Exergy Analysis of Directional Solvent Extraction Desalination Process
This paper presents an exergy analysis to evaluate the performance of a continuous directional solvent extraction (DSE) desalination process using octanoic acid. The flow of exergy was calculated for each thermodynamic state and balanced for different components of the system to quantify the ineffic...
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MDPI AG
2019-03-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/21/3/321 |
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| author | Sorour Alotaibi Osama M. Ibrahim Yu Wang Tengfei Luo |
| author_facet | Sorour Alotaibi Osama M. Ibrahim Yu Wang Tengfei Luo |
| author_sort | Sorour Alotaibi |
| collection | DOAJ |
| description | This paper presents an exergy analysis to evaluate the performance of a continuous directional solvent extraction (DSE) desalination process using octanoic acid. The flow of exergy was calculated for each thermodynamic state and balanced for different components of the system to quantify the inefficiencies in the process. A parametric study was performed to evaluate the impact of three critical design variables on exergy consumption. The parametric study reveals that the total exergy input decreases significantly with an increase in heat exchanger effectiveness. The results also indicate that the heat exchangers account for the highest exergy destruction. The total exergy consumption, however, has a slightly declining trend as the recovery-ratio increases. There is a small variation in the total exergy consumption, within the uncertainty of the calculation, as the highest process temperature increases. When compared to conventional desalination processes, the exergy consumption of the DSE, with heat recovery of 90%, is comparable to those of multi-stage flashing (MSF), but much higher than reverse osmosis (RO). Octanoic acid, which has low product water yield, is identified as the primary factor negatively impacting the exergy consumptions. To exploit the low-grade and low-temperature heat source feature of the DSE process, directional solvents with higher yield should be identified or designed to enable its full implementation. |
| first_indexed | 2024-04-11T18:45:23Z |
| format | Article |
| id | doaj.art-9663debef77741619e45e6bd053c8c74 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T18:45:23Z |
| publishDate | 2019-03-01 |
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| series | Entropy |
| spelling | doaj.art-9663debef77741619e45e6bd053c8c742022-12-22T04:08:50ZengMDPI AGEntropy1099-43002019-03-0121332110.3390/e21030321e21030321Exergy Analysis of Directional Solvent Extraction Desalination ProcessSorour Alotaibi0Osama M. Ibrahim1Yu Wang2Tengfei Luo3Mechanical Engineering Department, Faculty of Engineering and Petroleum, Kuwait University, Safat 13060, KuwaitMechanical Engineering Department, Faculty of Engineering and Petroleum, Kuwait University, Safat 13060, KuwaitDepartment of Aerospace and Mechanical Engineering, College of Engineering, University of Notre Dame, Notre Dame, IN 46556, USADepartment of Aerospace and Mechanical Engineering, College of Engineering, University of Notre Dame, Notre Dame, IN 46556, USAThis paper presents an exergy analysis to evaluate the performance of a continuous directional solvent extraction (DSE) desalination process using octanoic acid. The flow of exergy was calculated for each thermodynamic state and balanced for different components of the system to quantify the inefficiencies in the process. A parametric study was performed to evaluate the impact of three critical design variables on exergy consumption. The parametric study reveals that the total exergy input decreases significantly with an increase in heat exchanger effectiveness. The results also indicate that the heat exchangers account for the highest exergy destruction. The total exergy consumption, however, has a slightly declining trend as the recovery-ratio increases. There is a small variation in the total exergy consumption, within the uncertainty of the calculation, as the highest process temperature increases. When compared to conventional desalination processes, the exergy consumption of the DSE, with heat recovery of 90%, is comparable to those of multi-stage flashing (MSF), but much higher than reverse osmosis (RO). Octanoic acid, which has low product water yield, is identified as the primary factor negatively impacting the exergy consumptions. To exploit the low-grade and low-temperature heat source feature of the DSE process, directional solvents with higher yield should be identified or designed to enable its full implementation.https://www.mdpi.com/1099-4300/21/3/321desalinationdirectional solvent extractionoctanoic acidsecond-law analysisexergy analysis |
| spellingShingle | Sorour Alotaibi Osama M. Ibrahim Yu Wang Tengfei Luo Exergy Analysis of Directional Solvent Extraction Desalination Process Entropy desalination directional solvent extraction octanoic acid second-law analysis exergy analysis |
| title | Exergy Analysis of Directional Solvent Extraction Desalination Process |
| title_full | Exergy Analysis of Directional Solvent Extraction Desalination Process |
| title_fullStr | Exergy Analysis of Directional Solvent Extraction Desalination Process |
| title_full_unstemmed | Exergy Analysis of Directional Solvent Extraction Desalination Process |
| title_short | Exergy Analysis of Directional Solvent Extraction Desalination Process |
| title_sort | exergy analysis of directional solvent extraction desalination process |
| topic | desalination directional solvent extraction octanoic acid second-law analysis exergy analysis |
| url | https://www.mdpi.com/1099-4300/21/3/321 |
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