The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

Ersoy, H. Kursad; Bilir, Nagihan

doi:10.1504/ijex.2010.033412

Cited by 37 publications

(20 citation statements)

References 12 publications

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“…Bilir and Ersoy [159,305] studied the performance improvement of EERS over the standard cycle using the R134a refrigerant: the COP was found to increase by 10.1-22.34%, and the reduction in exergy destruction was found to be up 58.7%. The COP improvement increases with T c .…”

Section: Ejector Expansion Refrigeration System (Eers)mentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

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a b s t r a c tThe increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

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Section: Ejector Expansion Refrigeration System (Eers)mentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

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“…In all theoretical and experimental studies conducted on ejector expander refrigeration/heat pump cycles, the performance coefficient has been shown to be higher than that in basic systems. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Recently, there has been increasing research on the transcritical carbon dioxide refrigeration cycle, because CO 2 has excellent thermodynamics and transport properties and it is an environmentally friendly refrigerant with zero ozone depleting potential and negligible (¼1) global warming potential. Carbon dioxide is a natural substance and does not have to be produced, especially as refrigerant.…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics of ejector expander transcritical CO₂ refrigeration cycle

Ersoy

Bilir

2012

Proceedings of the Institution of Mechanical Engineers, Part A:

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The effects on the performance of the basic CO 2 refrigeration cycle when using an ejector as the expander to recover expansion work were investigated. A two-phase constant area ejector flow model was used in the ejector analysis. The coefficient of cooling performance and gas cooler pressure that yielded the maximum exergy efficiency, suction nozzle pressure drop, and optimum values for the ejector area ratio were determined for various evaporator and gas cooler outlet temperatures. Parametric studies were performed using engineering equation solver. The suction nozzle pressure drop had a significant effect on the ejector area ratio, coefficient of cooling performance, and exergy efficiency. It is necessary to design an ejector with the optimum area ratio to achieve the optimum pressure drop and maximum performance. Cycle that use the ejector as an expander always has higher coefficient of performance and exergy efficiency than conventional cycle under any operating condition. The irreversibility decreases compared to the classic refrigeration cycle when the ejector or turbine are used as an expander. The analysis results showed that -under a gas cooler pressure of 9.5 MPa, gas cooler outlet temperature of 40 C, evaporator temperature of 5 C, and cooling capacity of 3.5 kW -the total irreversibility of the ejector system was lower than those of the basic and turbine expander systems by 39.1% and 5.46%, respectively.

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“…At the same operating temperature using a constant area ejector COP and its EER is higher than of the system using a constant pressure ejector as reported [13]. Bilir and Ersoy [14] also report on theoretical studies using R134a. In off-design conditions, the system shows higher COP values than conventional systems and by using COP constant area ejector can be increased by 22.3% depending on operating conditions.…”

Section: Introductionmentioning

confidence: 52%

Comparative Analysis of Performance between Two Phase Ejector with Accomulator and COS Split Air-Conditioning Dual Evaporator

Arsana¹,

Kusuma²,

Sucipta³

et al. 2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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The purpose of this study is to increase the coefficient of performance (COP) of the split air conditioner (SAC) by reducing the compressor work and increasing cooling capacity which can be achieved with a two phase ejector as an expansion device with novel design dual evaporator temperature. Numerical methods implementing mathematical model developed in EES software. The EES modelling is used to simulate the influence of key parameters of the ejector to overall system performance of the split air conditioner (SAC). Such key parameters include entrainment ratio involving mass flow rate of secondary and primary flow in the ejector and pressure lift ratio comprising pressure in suction and diffuser sections. Performance analysis of the SAC system with a two-phase ejector is performed to reach ASHRAE Standard requirement of a constant COP for SAC application minimum of 3.5. The SAC system simulated is charged with R-290 as the fluid medium of cooling capacity at least 4000 BTU/hr based on numerical model simulation results the ejector is then produced and installed in a modified SAC system. Experimental test system is set to experimentally investigate and comparation analisys the actual performance of the ejector and its effect to the novel design dual evaporator temperature COS-SAC system performance. The SAC system performance with ejector is also found to be significantly improved is about 35 % greater than those of conventional expansion device system.

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The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

Cited by 37 publications

References 12 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

Performance characteristics of ejector expander transcritical CO₂ refrigeration cycle

Comparative Analysis of Performance between Two Phase Ejector with Accomulator and COS Split Air-Conditioning Dual Evaporator

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The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

Cited by 37 publications

References 12 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

Performance characteristics of ejector expander transcritical CO2 refrigeration cycle

Comparative Analysis of Performance between Two Phase Ejector with Accomulator and COS Split Air-Conditioning Dual Evaporator

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Performance characteristics of ejector expander transcritical CO₂ refrigeration cycle