A novel steam ejector with pressure regulation to optimize the entrained flow passage for performance improvement in MED-TVC desalination system

Tang, Yongzhi; Liu, Zhongliang; Shi, Chong; Li, Yanxia

doi:10.1016/j.energy.2018.06.028

Cited by 59 publications

(8 citation statements)

References 43 publications

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“…Moreover, a supersonic steam ejector shows great advantages including simple structure, easy operation and high reliability [5]. It, therefore, has been used in various industrial processes, such as refrigeration system [6], seawater desalination [7], and solar energy utilization [8], and steam generation system [9]. Strusnik et al [10] investigated the effect of noncondensable gas on the heat transfer behaviour in a steam turbine condenser and modelling of the steam ejector pump system by controlling the gas extraction rate through extraction tubes.…”

Section: Introductionmentioning

confidence: 99%

Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation

et al. 2019

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Supersonic ejectors are of great interest for various industries as they can improve the quality of the low-grade heat source in an eco-friendly and sustainable way. However, the impact of steam condensation on the supersonic ejector performances is not fully understood and is usually neglected by using the dry gas assumptions. The non-equilibrium condensation occurs during the expansion and mixing process and is tightly coupled with the high turbulence, oblique and expansion waves in supersonic flows. In this paper, we develop a wet steam model based on the computational fluid dynamics to understand the intricate feature of the steam condensation in the supersonic ejector. The numerical results show that the dry gas model exaggerates the expansion characteristics of the primary nozzle by 21.95%, which predicts the Mach number of 2.00 at the nozzle exit compared to 1.64 for the wet steam model. The dry gas model computes the static temperature lower to 196 K, whereas the wet steam model predicts the static temperature should above the triple point due to the phase change process. The liquid fraction can reach 7.2% of the total mass based on the prediction of the wet steam model. The performance analysis indicates that the dry gas model overestimates a higher entrainment ratio by 11.71% than the wet steam model for the steam ejector.

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Section: Introductionmentioning

confidence: 99%

Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation

et al. 2019

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“…A CFD analysis of the geometry and internal flow structure indicated that an optimum combination of geometric parameters may be found for the entrainment ratio at each back pressure selected. The concept was applied for cases of MED-TVC desalination systems (multi-effect desalination system with thermal vapor compression) [38,39]. Along a similar line of reasoning, Tang et al [37] introduced the concept of auxiliary entrainment under the ejector's critical operating conditions, resulting in the geometry depicted in Figure 9.…”

Section: Ejector Geometrymentioning

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 thermodynamic analysis illustrated that the novel design improved the exergy efficiency by 57.5%. Tang et al [13] designed a new steam ejector with pressure regulation and the optimisation improved entrainment ratios by 11.77%. Tang et al [14] also reported that the multi-optimisation of the entrainment Please find the published version at: https://www.sciencedirect.com/science/article/abs/pii/S0011916420306974 passage can lead to an improvement of the entrainment ratio of 28.75% for the newly designed steam ejector for 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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A novel steam ejector with pressure regulation to optimize the entrained flow passage for performance improvement in MED-TVC desalination system

Cited by 59 publications

References 43 publications

Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation

Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation

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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