Thermodynamic comparison of ejector cooling cycles. Ejector characterisation by means of entrainment ratio and compression efficiency

Carrillo, José Antonio Expósito; Flor, Francisco José Sánchez de la; Lissén, José Manuel Salmerón

doi:10.1016/j.ijrefrig.2016.11.006

Cited by 33 publications

(9 citation statements)

References 41 publications

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“…Power is produced in the KNC and heat which is released from the KNC is regained by transferring it to the ERC in order to generate refrigeration. ERC is preferred to be occupied in the cycle since ERC has the capability of producing cooling effect with high efficiency by using low temperature sources [42][43][44]. Hence, ERC is quite suitable to regain the low-temperature waste heat of KNC in this present study.…”

Section: Introductionmentioning

confidence: 94%

“…Shock occurs at "b" in Figure 3 and after the shock, the flow characteristics transfers into subsonic from supersonic flow. Rankine-Hugoniot equations are utilized to obtain the properties of the fluid after the shock occurs [43,56]. Related equations are given below in which subscript "b" signifies "after-shock" thermodynamic properties of the refrigerant.…”

Section: Erc Analysismentioning

confidence: 99%

See 1 more Smart Citation

Energy and Exergy Analysis of an Innovative Power/Refrigeration Cycle: Kalina Cycle and Ejector Refrigeration Cycle

Seçkin

2023

International Journal of Advances in Engineering and Pure Sciences

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This study presents a thermodynamic analysis of a new combined power/refrigeration combined cycle. The combined cycle is comprised of two innovative cycles: Kalina cycle (KNC) and ejector refrigeration cycle (ERC) for power and refrigeration production, respectively. Recovery of heat process is involved in the design of the cycle to rise the energetic and exergetic efficiencies: emitted heat by the KNC is absorbed by the ERC in order to generate cooling. Effects of variation in KNC operational conditions which have direct effects on turbine power production capacity (temperature and pressure of the working fluid flow at the turbine inlet) on performance evaluation parameters of the system (energy efficiency, exergy efficiency, energetic and exergetic content of produced refrigeration and net power) are investigated. A detailed discussion of the results is also reported. Energetic and exergetic efficiency results are substantially dominated by generated power, i.e., KNC parameters which impose direct effect on turbine power production performance is of superior importance to rise the energy and exergy efficiencies.

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Section: Introductionmentioning

confidence: 94%

Section: Erc Analysismentioning

confidence: 99%

Energy and Exergy Analysis of an Innovative Power/Refrigeration Cycle: Kalina Cycle and Ejector Refrigeration Cycle

Seçkin

2023

International Journal of Advances in Engineering and Pure Sciences

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“…Preliminary performance estimates of the new solar-assisted cycle based on R152a indicate a COP improvement of 22.8% over the conventional hybrid cycle. In the context of air conditioning conditions, Expósito Carrillo et al [318] compared a number of combined ERS cycles (hybrid, multi-stage, cascade, booster with economiser, with both ejectors jet pumps and gas ejectors). Evaluation of the refrigerants R134a, R1234yf and R600a led to the selection of R600a with expected performance improvements in the order of 26% for the ejector expansion refrigeration cycle.…”

Section: Combined Ers Theoretical Studiesmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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Ejectors used in refrigeration systems as entrainment and compression components or expanders, alone or in combination with other equipment devices, have gained renewed interest from the scientific community as a means of low temperature heat recovery and more efficient energy use. This paper summarizes the main findings and trends, in the area of heat-driven ejectors and ejector-based machines, using low boiling point working fluids, which were reported in the literature for a number of promising applications. An overall view of such systems is provided by discussing the ejector physics principles, as well as a review of the main developments in ejectors over the last few years. Recent achievements on thermally activated ejectors for single-phase compressible fluids are the main focus in this part of the review. Aspects related to their design, operation, theoretical and experimental approaches employed, analysis of the complex interacting phenomena taking place within the device, and performance are highlighted. Conventional and improved ejector refrigeration cycles are discussed. Some cycles of interest employing ejectors alone or boosted combinations are presented and their potential applications are indicated.

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“…Yan et al [ 17 ] presented a compression heat pump cycle driven by solar energy with R134a and R1234yf; they pointed out that the heating exergy efficiency increased by about 52.8% compared with the conventional system. Expósito Carrillo et al [ 18 ] proposed a novel ejector efficiency used in the thermodynamic methods to improve the cooling system performance with R1234yf, and the system COP can increase to 2.794 with an improvement of about 26% under the same conditions. Zhang et al [ 19 , 20 ] presented a new ejector cooling system with a thermal pumping effect (ECSTPE) and double evacuation chambers and investigated the effects of refrigerants including R1234yf, R134a and R141b on system performance.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design and Performance Evaluation of R1234yf Ejectors for Ejector-Based Refrigeration Systems

Wang

et al. 2022

Entropy

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With the increasingly serious energy and environmental problems, the R1234yf ejector refrigeration system (ERS) shows great development potential in the refrigeration industry due to its simplicity, low maintenance costs and environmentally friendly nature. However, poor ejector performance has always been the main bottleneck for system applications. In order to overcome this problem, this paper proposes a design method for R1234yf ejectors based on the gas dynamic method and optimizes the geometrical parameters including the area ratio (AR) and nozzle exit position (NXP) to improve its performance through the control variable optimization algorithms. Based on the validated simulation model, the results show that the entrainment ratio increases initially and then decreases with the increase in AR and NXP, respectively; the AR has a significant effect on the shock wave position in the mixing chamber and the NXP can directly influence the expansion state of motive fluid; the ejector performance increases by about 17% over the initial entrainment ratio by the control variable optimization algorithms. This work can guide the R1234yf ejector design and promote the development of the ERS with environmentally friendly working fluids.

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Thermodynamic comparison of ejector cooling cycles. Ejector characterisation by means of entrainment ratio and compression efficiency

Cited by 33 publications

References 41 publications

Energy and Exergy Analysis of an Innovative Power/Refrigeration Cycle: Kalina Cycle and Ejector Refrigeration Cycle

Energy and Exergy Analysis of an Innovative Power/Refrigeration Cycle: Kalina Cycle and Ejector Refrigeration Cycle

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Optimization Design and Performance Evaluation of R1234yf Ejectors for Ejector-Based Refrigeration Systems

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