4E Analysis of Enhanced Ejector Compression Absorption Cascade Cycle Working with Low GWP and ODP Refrigerants

Abstract

In this paper, a new ejector compression absorption cascade cycle is presented. The energy, exergy, economic, and environmental analyses of the enhanced ejector compression cascade cycle are carried out. The model of the ejector and the compression absorption cascade cycle are validated using numerical and experimental results from literature in the same operating conditions. The thermodynamic performance of 9 refrigerant fluids with low GWP and ODP are compared. Then comparison of the performance of the proposed cycle and the conventional compression absorption cascade cycle is presented and the effect of the same conception parameter on the performance of the proposed cycle is defined. The results show that the RE170 has a higher coefficient of performance and exergy efficiency and a lower annual cost of the proposed cycle than the other 8 refrigerants, further the RE170 has GWP equal to 0.1 and ODP equal to 0. The enhancement in the coefficient of performance and in the exergy efficiency of proposed cycle is 3.27 and 2.7 % respectively compared with conventional compression absorption cascade cycle. Also, the diminution of the annual cost and the equivalent mass emission of CO2 of proposed cycle is 7.93, 2.3 % compared with conventional compression absorption cascade cycle. The analysis of obtained results allows the conclusion that there is a generation temperature in which the coefficient of performance and the exergy efficiency of the proposed cycle are at maximum value and its annual cost is at minimum value. The coefficient of performance and the exergy efficiency of the proposed cycle are positively affected by increasing the sub-cooling heat exchanger efficiency and both its annual cost and its equivalent mass of CO2 emission are negatively affected, contrary to the inlet temperature of the absorption cycle section in the cascade heat exchanger. The heat exchanger components of the proposed cycle are responsible for the most the destruction of exergy. The performances of the proposed cycle are promoted.

Keywords

• absorption cascade
• ejector compression
• enhanced ejector
• COP
• exergy efficiency

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