First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector

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 (E...

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Main Authors:	Damoon Aghazadeh Dokandari, S. M. S. Mahmoudi, M. Bidi, Ramin Haghighi Khoshkhoo, Marc A. Rosen
Format:	Article
Language:	English
Published:	MDPI AG 2018-04-01
Series:	Sustainability
Subjects:	refrigeration cycle ejector nitrous oxide COP exergy
Online Access:	http://www.mdpi.com/2071-1050/10/4/1177

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spelling	doaj-fc5ef27a82684d7d905c4ed8fc1a9a182020-11-25T00:14:47ZengMDPI AGSustainability2071-10502018-04-01104117710.3390/su10041177su10041177First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an EjectorDamoon Aghazadeh Dokandari0S. M. S. Mahmoudi1M. Bidi2Ramin Haghighi Khoshkhoo3Marc A. Rosen4Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, IranFaculty of Mechanical Engineering, Tabriz University, Tabriz 51666-14766, IranFaculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, IranFaculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran 16765-1719, IranFaculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, CanadaAn 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 N2O 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 CO2 refrigeration cycles correspond to a high side pressure of 8.5 MPa. Consequently, these lead to a lower electrical power consumption by the compressor.http://www.mdpi.com/2071-1050/10/4/1177refrigeration cycleejectornitrous oxideCOPexergy
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Damoon Aghazadeh Dokandari S. M. S. Mahmoudi M. Bidi Ramin Haghighi Khoshkhoo Marc A. Rosen
spellingShingle	Damoon Aghazadeh Dokandari S. M. S. Mahmoudi M. Bidi Ramin Haghighi Khoshkhoo Marc A. Rosen First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector Sustainability refrigeration cycle ejector nitrous oxide COP exergy
author_facet	Damoon Aghazadeh Dokandari S. M. S. Mahmoudi M. Bidi Ramin Haghighi Khoshkhoo Marc A. Rosen
author_sort	Damoon Aghazadeh Dokandari
title	First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector
title_short	First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector
title_full	First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector
title_fullStr	First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector
title_full_unstemmed	First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector
title_sort	first and second law analyses of trans-critical n2o refrigeration cycle using an ejector
publisher	MDPI AG
series	Sustainability
issn	2071-1050
publishDate	2018-04-01
description	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 N2O 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 CO2 refrigeration cycles correspond to a high side pressure of 8.5 MPa. Consequently, these lead to a lower electrical power consumption by the compressor.
topic	refrigeration cycle ejector nitrous oxide COP exergy
url	http://www.mdpi.com/2071-1050/10/4/1177
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First and Second Law Analyses of Trans-critical N2O Refrigeration Cycle Using an Ejector

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