Entropy Generation Minimization for Energy-Efficient Desalination
Desalination systems can be conceptualized as power cycles, in which the useful work output is the work of separation of fresh water from saline water. In this framing, thermodynamic analysis provides powerful tools for raising energy efficiency. This paper discusses the use of entropy generation mi...
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| Format: | Article |
| Language: | en_US |
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American Society of Mechanical Engineers
2019
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| Online Access: | http://hdl.handle.net/1721.1/121018 https://orcid.org/0000-0002-2901-0638 |
| _version_ | 1811089739014471680 |
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| author | Lienhard, John H |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Lienhard, John H |
| author_sort | Lienhard, John H |
| collection | MIT |
| description | Desalination systems can be conceptualized as power cycles, in which the useful work output is the work of separation of fresh water from saline water. In this framing, thermodynamic analysis provides powerful tools for raising energy efficiency. This paper discusses the use of entropy generation minimization for a spectrum of desalination systems, including those based on reverse osmosis, humidification-dehumidification, membrane distillation, electrodialysis, and forward osmosis. The energy efficiency of desalination is shown to be maximized when entropy generation is minimized. Equipartition of entropy generation is considered and applied to these systems. The mechanisms of entropy generation in these systems are characterized, including the identification of major causes of irreversibility. Methods to limit discarded exergy are also identified. Prospects and technology development needs for further improvement are mentioned briefly. |
| first_indexed | 2024-09-23T14:23:56Z |
| format | Article |
| id | mit-1721.1/121018 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:23:56Z |
| publishDate | 2019 |
| publisher | American Society of Mechanical Engineers |
| record_format | dspace |
| spelling | mit-1721.1/1210182024-07-15T17:45:31Z Entropy Generation Minimization for Energy-Efficient Desalination Lienhard, John H Massachusetts Institute of Technology. Department of Mechanical Engineering Rohsenow Kendall Heat Transfer Laboratory (Massachusetts Institute of Technology) Lienhard, John H Desalination systems can be conceptualized as power cycles, in which the useful work output is the work of separation of fresh water from saline water. In this framing, thermodynamic analysis provides powerful tools for raising energy efficiency. This paper discusses the use of entropy generation minimization for a spectrum of desalination systems, including those based on reverse osmosis, humidification-dehumidification, membrane distillation, electrodialysis, and forward osmosis. The energy efficiency of desalination is shown to be maximized when entropy generation is minimized. Equipartition of entropy generation is considered and applied to these systems. The mechanisms of entropy generation in these systems are characterized, including the identification of major causes of irreversibility. Methods to limit discarded exergy are also identified. Prospects and technology development needs for further improvement are mentioned briefly. 2019-03-18T15:52:18Z 2019-03-18T15:52:18Z 2018-11 Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-5208-8 http://hdl.handle.net/1721.1/121018 Lienhard, John H. “Entropy Generation Minimization for Energy-Efficient Desalination.” Volume 6B: Energy (November 9, 2018). https://orcid.org/0000-0002-2901-0638 en_US https://doi.org/10.1115/IMECE2018-88543 Volume 6B: Energy Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Society of Mechanical Engineers Prof. Lienhard |
| spellingShingle | Lienhard, John H Entropy Generation Minimization for Energy-Efficient Desalination |
| title | Entropy Generation Minimization for Energy-Efficient Desalination |
| title_full | Entropy Generation Minimization for Energy-Efficient Desalination |
| title_fullStr | Entropy Generation Minimization for Energy-Efficient Desalination |
| title_full_unstemmed | Entropy Generation Minimization for Energy-Efficient Desalination |
| title_short | Entropy Generation Minimization for Energy-Efficient Desalination |
| title_sort | entropy generation minimization for energy efficient desalination |
| url | http://hdl.handle.net/1721.1/121018 https://orcid.org/0000-0002-2901-0638 |
| work_keys_str_mv | AT lienhardjohnh entropygenerationminimizationforenergyefficientdesalination |