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...

Full description

Saved in:
Bibliographic Details
Published in:Sustainability 2018-04, Vol.10 (4), p.1177
Main Authors: Dokandari, Damoon Aghazadeh, Mahmoudi, S.M.S., Bidi, M., Khoshkhoo, Ramin Haghighi, Rosen, Marc A.
Format: Article
Language:English
Subjects:
Carbon dioxide
Compression
Ejection
Electric power
Exergy
Expansion
Heat exchangers
Nitrous oxide
Power consumption
Pressure
Refrigeration
Sustainability
Thermodynamics
Vapor compression refrigeration
Vapors
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2071-1050
2071-1050
DOI:10.3390/su10041177