First and Second Law Analyses of Trans-critical N 2 O Refrigeration Cycle Using an Ejector

Damoon Aghazadeh Dokandari, S. M. S. Mahmoudi, M. Bidi, Ramin Haghighi Khoshkhoo and Marc A. Rosen
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Damoon Aghazadeh Dokandari: Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, Iran
S. M. S. Mahmoudi: Faculty of Mechanical Engineering, Tabriz University, Tabriz 51666-14766, Iran
M. Bidi: Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, Iran
Ramin Haghighi Khoshkhoo: Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, Iran
Marc A. Rosen: Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada

Sustainability, 2018, vol. 10, issue 4, 1-14

Abstract: An ejector-expansion refrigeration cycle using nitrous oxide was assessed. Thermodynamic analyses, including energy and exergy analyses, were carried out to investigate the effects on performance of several key factors in the system. The results show that the ejector-expansion refrigeration cycle (EERC) has a higher maximum coefficient of performance and exergy efficiency than the internal heat exchanger cycle (IHEC), by 12% and 15%, respectively. The maximum coefficient of performance and exergy efficiency are 14% and 16.5% higher than the corresponding values for the vapor-compression refrigeration cycle (VCRC), respectively. The total exergy destruction for the N 2 O ejector-expansion cycle is 63% and 53% less than for IHEC and VCRC, respectively. Furthermore, the highest COPs for the vapor-compression refrigeration, the internal heat exchanger and the ejector-expansion refrigeration cycles correspond to a high side pressure of 7.3 MPa, and the highest COPs for the three types of CO 2 refrigeration cycles correspond to a high side pressure of 8.5 MPa. Consequently, these lead to a lower electrical power consumption by the compressor.

Keywords: refrigeration cycle; ejector; nitrous oxide; COP; exergy (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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