Premium
Second law analysis of two‐stage compression transcritical CO 2 heat pump cycle
Author(s) -
Özgür Arif Emre,
Bayrakçi Hilmi Cenk
Publication year - 2008
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.1415
Subject(s) - transcritical cycle , exergy , refrigerant , hvac , refrigeration , exergy efficiency , coefficient of performance , work (physics) , vapor compression refrigeration , component (thermodynamics) , environmental science , thermodynamics , second law of thermodynamics , process engineering , engineering , mechanical engineering , gas compressor , air conditioning , physics
Because of the global warming impact of hydro fluorocarbons, the uses of natural refrigerants in automotive and HVAC industries have received worldwide attention. CO 2 is the most promising refrigerant in these industries, especially the transcritical CO 2 refrigeration cycle. The objective of this work is to identify the main factors that affect two‐stage compression transcritical CO 2 system efficiency. A second law of thermodynamic analysis on the entire two‐stage CO 2 cycle is conducted so that the exergy destruction of each system component can be deduced and ranked, allowing future efforts to focus on improving the components that have the highest potential for advancement. The inter‐stage pressure is used as a variable parameter in the analysis study. The second law efficiency, coefficient of cooling performance and total exergy destruction of the system variations with the inter‐stage pressure are presented graphically. It was concluded that there is an optimum inter‐stage pressure that maximizes both first law and second law efficiencies. Copyright © 2008 John Wiley & Sons, Ltd.