Optimization of geometric parameters for design a high-performance ejector in the proton exchange membrane fuel cell system using artificial neural network and genetic algorithm

Maghsoodi, Ameneh; Afshari, Ebrahim; Ahmadikia, Hossein

doi:10.1016/j.applthermaleng.2014.06.067

Cited by 101 publications

(26 citation statements)

References 24 publications

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“…In the energy industry, they can be employed in industrial plants for exhaust gases [26], proton exchange membrane fuel cell (PEMFC) systems [27][28][29][30][31][32][33], chemical looping combustion (CLC) power plants [34,35] and transcritical CO 2 ejector refrigeration systems (TERS) [16,36]. Supersonic ejectors are used when there is a need to generate a high pressure difference: in the supersonic regime, the primary flow can entrain a high quantity of suction fluid because of the lower-pressure at the nozzle exit and high momentum transfer.…”

Section: Nozzle Designmentioning

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: Nozzle Designmentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

View full text Add to dashboard Cite

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“…37,38 The results of Zhu et al 37 showed that the optimum NXP increases from 1.7 to 3.4 times D m as the primary flow pressure rises from 4.5 to 6 bars, and thereby NXP is set as 12 mm (2 D m ) in this study. The chosen mixing section length (L m ) is 36 mm F I G U R E 3 Geometries of the multi-nozzle ejector (6 D m ) according to the results of Maghsoodi et al, 39 which is also in the recommended range from 5 to 10 D m by ESDU. 40 The diffuser length (L d ) has little effect on ejector performance at a small diameter ratio (D m /D t ), 34,41 and thereby a short diffuser (10D m ) is used.…”

Section: Preliminary Design Of Ejectorsmentioning

confidence: 99%

Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

et al. 2020

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Summary Due to its merit of no consuming energy, no moving part, and less requiring space, and maintenance, the ejector is one of the most promising hydrogen recirculation devices for proton exchange membrane fuel cell (PEMFC) applications. However, the prominent problem is its poor adaptability of the conventional ejector to meet the power range requirements of the PEMFC system. Thus, a multi‐nozzle ejector was investigated to widen the applicable power range of a PEMFC system. The designed multi‐nozzle ejector consists of one central nozzle (CN) and two symmetrical nozzles (SNs). The CN mode is activated under low power conditions, while the SNs mode is switched to adapt high power conditions. A 3D computational fluid dynamics (CFD) model was established to simulate the performance of ejectors, and an experimental test bench was built to validate the accuracy of the CFD model. The results indicated that the mixing chamber diameter (Dm) and throat tilt angle of SNs (αt) have a significant effect on the entrainment performance. It was found that the multi‐nozzle ejector can broaden the hydrogen supply range from 0.27 to 1.6 g/s (22‐100 kW) with the optimal combination of a Dm of 5.0 mm and αt of 8°. Nevertheless, the hydrogen supply range is 0.48 to 1.6 g/s (37‐100 kW) when using a conventional single‐nozzle ejector with a Dm of 5.0 mm. Moreover, the temperature, pressure, and relative humidity of the secondary flow have a great influence on the hydrogen entrainment ratio with the change of stack power.

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“…Ejectors may be used to replace the pumping recovery devices of the hydrogen not consumed by the system. Such replacement saves the electricity consumed by the pumping device and contributes to improve the overall efficiency of the plant [151][152][153][154].…”

Section: Fuel Cell Applicationsmentioning

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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Optimization of geometric parameters for design a high-performance ejector in the proton exchange membrane fuel cell system using artificial neural network and genetic algorithm

Cited by 101 publications

References 24 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

Performance investigation of a multi‐nozzle ejector for proton exchange membrane fuel cell system

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

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