A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification
The humidification-dehumidification (HDH) desalination system can be advantageous in small-scale, off-grid applications. The main drawback of this technology has been its low energy efficiency, which results in high water production costs. Previous studies have approached this issue through thermody...
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| Format: | Article |
| Language: | en_US |
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Begell House Inc.
2015
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| Online Access: | http://hdl.handle.net/1721.1/99725 https://orcid.org/0000-0003-3559-9167 https://orcid.org/0000-0002-2901-0638 |
| _version_ | 1826195790403469312 |
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| author | Cheaib, Farah K. Chehayeb, Karim Malek Lienhard, John H |
| author2 | Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab |
| author_facet | Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab Cheaib, Farah K. Chehayeb, Karim Malek Lienhard, John H |
| author_sort | Cheaib, Farah K. |
| collection | MIT |
| description | The humidification-dehumidification (HDH) desalination system can be advantageous in small-scale, off-grid applications. The main drawback of this technology has been its low energy efficiency, which results in high water production costs. Previous studies have approached this issue through thermodynamic balancing of the system; however, most theoretical work on the balancing of HDH has followed a fixed-effectiveness approach that does not explicitly consider transport processes in the components. Fixing the effectiveness of the heat and mass exchangers allows them to be modeled without explicitly sizing the components and gives insight on how the cycle design can be improved. However, linking the findings of fixed-effectiveness models to actual systems can be challenging, as the performance of the components depends mainly on the available surface areas and the flow rates of the air and water streams. In this study, we present a robust numerical solution algorithm for a heat and mass tranfer model of a complete humidification-dehumidification system consisting of a packed-bed humidifier and a multi-tray bubble column dehumidifier. We look at the effect of varying the water-to-air mass flow rate ratio on the energy efficiency of the system, and we compare the results to those reached following a fixed-effectiveness approach. In addition, we study the effect of the top and bottom temperatures on the performance of the system. We recommended the implementation a control system that varies the mass flow rate ratio in order to keep the system balanced in off-design conditions, especially with varying top temperature. |
| first_indexed | 2024-09-23T10:15:28Z |
| format | Article |
| id | mit-1721.1/99725 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:15:28Z |
| publishDate | 2015 |
| publisher | Begell House Inc. |
| record_format | dspace |
| spelling | mit-1721.1/997252023-02-17T02:05:36Z A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification Cheaib, Farah K. Chehayeb, Karim Malek Lienhard, John H Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab Massachusetts Institute of Technology. Department of Mechanical Engineering Chehayeb, Karim Malek Chehayeb, Karim Malek Lienhard, John H. The humidification-dehumidification (HDH) desalination system can be advantageous in small-scale, off-grid applications. The main drawback of this technology has been its low energy efficiency, which results in high water production costs. Previous studies have approached this issue through thermodynamic balancing of the system; however, most theoretical work on the balancing of HDH has followed a fixed-effectiveness approach that does not explicitly consider transport processes in the components. Fixing the effectiveness of the heat and mass exchangers allows them to be modeled without explicitly sizing the components and gives insight on how the cycle design can be improved. However, linking the findings of fixed-effectiveness models to actual systems can be challenging, as the performance of the components depends mainly on the available surface areas and the flow rates of the air and water streams. In this study, we present a robust numerical solution algorithm for a heat and mass tranfer model of a complete humidification-dehumidification system consisting of a packed-bed humidifier and a multi-tray bubble column dehumidifier. We look at the effect of varying the water-to-air mass flow rate ratio on the energy efficiency of the system, and we compare the results to those reached following a fixed-effectiveness approach. In addition, we study the effect of the top and bottom temperatures on the performance of the system. We recommended the implementation a control system that varies the mass flow rate ratio in order to keep the system balanced in off-design conditions, especially with varying top temperature. Center for Clean Water and Clean Energy at MIT and KFUPM (Project R4-CW-08) 2015-11-05T13:31:43Z 2015-11-05T13:31:43Z 2014-08 Article http://purl.org/eprint/type/ConferencePaper 978-1-56700-421-2 http://hdl.handle.net/1721.1/99725 Chehayeb, Karim, Farah K. Cheaib, and John H. Lienhard. “A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification.” Proceedings of the 15th International Heat Transfer Conference (2014). https://orcid.org/0000-0003-3559-9167 https://orcid.org/0000-0002-2901-0638 en_US http://dx.doi.org/10.1615/IHTC15.eef.008995 Proceedings of the 15th International Heat Transfer Conference Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Begell House Inc. Chehayeb |
| spellingShingle | Cheaib, Farah K. Chehayeb, Karim Malek Lienhard, John H A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title | A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title_full | A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title_fullStr | A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title_full_unstemmed | A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title_short | A Numerical Solution Algorithm for a Heat and Mass Transfer Model of a Desalination System Based on Packed-Bed Humidification and Bubble Column Dehumidification |
| title_sort | numerical solution algorithm for a heat and mass transfer model of a desalination system based on packed bed humidification and bubble column dehumidification |
| url | http://hdl.handle.net/1721.1/99725 https://orcid.org/0000-0003-3559-9167 https://orcid.org/0000-0002-2901-0638 |
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