Arabian Journal for Science and Engineering

, Volume 44, Issue 2, pp 1165–1184 | Cite as

Comparative Thermodynamic Study of Refrigerants to Select the Best Environment-Friendly Refrigerant for Use in a Solar Ejector Cooling System

  • Bourhan Tashtoush
  • Mai Bani Younes
Research Article - Mechanical Engineering


In this study, a solar ejector cooling system is theoretically analyzed to evaluate refrigerants and determine their performance characteristics and environment-friendly nature for a fixed ejector geometry under a set of standard operating conditions. The results show that the refrigerant R1234yf is the best choice for the cycle, and is an environment-friendly refrigerant with thermo-physical properties similar to that of R134a. Moreover, it has a high entrainment ratio and is cheap when compared to other refrigerants, nonflammable, and safe. The results indicate that the cooling cycle COP increases during the day hours as the generator temperature increases and reaches a maximum value of 0.59 at an optimum generator temperature of 86 \({^{\circ }}\)C in the middle of the day. The overall efficiency of the system varied in the range 38–45%. Furthermore, it was found that increasing the generator pressure by 40% reduced the COP by 58.5% and increased the critical backpressure by 27.3%.


Solar ejector cooling system TRNSYS software Refrigerants Entrainment ratio Generator temperature 

List of symbols

\({A}_{\mathrm{c} }\)

Area of solar collector (m\(^{2}\))

\({m}_{\mathrm{c} }\)

Solar collector mass flow rate (kg h\(^{-1}\) m\(^{-2}\))


Primary mass flow rate (kg s\(^{-1}\))


Secondary mass flow rate (kg s\(^{-1}\))


Compression ratio


Enthalpy (kJ kg\(^{-1}\))


Expansion ratio


Critical condenser back pressure (kPa)


Evaporator pressure (kPa)


Area of mixing chamber (m\(^{2}\))


Area of nozzle throat (m\(^{2}\))


Primary flow location at the inlet of the nozzle


Volume of storage tank (\(\hbox {m}^{3}\))


Total irradiance (\(\hbox {W m}^{-2}\))


Temperature of generator (\({^{\circ }}\)C)


Temperature of condenser (\({^{\circ }}\)C)


Ejector area ratio


Specific heat (\(\hbox {kJ kg}^{-1} \hbox {K}^{-1}\))


Temperature of evaporator (\({^{\circ }}\)C)


Mach number


Gas constant (kJ kg\(^{-1}\) K\(^{-1}\))


Heat transfer rate (kW)


Temperature at the exit of solar collector (\({^{\circ }}\)C)


Temperature at the exit of storage tank (\({^{\circ }}\)C)


Temperature of the ambient air (\({^{\circ }}\)C)


Critical temperature (\({^{\circ }}\)C)


Generator pressure (kPa)


Coefficient of performance




Engineering equation solver


TRaNsient SYstem Simulation Program


Ozone depletion potential


Solar ejector cooling system


Global warming potential


Jordan University of Science and Technology











Primary flow


Primary nozzle exit


Primary flow at section y–y


Secondary flow


Mixing section m–m

Greek symbols

\(\Omega \)

Entrainment ratio

\(\eta _{\mathrm{o}}\)

SECS overall efficiency

\(\eta _{\mathrm{sc}}\)

Efficiency for solar collector

\({\gamma }\)

Specific heat ratio

\({\phi }_{\mathrm{m}}\)

Coefficient of heat losses


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This work was supported by the Scientific Research Support Fund in Jordan (Grant No. ENE/02/02/2012).


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Faculty of EngineeringJordan University of Science and TechnologyIrbidJordan

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