FIRST AND SECOND LAWS OF THERMODYNAMICS ANALYSIS OF TRANSCRITICAL N2O REFRIGERATION CYCLE WITH AN EJECTOR

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AGHAZADEH DOKANDARI DAMOON; NASERI ALI; BIDI MOKHTAR; HAGHIGHI KHOSHKHOO RAMIN

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:1 Page(s): 433-440

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Title

FIRST AND SECOND LAWS OF THERMODYNAMICS ANALYSIS OF TRANSCRITICAL N2O REFRIGERATION CYCLE WITH AN EJECTOR

Author(s)

AGHAZADEH DOKANDARI DAMOON | NASERI ALI | BIDI MOKHTAR | HAGHIGHI KHOSHKHOO RAMIN | Issue Writer Certificate

Keywords

REFRIGERATION CYCLEQ1

RJECTORQ1

N2OQ1

COPQ2

EXERGY EFFICIENCYQ2

Abstract

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 and draw a comparison between this model and the others employing the same refrigerant and also CO2. Furthermore, the model developed in this study was validated by the same model proposed in other studies for CO2 as working fluid within the three types of these cycles, vapor-compression REFRIGERATION CYCLE (VCRC), internal heat exchanger cycle (IHEC) and ejector-expansion REFRIGERATION CYCLE (EERC). The results for N2O showed that the ejector entrainment ratio, one of the important parameters in ejector-expansion cycles representing the proportion of vapor and liquid in the outlet of ejector noticeably varies with high-side pressure of the cycle, just opposite the variation of vapor at the outlet of the ejector. The results show that Ejector-Expansion REFRIGERATION CYCLE obviously has the highest maximum coefficient of performance and EXERGY EFFICIENCY by about 12% and 14% more than Internal Heat Exchanger Cycle; meanwhile these are about 15% and 16.5% higher than Vapor-Compression REFRIGERATION CYCLE 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.

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APA: Copy

AGHAZADEH DOKANDARI, DAMOON, NASERI, ALI, BIDI, MOKHTAR, & HAGHIGHI KHOSHKHOO, RAMIN. (2018). FIRST AND SECOND LAWS OF THERMODYNAMICS ANALYSIS OF TRANSCRITICAL N₂O REFRIGERATION CYCLE WITH AN EJECTOR. MODARES MECHANICAL ENGINEERING, 18(1 ), 433-440. SID. https://sid.ir/paper/179399/en

Vancouver: Copy

AGHAZADEH DOKANDARI DAMOON, NASERI ALI, BIDI MOKHTAR, HAGHIGHI KHOSHKHOO RAMIN. FIRST AND SECOND LAWS OF THERMODYNAMICS ANALYSIS OF TRANSCRITICAL N₂O REFRIGERATION CYCLE WITH AN EJECTOR. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(1 ):433-440. Available from: https://sid.ir/paper/179399/en

IEEE: Copy

DAMOON AGHAZADEH DOKANDARI, ALI NASERI, MOKHTAR BIDI, and RAMIN HAGHIGHI KHOSHKHOO, “FIRST AND SECOND LAWS OF THERMODYNAMICS ANALYSIS OF TRANSCRITICAL N₂O REFRIGERATION CYCLE WITH AN EJECTOR,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 1 , pp. 433–440, 2018, [Online]. Available: https://sid.ir/paper/179399/en

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