Experimental Investigation of the Steam Ejector in a Single-Effect Thermal Vapor Compression Desalination System Driven by a Low-Temperature Heat Source

Dong, Jingming; Wang, Weining; Han, Zhitao; Ma, Hongbin; Deng, Yangbo; Su, Fengmin; Pan, Xinxiang

doi:10.3390/en11092282

Cited by 21 publications

(9 citation statements)

References 29 publications

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“…The developed model showed that disequilibrium condensations play a crucial role in the performance analysis of steam ejectors for MED-TVC. Xue et al, 2020 [124] Design and research of a two-stage vacuum ejector to improve performance of the MED + TVC desalination system [123,124,128,129,132,138], mathematical modeling of MVC coupled with MED [127,137,141], and hybridization systems of MVC [144,145] and TVC [131,139] with other desalination technologies.…”

Section: Vapor Compression System (Se-mvc)mentioning

confidence: 99%

Commercial Thermal Technologies for Desalination of Water from Renewable Energies: A State of the Art Review

Feria-Díaz¹,

López-Méndez²,

Sandoval-Herazo³

et al. 2021

Preprint

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Thermal desalination is yet a reliable technology in the treatment of brackish water and seawater; however, its demanding high energy requirements have lagged it compared to other non-thermal technologies such as reverse osmosis. This review provides an outline of the development and trends of the three most commercially used thermal or phase change technologies worldwide: Multi Effect Distillation (MED), Multi Stage Flash (MSF), and Vapor Compression Distillation (VCD). First, state of water stress suffered by regions with little fresh water availability and existing desalination technologies that could become an alternative solution are shown. The most recent studies published for each commercial thermal technology are presented, focusing on optimizing the desalination process, improving efficiencies, and reducing energy demands. Then, an overview of the use of renewable energy and its potential for integration into both commercial and non-commercial desalination systems is shown. Finally, research trends and their orientation towards hybridization of technologies and use of renewable energies as a relevant alternative to the current problems of brackish water desalination are discussed. This reflective and updated review will help researchers to have a detailed state of the art of the subject and to have a starting point for their research, since current advances and trends on thermal desalination are shown.

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Section: Vapor Compression System (Se-mvc)mentioning

confidence: 99%

Commercial Thermal Technologies for Desalination of Water from Renewable Energies: A State of the Art Review

Feria-Díaz¹,

López-Méndez²,

Sandoval-Herazo³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The results showed that the mixing chamber lengths of 5 and 15 mm yielded the lowest and highest ejector efficiency, respectively. Liu et al [9] and Dong et al [10] studied a two-phase flow ejector with variable geometry and found that the efficiency decreased with decreasing ejector area ratio. Yan et al [11] regarded the two ejectors as a whole and used two-dimensional Computational Fluid Dynamics (CFD) and experimental methods to explore the effect of key parameters on its performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

Liu

et al. 2020

Energies

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A two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. The effects of primary flow pressure (P P ) on the mixing process and flow phenomena were studied by a high-speed camera. The experimental results show that the ER first increases and then decreases with increasing P P . ER increases with increasing ejector area ratio (AR). The P P corresponding to the maximum ER of ejectors with a different nozzle exit position (NXP) is 3.6 bar. The ejector with an NXP of +1 and AR of 6 demonstrate the best performance, and the ER of this ejector reaches 36.29. The spray half-cone angle of the ejector increases with increasing ER, reaching a maximum value of 7.07 • . The unstable atomization half-cone angle is mainly due to a two-phase flow pulsating phenomenon. The pulsation period is 10 ms. In the present study, a general rule that provides a reference for ejector design and selection was obtained through experiments.

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“…Besides, the complex and non-linear turbulent effect on the fluid structure can be characterized to evaluate the mixing process and the wall shearing behaviours [21][22][23]. The simulation study of geometric parameters were mainly in terms of nozzle structure [24], the area ratio of nozzle throat to constant-area section [25,26], the NXP (nozzle exit position) [27][28][29], diffusion angle [30] and the structure of mixing chamber [31]. The influence of five different nozzle geometry on the flow characteristics inside the ejector was studied by Yang et al [32].…”

Section: Introductionmentioning

confidence: 99%

“…A better understanding of the mixing process of the working steam and the pumped steam under different back pressure was studies by Su and Agarwal [38]. According to the work of Dong et al [27], a higher COP can be obtained by decreasing the temperature of primary steam and raising the temperature of secondary steam.…”

Section: Introductionmentioning

confidence: 99%

A Steam Ejector Refrigeration System Powered by Engine Combustion Waste Heat: Part 2. Understanding the Nature of the Shock Wave Structure

et al. 2019

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In general, engine fuel combustion generates 30% waste heat, which is disposed to the environment. The use of the steam ejector refrigeration to recycle the waste heat and transfer them to useful energy source could be an environmentally friendly solution to such an issue. The steam ejector is the main component of the ejector refrigeration system, which can operate at a low-temperature range. In this article, the internal shock wave structure of the ejector is comprehensively studied through the computation fluid dynamics (CFD) approach. The shock wave structure can be subdivided into two regions: firstly the pseudo-shock region consisting of shock train and co-velocity region; secondly the oblique-shock region composed of a single normal shock and a series of oblique shocks. The effect of the shock wave structure on both pumping performance and the critical back pressure were investigated. Numerical predictions indicated that the entrainment ratio is enhanced under two conditions including (i) a longer pseudo-shock region and (ii) when the normal shock wave occurs near the outlet. Furthermore, the system is stabilized as the back pressure and its disturbance is reduced. A critical range of the primary fluid pressure is investigated such that the pumping is effectively optimized.

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Experimental Investigation of the Steam Ejector in a Single-Effect Thermal Vapor Compression Desalination System Driven by a Low-Temperature Heat Source

Cited by 21 publications

References 29 publications

Commercial Thermal Technologies for Desalination of Water from Renewable Energies: A State of the Art Review

Commercial Thermal Technologies for Desalination of Water from Renewable Energies: A State of the Art Review

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

A Steam Ejector Refrigeration System Powered by Engine Combustion Waste Heat: Part 2. Understanding the Nature of the Shock Wave Structure

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