Performance analysis and working fluid selection for ejector refrigeration cycle

Saleh, B.

doi:10.1016/j.applthermaleng.2016.06.147

Cited by 81 publications

(25 citation statements)

References 24 publications

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“…The description of the ejector operating principles as follows: (1) the primary flow increases its velocity and expands in the nozzle of the ejector, (2) the nozzle exhausts the primary flow with supersonic speed and low mixing pressure (P m ),(3) due to the difference between primary and secondary flows pressures, the secondary stream enters the suction chamber and its velocity growths,(4) because of the velocity difference between the two flows, they exit from suction chamber without mixing. The two streams begin to mix in the mixing chamber where the secondary stream velocity continue in increasing while the primary stream velocity continue in decreasing due to mixing process till they completely mixed insection 3, (5) before delivery from the mixing chamber, a compression shock is encouraged which change the velocity from supersonic to subsonic and rise the pressure, (6)in the diffuser section the pressure continue in increasing while the velocity reduces and finally the refrigerant delivers to the condenser. The ejector design classified into two types based on the location of the nozzle outlet position.…”

Section: Processes and Mathematical Model Of The Ejectormentioning

confidence: 99%

“…In the present study, the mathematical model established by Saleh [5] is utilized to estimate the ejector behaviour and the performance of the ERC. The mathematical model evaluates both the ejector behaviour and the cycle performance and calculates the required ejector area ratio (EAR) as well.…”

Section: Processes and Mathematical Model Of The Ejectormentioning

confidence: 99%

“…Numerous experimental and theoretical studies were conducted to increase the comprehension of the ejector design and processes to increase the cycle performance. The efficiencies of the ejector components and operating parameters have a large influence on the ejector behaviour, and different refrigerants perform differently in the ERC [5]. The dependence of on the ejector behaviour and the cycle performance on the operating parameters and ejector geometry was analytically tested by computational fluid dynamics models, thermodynamic ejector models, besides the experimental studies [6][7][8].…”

mentioning

confidence: 99%

“…The effects of some selected operating parameters on the ejector behaviour and ERC performance are studied and discussed as well. The one-dimensional mathematical model for ejector developed by Saleh [5] is used to specify the ejector behaviour and the cycle performance.…”

mentioning

confidence: 99%

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A Parametric Analysis of an Ejector Refrigeration Cycle Activated by Renewable Energy

Saleh¹,

Tjprc²

2019

IJMPERD

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The refrigeration and cooling systems activated by waste heat and renewable energy sources can achieve high energy efficiency. In this paper, a performance investigation and working fluid choice for an ejector refrigeration cycle (ERC) activated by renewable energy source are conducted. In the ejector mathematical model, the mixing process through the ejector constant-area section is supposed to be constant-pressure process. The performance of some selected hydrocarbons, hydrofluoroolefins, hydrofluoroethers, and hydrofluorocarbons refrigerants in the ERC is examined and compared. The behaviour of the ejector is represented by the ejector area ratio (EAR) and entrainment ratio (), whereas the cycle performance is represented by the coefficient of performance (COP). The impacts of some selected operating parameters as the condenser, evaporator, and generator temperatures on the ejector behaviour and cycle performances are also examined. The results show that the best ejector behaviour and cycle performance are achieved with the highest critical temperature dry refrigerant, i.e. cyclopentane under all examined operating conditions. From energy efficiency and environmental issues viewpoints, cyclopentane can be considered the most appropriate refrigerant amongst all examined working fluids. However, additional precautions should be taken against its flammability. The highest COP value, the corresponding ω, and the needed EAR using cyclopentane are 0.81, 1.03, and 17.3, respectively with a condenser temperature of 25 ºC and the typical values for the remaining operating parameters.

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Section: Processes and Mathematical Model Of The Ejectormentioning

confidence: 99%

Section: Processes and Mathematical Model Of The Ejectormentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A Parametric Analysis of an Ejector Refrigeration Cycle Activated by Renewable Energy

Saleh¹,

Tjprc²

2019

IJMPERD

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“…After that, many studies based their work on this theory. Dong et al realized ejector refrigeration using solar energy and industrial waste heat. Chen et al improved the performance of the adjustable ejector for the water heating system of a CO 2 heat pump.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Experimental Study of Ejector for Ladle Baking

Yuan

Feng

et al. 2018

steel research int.

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Current regenerative ladle preheating devices for steel plants are supposed to be equipped with an induced draft fan to suction high‐temperature flue gas, which flows through the regenerator and heats it simultaneously. Replacing the traditional draft fan of ladle preheaters with high‐pressure air of steel plants and ejectors is of great significance in energy conservation and emission reduction. The influence of the ejector nozzle diameter, nozzle to throat clearance, diffuser chamber structure, and primary gas inlet pressure on the ejector performance is analyzed through a combination of establishing a three‐dimensional ejector model and simulation work with the numerical simulation software Fluent. The optimal ejector design parameters are proposed and validated using experimental data. The research showed that the ejector can achieve the best performance with the parameters of 0.42 MPa inlet pressure for high‐pressure primary gas, 0.027 m ejector nozzle diameter, 0.11 m nozzle to throat clearance, 8° divergence angle of the diffuser, and 0.19 m length of diffuser chamber. The entrained mass flow rate of the secondary gas is 1.14 kg s−1 for the optimal ejector. The experimental results are consistent with those of the numerical simulation and verified that the optimal design of ejector device met the practical requirements.

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Thermodynamic investigation on low GWP drop‐in alternatives to HFC‐245fa in ejector refrigeration cycle for air condition application

Hao

Gao

Wang

et al. 2023

Asia-Pacific J Chem Eng

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The ejector refrigeration cycle (ERC) with HFC‐245fa can achieve high efficiency and reliability for air conditioning applications. However, because of its high global warming potential (GWP), HFC‐245fa needed to be phased out according to recent relative regulations. In this study, four promising alternatives to HFC‐245fa were investigated and evaluated, including HC‐600, HCFO‐1233zd(E), HFO‐1336mzz(Z), and HCFO‐1224 yd(Z). Besides their low GWP, these alternatives also have similar vapor pressure curves to HFC‐245fa, which represents a possibility for refrigerant drop‐in replacement in ERC. Thermodynamic real gas modeling of the ERC was adopted in this study for more accurate results, and a critical performance evaluation and comparison with those candidates in ERC were carried out. The results indicate that HCFO‐1233zd(E) and HCFO‐1224 yd(Z) are outstanding candidates for ERC according to the higher coefficient of performance, entrainment ratio, exergy efficiency, and lower pump power consumption, and the COP relative differences of these two refrigerants would reach 5.5% and 4.6%. HFO‐1336mzz(Z) consumes 33% less power at the pump than HFC‐245fa under the same conditions and refrigeration capacity. Minimal pump power consumption is its advantage. Although HC‐600 is prominent, with the largest coefficient of performance and entrainment ratio, its flammability is not conducive to its popularization. Machine learning is available to predict the performance of ejectors employing different refrigerants. This paper helps to properly select refrigerants for ERC and to pre‐evaluate the refrigerants' application under different working conditions.

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Performance analysis and working fluid selection for ejector refrigeration cycle

Cited by 81 publications

References 24 publications

A Parametric Analysis of an Ejector Refrigeration Cycle Activated by Renewable Energy

A Parametric Analysis of an Ejector Refrigeration Cycle Activated by Renewable Energy

Optimal Design and Experimental Study of Ejector for Ladle Baking

Thermodynamic investigation on low GWP drop‐in alternatives to HFC‐245fa in ejector refrigeration cycle for air condition application

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