Optimization of transcritical CO2 refrigeration cycle with parallel compression economization

published Sep 24, 2008 - 6 pages

Use of parallel compression economization is one of the promising cycle modifications to improve the COP for transcritical CO2 refrigeration system. The maim aim of the present study is to optimize of carbon dioxide refrigeration cycle with the addition of parallel compression
economization for air-conditioning applications. The cycle COP improvement over the basic expansion cycle and effect on optimum cycle high side pressure, which is related the
system design issues a

Use of parallel compression economization is one of the promising cycle modifications to improve the COP for transcritical CO2 refrigeration system. The maim aim of the present study is to optimize of carbon dioxide refrigeration cycle with the addition of parallel compression
economization for air-conditioning applications. The cycle COP improvement over the basic expansion cycle and effect on optimum cycle high side pressure, which is related the
system design issues are presented as well. The cooling COP improvement using parallel compression economization can be realized if the ratio of cooling effect improvement and economizing compressor work is more than the COP of basis expansion cycle. Study shows that there is some optimum economizer pressure where the COP improvement is maximum. Although for simultaneous optimization of gas cooler pressure and economizer pressure, two sets of optimal values can obtained for maximum cooling COP and COP improvement over the basic cycle. For studied gas cooler exit temperatures, the optimum economizer pressures
gives narrow values lies between 60 to 63 bar. At the optimum conditions, both the cooling COP and COP improvement compared to basic cycle decreases with increases in gas cooler exit temperature. For the given ranges of operating conditions in this study, the maximum
COP improvement over the basis expansion cycle is obtained as 32.8% through the theoretical analyses. The use of parallel compression economization in transcritical CO2 cycle is profitable for not only COP improvement also for lower optimum high side pressure.


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