that improved cycle could be more efficient alternative for the original cycle at low gas cooler pressures. Of course, internal heat exchanger increased the total exergy destruction rate, but overall improvement index increased when internal heat exchanger was used within the refrigeration cycle. (C) 2015 Elsevier Ltd. All rights reserved.