Thermodynamic investigation and optimization of novel ejector-expansion CO2/NH3 cascade refrigeration cycles (novel CO2/NH3 cycle) |
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| Affiliation: | 1. National Iranian South Oil Company (NISOC), National Iranian Oil Company (NIOC), Ahwaz, Iran;2. Department of Mechanical Engineering, Bostan-abad Branch, Islamic Azad University, Bostan-abad, Iran;3. Faculty of Mechanical Engineering, University of Tabriz, Iran;1. Jaume I University, Dep. of Mechanical Engineering and Construction, Campus de Riu Sec s/n, E-12071 Castellón, Spain;2. Polytechnic University of Valencia, Department of Applied Thermodynamics, Camino de Vera, 14, E-46022 Valencia, Spain;1. Scuola di Ingegneria Industriale, Campus di Piacenza, Politecnico di Milano, Via Scalabrini, 76, 29100 Piacenza, Italy;2. Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4, 20156 Milano, Italy;3. School of Mechanical and Manufacturing Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia;1. Department of Mechanical Engineering, Malviya National Institute of Technology, Jaipur, India;2. Department of Mechanical Engineering, PDM College of Engineering, Bahadurgarh, Haryana, India |
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| Abstract: | The present study thermodynamically evaluated the ejector utilization's impact on the performance of the cascade cycle that uses CO2 and NH3 as refrigerants. The theoretical analysis on the functional features based on the first and second laws of the thermodynamics illustrates the facts that the maximum cop and the maximum second law efficiency are on average7 and 5 percent higher than the conventional cycle. However, the exergy destruction rates roughly 8 percent lower as compared to the conventional cycle. Therefore, the novel ejector-expansion cascade cycle is a promising refrigeration cycle from the thermodynamically and practical points of view. A linear regression through the terms of Teva, Tcond, ΔT yields to three useful correlations for maximum COP, maximum second law efficiency, and in accordance with their optimal temperature. |
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| Keywords: | Ejector Cascade cycle Exergy destruction rate Second law COP Ejecteur Cycle en cascade Vitesse de destruction exergétique Second principe de la thermodynamique COP |
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