Evaluation of the effects of entrainment ratios on the performance parameters of a refrigeration machine having dual evaporator ejector system with R134a and R456A

İşkan, Ümit; Di̇rek, Mehmet

doi:10.1016/j.tsep.2022.101345

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…Rostamzadeh and Nourani 15 replaced the condenser with a thermo-electric generator in an existing solar-powered ejector cooling system to improve its performance. Iskan and Direk 16 performed an experimental analysis of a dual-evaporator ejector refrigeration system using environment friendly refrigerants R1234ze (E), R515a, R456a, and R516a. They found that the cooling capacity of R515a and R1234ze(E) was lesser by 11% and 5% but the COP was higher by 1% and 9%, respectively, than that of R134a.…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of ejector‐enhanced dual‐evaporator cycle using effective temperature method

Anuradha

2024

Heat Trans

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This study compares the exergy of an ejector‐based two evaporator cycle (EB‐TEC) with a conventional two evaporator cycle (C‐TEC). The analysis utilizes a modified Gouy–Stodola equation, which provides a more accurate insight of the system irreversibility compared to the standard Gouy–Stodola formulation. Furthermore, the comparison includes three working fluids, that is, R134a, R1234ze, and R600 in both the cycles. The study examines the effects of varying evaporators and condenser temperatures and the dryness fraction at the exit of Evaporator 1. The data is analyzed using an Engineering Equation Solver. The findings indicate that increasing the temperature of the low‐temperature evaporator leads to a drop in exergy losses and enhancement in exergy efficiency in both the cycles. When the temperature of Evaporator 1 is increased, the total exergy of the EB‐TEC is decreased but for the C‐TEC, it is increased. Furthermore, increasing the condenser temperature results in higher exergy destruction in both EB‐TEC and C‐TEC. Notably, the maximum exergy destruction is 49.44 kW for R600, whereas the minimum exergy destruction is 14.42 kW for R1234ze in the EB‐TEC.

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Section: Introductionmentioning

confidence: 99%

Exergy analysis of ejector‐enhanced dual‐evaporator cycle using effective temperature method

Anuradha

2024

Heat Trans

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“…Subcooled boiling as an efficient heat transfer method has been applied in many fields; for example, commercial refrigeration, the electronics industry, nuclear power and the aerospace industry [1][2][3][4][5]. During subcooled flow boiling, the bubble with non-zero velocity typically slides along the heating wall until departure and annihilation.…”

Section: Introductionmentioning

confidence: 99%

Bubble Sliding Characteristics and Dynamics of R134a during Subcooled Boiling Flow in a Narrow Gap

Wang

Xie

et al. 2023

Mathematics

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The numerical method was used to study bubble sliding characteristics and dynamics of R134a during subcooled flow boiling in a narrow gap. In the numerical method, the volume of fraction (VOF) model, level set method, Lee phase change model and the SST k − ω turbulent model were adopted for the construction of the subcooled flow boiling model. In order to explore bubble sliding dynamics during subcooled flow boiling, the bubble sliding model was introduced. The bubble velocity, bubble departure diameter, sliding distance and bubble sliding dynamics were investigated at 0.2 to 5 m/s inlet velocities. The simulation results showed that the bubble velocity at the flow direction was the most important contribution to bubble velocity. Additionally, the bubble velocity of 12 bubbles mostly oscillated with time during the sliding process at 0.2 to 0.6 m/s inlet velocities, while the bubble velocity increased during the sliding process due to the bubble having had a certain inertia at 2 to 5 m/s inlet velocities. It was also found that the average bubble velocity in flow direction accounted for about 80% of the mainstream velocities at 0.2 to 5 m/s. In the investigation of bubble sliding distance and departure diameter, it was concluded that the ratio of the maximum sliding distance to the minimum sliding distance was close to two at inlet velocities of 0.3 to 5 m/s. Moreover, with increasing inlet velocity, the average sliding distance increased significantly. The average bubble departure diameter obviously increased from 0.2 to 0.5 m/s inlet velocity and greatly reduced after 0.6 m/s. Finally, the investigations of the bubble sliding dynamics showed that the surface tension dominated the bubble sliding process at 0.2 to 0.6 m/s inlet velocities. However, the drag force dominated the bubble sliding process at 2 to 5 m/s inlet velocities.

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“…Yaptıkları çalışma ile ER oranının 0,4 ve 0,8 olduğu aralıkta, soğutma sisteminin daha etkin çalışabileceğini kanıtlamışlardır [25].…”

Section: Introductionunclassified

R515A soğutucu akışkanlı tek kompresör ve iki buharlaştırıcılı deneysel soğutma sisteminde ejektör sürüklenme oranının ve yoğuşma sıcaklığının performans parametrelerine etkisinin incelenmesi

İşkan¹,

ÇETİN²,

Kahraman³

et al. 2023

JIENS

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Evaluation of the effects of entrainment ratios on the performance parameters of a refrigeration machine having dual evaporator ejector system with R134a and R456A

Cited by 9 publications

References 25 publications

Exergy analysis of ejector‐enhanced dual‐evaporator cycle using effective temperature method

Exergy analysis of ejector‐enhanced dual‐evaporator cycle using effective temperature method

Bubble Sliding Characteristics and Dynamics of R134a during Subcooled Boiling Flow in a Narrow Gap

R515A soğutucu akışkanlı tek kompresör ve iki buharlaştırıcılı deneysel soğutma sisteminde ejektör sürüklenme oranının ve yoğuşma sıcaklığının performans parametrelerine etkisinin incelenmesi

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