Abstract
To optimize the performance of the transcritical CO2 two-stage compression refrigeration system, the energy analysis and the exergy analysis are conducted. It is found that higher COP, lower compression power, and less exergy destruction can be achieved when the auxiliary gas cooler is applied. Moreover, the discharge temperature of the compound compressor (HPS) can be reduced by decreasing the temperature at the outlet of the auxiliary gas cooler (Tagc,out). When the Tagc,out is reduced from 30 to 12 °C, the discharge temperature of the compound compressor (HPS) can be decreased by 13.83 °C. Furthermore, the COP and the exergy efficiency can be raised by enhancing the intermediate pressure. Based on these results, the optimizations of system design and system operation are put forward. The application of the auxiliary gas cooler can improve the performance of the transcritical CO2 two-stage compression refrigeration system. Operators can decrease the discharge temperature of the compound compressor (HPS) by reducing the Tagc,out, and increase the COP and the exergy efficiency by enhancing the intermediate pressure.
Highlights
College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy
Several researchers have investigated the performance of transcritical CO2 two-stage compression refrigeration systems by energy analysis and exergy analysis
The objective is to obtain the optimizations of system design and system operation for the transcritical CO2 two-stage compression refrigeration system
Summary
The greenhouse effect has appeared, and the utilization of artificial refrigerants is one of the main reasons for this [1,2,3]. Several researchers have investigated the performance of transcritical CO2 two-stage compression refrigeration systems by energy analysis and exergy analysis. It was discovered that higher COP could be obtained from the transcritical CO2 two-stage compression refrigeration system with high-pressure mechanical subcooling system. The improvement of utilizing overfed evaporators and parallel compressor in the transcritical CO2 two-stage compression refrigeration system was proposed. Despite rich studies on the improvement of the transcritical CO2 two-stage compression refrigeration system, the performance impacts of the auxiliary gas cooler in the LPS and the intermediate pressure on this refrigeration system have not been investigated. The performance comparison analysis of the transcritical CO2 two-stage compression refrigeration system with an auxiliary gas cooler (RSF1) and the transcritical. Is conducted; the performance impacts of intermediate pressure on the transcritical CO2 two-stage compression refrigeration system are investigated. The objective is to obtain the optimizations of system design and system operation for the transcritical CO2 two-stage compression refrigeration system
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