Exergy analysis of major recirculating multi-stage flash desalting plants in Saudi Arabia

Al‐Sulaiman, Fahad A.; Ismail, B.

doi:10.1016/0011-9164(95)00079-8

Cited by 24 publications

(6 citation statements)

References 5 publications

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“…From a second-law viewpoint, we note that the efficiency is very low, approximately equal to 2.4. This order of magnitude is expected and is always found by different authors [7][8][9][10][11][12][13][14][15][16] depending on the type and the size of the unit. The explanation resides in the combination of a number of irreversible processes in each component of the plant i.e.…”

Section: Resultssupporting

confidence: 68%

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Second-Law Analysis of a Double-Effect Evaporator with Thermal Vapor Compression

Snoussi

BenHamad

2021

J. Adv. Therm. Sci. Res.

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In this paper, we present a steady-state analysis of a double-effect evaporator with thermal vapor compression (MED-TVC) installed in the Tunisian Chemical Group (GCT) factory. A thermodynamic model including mass and energy balances of the system is developed and integrated in a Matlab program. The model resolution yields to the determination of the operating parameters of the plant and the Gain Output Rate (GOR) was found to be roughly equal to 5. In a second step, the simulation results served to conduct a second law analysis of the unit. The performance criterion used in this analysis is the second law efficiency, i.e., the ratio of the least theoretical work of separation to the actual work input to the plant. The second law efficiency was found to be 2.4%. The distribution of the irreversibility between the different components of the plant was, in addition, assessed. As a conclusion, it was established that the most irreversibility occurs in the thermo-compressor which contributes with more than 50% to the global imperfection and which presents an exergy efficiency of less than 77%. The remaining irreversibility comes from the three exchangers (the two evaporators and the condenser) with an average contribution of 16%. As it is very difficult to introduce modifications into an existing unit, we assume that the importance of the results is not limited to the studied unit. They serve, rather, as an aid to the future design of a MED-TVC plant.

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Section: Resultssupporting

confidence: 68%

“…During the last decade, numerous papers have dealt with second law analysis of desalination plants [7][8][9][10][11][12][13][14][15][16]. Different second-law performance criteria, i.e.…”

Section: Introductionmentioning

confidence: 99%

Second-Law Analysis of a Double-Effect Evaporator with Thermal Vapor Compression

Snoussi

BenHamad

2021

J. Adv. Therm. Sci. Res.

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“…In these analyses, different models have been adopted to estimate the thermodynamic properties of seawater. Frequently, seawater has been represented by aqueous sodium chloride solutions of equivalent salt content or salinity [1][2][3]. 3 Although sodium chloride is the major constituent in seawater, such matching does not bring all important properties of the two solutions into agreement [4].…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have performed exergy analysis of seawater desalination systems [1][2][3][4][5][6][7][8][9][10][11][12][13] including multistage flash (MSF), multi-effect distillation (MED), reverse osmosis (RO), mechanical vapor compression (MVC) and thermal vapor compression (TVC). In these analyses, different models have been adopted to estimate the thermodynamic properties of seawater.…”

Section: Introductionmentioning

confidence: 99%

On exergy calculations of seawater with applications in desalination systems

Sharqawy

Lienhard

Zubair

2011

International Journal of Thermal Sciences

154

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Exergy analysis is a powerful diagnostic tool in thermal systems performance evaluation.The use of such an analysis in seawater desalination processes is of growing importance to determine the sites of the highest irreversible losses. In the literature, exergy analyses of seawater desalination systems have sometimes modeled seawater as sodium chloride solutions of equivalent salt content or salinity; however, such matching does not bring all important properties of the two solutions into agreement. Furthermore, a common model that represents seawater as an ideal mixture of liquid water and solid sodium chloride may have serious shortcomings. Therefore, in this paper, the most up-to-date thermodynamic properties of seawater, as needed to conduct an exergy analysis, are given as correlations and tabulated data. The effect of the system properties as well as the environment dead state on the exergy and flow exergy variation is investigated. In addition, an exergy analysis for a large MSF distillation plant is performed using plant operating data and results previously published using the above-mentioned ideal mixture model. It is demonstrated that this ideal mixture model gives flow exergy values that are far from the correct ones. Moreover, the second law efficiency differs by about 80% for some cases.

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“…In this regard, different models have been adopted to estimate the thermodynamic properties of seawater. Frequently, seawater has been represented by aqueous sodium chloride solutions of equivalent salt content or salinity [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Formulation of Seawater Flow Exergy Using Accurate Thermodynamic Data

Sharqawy

Lienhard

Zubair

2010

Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climat

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Seawater is a complex electrolyte solution of water and salts with sodium chloride as the major constituent. However, the thermodynamic properties of seawater are considerably different from those of aqueous sodium chloride solution. In the literature, exergy analyses of seawater desalination systems have sometimes modeled seawater by sodium chloride solutions of equivalent salt content or salinity; however, such matching does not bring all important properties of the two solutions into agreement. Further, some published studies attempt to represent sodium chloride solutions as a specific model for an ideal mixture of liquid water and solid sodium chloride, which is shown to have serious shortcomings. In this paper, the most up-to-date thermodynamic properties of seawater are compared with those of aqueous sodium chloride solution as well as the ideal mixture model. The flow exergy is calculated using various models and the results are compared. In addition, the minimum desalination work required to produce a unit mass of fresh water from seawater of varying salinity is calculated using these models. A difference of about 50% in the minimum desalination work is observed when calculating separation work using the ideal mixture model. This consequently shows that exergy analysis and the second law efficiency calculations performed using the ideal mixture model in question are comparatively far from the actual values. NOMENCLATURE

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Exergy analysis of major recirculating multi-stage flash desalting plants in Saudi Arabia

Cited by 24 publications

References 5 publications

Second-Law Analysis of a Double-Effect Evaporator with Thermal Vapor Compression

Second-Law Analysis of a Double-Effect Evaporator with Thermal Vapor Compression

On exergy calculations of seawater with applications in desalination systems

Formulation of Seawater Flow Exergy Using Accurate Thermodynamic Data

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