Design and numerical investigation of an adaptive nozzle exit position ejector in multi-effect distillation desalination system

Wang, Chen; Wang, Lei; Wang, Xinli

doi:10.1016/j.energy.2017.08.104

Cited by 57 publications

(15 citation statements)

References 34 publications

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“…Thongtip and Aphornratana (2017) studied the impact of nozzle geometry on the performance of an ejector using R141b as the refrigerant. Wang et al (2017) investigated an ejector with an auto-tuning capability to regulate the performance of a multi-effect distillation-thermal vapor compression desalination system. An optimal nozzle exit position was shown to exist and a correlation between the optimum nozzle exit position and the primary pressure was presented.…”

Section: Artmentioning

confidence: 99%

Energetic Optimization and Exergetic Performance Investigation of an Ejector System Using HCFO-1233zd(E) as a Refrigerant

Mwesigye¹,

Kiamari²,

Dworkin³

2023

Preprint

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In this study, the performance of an ejector refrigeration system using HCFO-1233zd(E) as the working fluid is investigated and presented. A novel improved modeling approach that considers ejector loss coefficients as functions of the ejector pressure lift and area ratio has been used. The resulting mathematical model developed using the first and second laws of thermodynamics and gas dynamics is solved using Engineering Equation Solver. Different ejector geometries with area ratios of 6.44, 7.04, 7.51, 7.73, 8.28, 8.62, 9.13, 9.41 and 10.64 were used in this study. The evaporator temperatures were between 0 °C and 16 °C, the generator temperatures were between 75 °C and 120 °C and the condensing temperatures varied between 20 °C and 40 °C. For the range of parameters used, the optimal coefficient of performance (COP) is in the range 0.11 and 0.88 for evaporator temperatures between 4 °C and 16 °C. At the optimal working conditions, the COP improves with higher area ratios, lower condensing temperatures and requires increased generator temperatures. In the critical mode of operation, both the energetic and exegetic performance of the ejector are shown to decline as generator temperatures increase, evaporator temperatures reduce and as the area ratios decrease. Thermodynamic investigation using the exergy analysis method indicates that most of the exergetic losses come from the ejector (46-56%) followed by the condenser (18-29%), the generator (21-26%), the evaporator (0.8-3%), and the throttle valve (1- 1.6%), with the pump having a very small contribution. Moreover, correlations for the optimal generator and optimal COP were derived and presented. Keywords: Coefficient of performance, Critical mode, Ejector refrigeration system, Ejector loss coefficients, Exergetic performance, Hydroflouroolefins

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Section: Artmentioning

confidence: 99%

Energetic Optimization and Exergetic Performance Investigation of an Ejector System Using HCFO-1233zd(E) as a Refrigerant

Mwesigye¹,

Kiamari²,

Dworkin³

2023

Preprint

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“…In order to regulate and enhance the performance of a MED-TVC desalination system, Wang et al [104] proposed a new adaptive nozzle exit position (ANXP) device ( Figure 15a) to enhance ejector performance by self-adjusting the position of the primary nozzle with the change of primary pressure. The mechanism relies on bellows fixed to the ejector in such a way that the variation in primary pressure results in an axial displacement of the primary nozzle, thus varying NXP.…”

Section: Variable Geometry Ejector (Vge)mentioning

confidence: 99%

“…Internal adjustment mechanisms: (a) self-positioning nozzle[104]; (b) self-adjusting spindle[105]; (c) nozzle and spindle shape[106].…”

mentioning

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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“…The studies on steam ejectors for MED-TVC seawater desalination system including the novel design [9], thermodynamic analysis [10] and optimisation studies [11]. Ghaebi and Abbaspour [12] integrated heat recovery steam generators to MED-TVC seawater desalination systems.…”

Section: Introductionmentioning

confidence: 99%

Performance of steam ejector with nonequilibrium condensation for multi-effect distillation with thermal vapour compression (MED-TVC) seawater desalination system

2020

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The single-phase and two-phase flow models are developed and compared for the performance evaluation of a steam ejector for the multi-effect distillation with thermal vapour compression (MED-TVC) seawater desalination system. The results show that a single-phase flow model with ignoring the phase change predicts an unphysical temperature of the steam in the supersonic flow with the minimum value of approximately 122 K, which raises the query of the formation of the ice. The two-phase wet steam model corrects the distribution of the flow parameter by predicting the heat and mass transfer during the phase change. The steam achieves the first nonequilibrium condensation process inside the primary nozzle and another four alternating condensation and re-evaporation processes. The single-phase flow model underpredicts the entropy loss coefficient by approximately 15% than the two-phase wet steam model. The performance comparison is achieved against the single-phase model

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Design and numerical investigation of an adaptive nozzle exit position ejector in multi-effect distillation desalination system

Cited by 57 publications

References 34 publications

Energetic Optimization and Exergetic Performance Investigation of an Ejector System Using HCFO-1233zd(E) as a Refrigerant

Energetic Optimization and Exergetic Performance Investigation of an Ejector System Using HCFO-1233zd(E) as a Refrigerant

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

Performance of steam ejector with nonequilibrium condensation for multi-effect distillation with thermal vapour compression (MED-TVC) seawater desalination system

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