Two-stage transcritical carbon dioxide cycle optimisation: A theoretical and experimental analysis

2005 ◽  
Vol 28 (8) ◽  
pp. 1274-1283 ◽  
Author(s):  
Alberto Cavallini ◽  
Luca Cecchinato ◽  
Marco Corradi ◽  
Ezio Fornasieri ◽  
Claudio Zilio
Keyword(s):  
Carbon Dioxide ◽  
Experimental Analysis ◽  
Two Stage ◽  
Transcritical Carbon Dioxide

Optimization of two-stage transcritical carbon dioxide heat pump cycles

2007 ◽  
Vol 46 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Neeraj Agrawal ◽  
Souvik Bhattacharyya ◽  
J. Sarkar
Keyword(s):  
Carbon Dioxide ◽  
Heat Pump ◽  
Two Stage ◽  
Transcritical Carbon Dioxide

Theoretical performance of transcritical carbon dioxide cycle with two-stage compression and intercooling

2005 ◽  
Vol 219 (2) ◽  
pp. 187-195 ◽  
Author(s):  
J. S. Baek ◽  
E. A. Groll ◽  
P. B. Lawless
Keyword(s):  
Carbon Dioxide ◽  
System Analysis ◽  
Coefficient Of Performance ◽  
System Efficiency ◽  
Compression Process ◽  
Two Stage ◽  
Bell Curve ◽  
Second Stage ◽  
Transcritical Carbon Dioxide ◽  
Theoretical Performance

A computer model was developed to perform a thermodynamic analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling. In typical two-stage compression with intercooling applications, the intercooler serves the purpose of cooling the fluid to the lowest possible temperature before it enters the second-stage compressor. This paper presents the results of the system analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling (intercooler cycle) and identifies the pressure ratios that provide maximum system efficiency. The results show that the coefficient of performance (COP), curves of the intercooler cycle are different from the ‘typical bell curve behaviours’ that are observed when plotting the COP versus the intermediate pressure with assumptions of isentropic and real compression process.

Transcritical Carbon Dioxide Refrigeration as an Alternative to Subcritical Plants

2016 ◽  
pp. 100-159
Author(s):  
Adriana Greco ◽  
Ciro Aprea ◽  
Angelo Maiorino
Keyword(s):  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Critical Temperature ◽  
Experimental Analysis ◽  
Internal Heat ◽  
Refrigeration Cycle ◽  
Desiccant Wheel ◽  
Internal Heat Exchanger ◽  
Transcritical Carbon Dioxide ◽  
Vapour Compression

Carbon dioxide (R744) is as a valid alternative to classical substances such as HFCs used in vapour compression plants. A transcritical refrigeration cycle is needed because the critical temperature of carbon dioxide is usually lower than the ambient temperature. In this chapter the performances of a transcritical cycle have been evaluated with a prototype R744 system working as a classical spit-systems to cool air. An experimental analysis has been carried out on the effect of: refrigerant charge, internal heat exchanger, heat rejection pressure on the energetic performances of the transcritical plant. An experimental analysis of a hybrid trans-critical refrigerator-desiccant wheel system has been carried out in order to improve the COP. The experimental transcritical cycle has been examined in comparison with a classical vapour compression plant working with the R134a.

scholarly journals Numerical analysis of transcritical carbon dioxide compression cycle: a case study

2018 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Mohammad Mehdi Keshtkar
Keyword(s):  
Carbon Dioxide ◽  
Coefficient Of Performance ◽  
Outlet Temperature ◽  
Two Stage ◽  
Change Of Variables ◽  
Compression Cycle ◽  
Transcritical Carbon Dioxide ◽  
Two Stages ◽  
Isentropic Efficiency

This study deals with thermodynamic investigation of a refrigeration compression cycle with carbon dioxide refrigerant and two stage compression. In this paper, the effect of intercooler in the two-stage compression system at different pressures of gas cooler is investigated. In addition, the performance of one stage compression cycle and two-stage compression cycle are compared and eventually, the performance of system is investigated under the influence of the change of variables such as gas cooler  pressure, isentropic efficiency of the compressors, the intercooling rate between the two stages of compression, the refrigerant gas cooler outlet temperature is examined. Due to evaporation temperature in the evaporator  and refrigeration capacity (kW) results show that the coefficient of performance in the two-stage compression with intercooler is increased compared to the single-stage compression cycle.

Thermodynamic analysis of different two-stage transcritical carbon dioxide cycles

2009 ◽  
Vol 32 (5) ◽  
pp. 1058-1067 ◽  
Author(s):  
Luca Cecchinato ◽  
Manuel Chiarello ◽  
Marco Corradi ◽  
Ezio Fornasieri ◽  
Silvia Minetto ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Thermodynamic Analysis ◽  
Two Stage ◽  
Transcritical Carbon Dioxide

Transcritical Carbon Dioxide Refrigeration as an Alternative to Subcritical Plants

2015 ◽  
pp. 295-359
Author(s):  
Adriana Greco ◽  
Ciro Aprea ◽  
Angelo Maiorino
Keyword(s):  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Critical Temperature ◽  
Experimental Analysis ◽  
Internal Heat ◽  
Refrigeration Cycle ◽  
Desiccant Wheel ◽  
Internal Heat Exchanger ◽  
Transcritical Carbon Dioxide ◽  
Vapour Compression

Carbon dioxide (R744) is as a valid alternative to classical substances such as HFCs used in vapour compression plants. A transcritical refrigeration cycle is needed because the critical temperature of carbon dioxide is usually lower than the ambient temperature. In this chapter the performances of a transcritical cycle have been evaluated with a prototype R744 system working as a classical spit-systems to cool air. An experimental analysis has been carried out on the effect of: refrigerant charge, internal heat exchanger, heat rejection pressure on the energetic performances of the transcritical plant. An experimental analysis of a hybrid trans-critical refrigerator-desiccant wheel system has been carried out in order to improve the COP. The experimental transcritical cycle has been examined in comparison with a classical vapour compression plant working with the R134a.

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