Volume 18, Issue 1 (3-2018)                   Modares Mechanical Engineering 2018, 18(1): 433-440 | Back to browse issues page

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Aghazadeh dokandari D, Naseri A, Bidi M, haghighi khoshkhoo R. First and second laws of thermodynamics analysis of transcritical N2O refrigeration cycle with an ejector. Modares Mechanical Engineering 2018; 18 (1) :433-440
URL: http://mme.modares.ac.ir/article-15-8487-en.html
First and second laws of thermodynamics analysis of transcritical N2O refrigeration cycle with an ejector
Damoon Aghazadeh dokandari1 , Ali Naseri2 , Mokhtar Bidi * 1, Ramin Haghighi khoshkhoo2
1- Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
2- Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran.
Abstract:   (5928 Views)
An ejector-expansion refrigeration cycle employing N2O is studied in this paper and thermodynamic and exergy analysis is carried out to find out the effect of some key factor within the system. The results show that Ejector-Expansion Refrigeration Cycle (EERC) obviously has the highest maximum coefficient of performance and exergy efficiency by about 12% and 14% more than Internal Heat Exchanger Cycle (IHEC); meanwhile these are about 15% and 16.5% higher than Vapor-Compression Refrigeration Cycle (VCRC) ones, respectively. Moreover, the total exergy destruction in N2O ejector-expansion cycle is 63.3% and 54% less than IHEC and VCRC and the exergy destructed in expansion process within EERC is 19.39% and 40.497% of total destruction less than IHEC and VCRC. Furthermore, the highest COP for vapor-compression refrigeration, internal heat exchanger and ejector-expansion refrigeration cycles is corresponding to the high side pressure of 7.328 Mpa, while this value for CO2 refrigeration cycle is about 8.5 Mpa.
Keywords: refrigeration cycle, ejector, N2O, COP, exergy efficiency
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Article Type: Research Article | Subject: Thermodynamics
Received: 2017/11/9 | Accepted: 2017/12/29 | Published: 2018/01/19
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