Comparative study of transcritical vapor compression configurations using CO2 as refrigeration mode base on simulation

Despite of the excellent efficiency of the CO2 transcritical cycle in heat pump mode, there is a loss of efficiency in refrigeration mode compared with the subcritical vapor compression cycle with HFC refrigerants. This reason has lead several researches to propose ways to improve the transcritical...

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Bibliographic Details
Published in:Applied thermal engineering 2013-03, Vol.51 (1-2), p.1038-1046
Main Authors: Pérez-García, V., Belman-Flores, J.M., Navarro-Esbrí, J., Rubio-Maya, C.
Format: Article
Language:English
Subjects:
Applied sciences
Carbon dioxide
CO2
Compressing
Computer simulation
COP
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Optimization
Refrigerants
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Refrigeration
Simulation
Single stage
Techniques. Materials
Transcritical system
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Summary:Despite of the excellent efficiency of the CO2 transcritical cycle in heat pump mode, there is a loss of efficiency in refrigeration mode compared with the subcritical vapor compression cycle with HFC refrigerants. This reason has lead several researches to propose ways to improve the transcritical cycle performance using CO2 as refrigerant in refrigeration mode, mainly associated to cycle configurations changes. In this paper, a comparative study and energetic simulation of most common configurations for transcritical single stage cycle using CO2 as refrigerant has been carried out. In order to make the comparison, a cycle components modelization has been proposed and the simulation results are used to find the optimum configuration for a single stage vapor compression transcritical system. ► A comparative study and energetic simulation of most common configurations for transcritical single stage cycle using CO2. ► The characterization of each of the configurations has been done under steady state conditions. ► In DEC configuration, the superheating helps the COP to increase around of 4.5% in the firsts 1.8 °C approximately. ► The configuration resulting to be the most efficient is the one which uses a turbine as an expansion device. ► Superheating degree in DEC and DEC + IHE configurations is beneficial in both cases.
ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2012.10.018