Investigation of the liquid-vapor separator efficiency on the performance of the ejector used as an expansion device in the vapor-compression refrigeration cycle

[+] Author and Article Information
Ayse U. Atmaca

Dokuz Eylül University Faculty of Engineering Mechanical Engineering Department - Tinaztepe Yerleskesi 35390 Buca - IZMIR Izmir, Buca 35390 Turkey ugurcan.atmaca@deu.edu.tr

Aytunc Erek

Mechanical Eng. Dept. 35100 Bornova IZMIR, 35100 Turkey aytunc.erek@deu.edu.tr

Orhan Ekren

283/1 Sok. Number:48 Apt#4 Bornova Izmir, 35040 Turkey orhanekren@gmail.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received October 24, 2018; final manuscript received June 30, 2019; published online xx xx, xxxx. Assoc. Editor: Abel Hernandez-Guerrero.

ASME doi:10.1115/1.4044354 History: Received October 24, 2018; Accepted July 01, 2019


Ejector expansion refrigeration cycle with reference to constant pressure mixing theory is investigated to display the effects of the liquid-vapor separator efficiency on the performance, entrainment ratio, and area ratio at various operation conditions. Reversible ejector assumption is used for the highest theoretical performance limit; whereas efficiency of the liquid-vapor separator and all ejector components is added to the model to calculate more realistic performance improvement potentials. R1234yf and R1234ze(E) having negligible global warming potential values are used in the analyses. Zero-dimensional thermodynamic models are constructed applying the conservation equations between the inlets and outlets of the refrigeration cycle and ejector components. Percentage performance decrease is higher when the mixing section and the separator efficiency is added to the model at higher condenser temperatures compared to the lower evaporator temperatures. Vapor and liquid separation efficiency affects not only performance, but also the design of the ejector although it is an external component since it has influence on the area ratio and entrainment ratio. Finally, the difference between the percentage performance improvement of the reversible ejector cycle and the realistic ejector cycle including the separator and ejector components efficiencies is as high as 35% at the highest investigated condenser temperature for R1234yf.

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