The effects of variable operation on RO plant performance
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2012
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| Online Access: | http://hdl.handle.net/1721.1/68958 |
| _version_ | 1826210887489290240 |
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| author | Williams, Christopher Michael, S.M. Massachusetts Institute of Technology |
| author2 | Alexander Mitsos. |
| author_facet | Alexander Mitsos. Williams, Christopher Michael, S.M. Massachusetts Institute of Technology |
| author_sort | Williams, Christopher Michael, S.M. Massachusetts Institute of Technology |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011. |
| first_indexed | 2024-09-23T14:57:02Z |
| format | Thesis |
| id | mit-1721.1/68958 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:57:02Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/689582019-04-11T09:20:38Z The effects of variable operation on RO plant performance Effects of variable operation on reverse osmosis plant performance Williams, Christopher Michael, S.M. Massachusetts Institute of Technology Alexander Mitsos. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011. Cataloged from PDF version of thesis. Includes bibliographical references (p. 113-117). Optimizations of reverse osmosis (RO) plants typically consider steady state operation of the plant. RO plants are subject to transient factors that may make it beneficial to produce more water at one time than at another. These factors can impact the optimal size of the plant. The electricity price is one factor of importance. When long periods of time are considered, other factors such as weather and seasonal water demand can influence the operation and size as well. With long-term operation, water storage is possibile. This thesis investigates the optimal time-varying operation and size of a single stage RO plant subject to a time-varying electricity price. A single stage RO model is modified to include a variable plant size controlled by the number of modules. The annual capital and operating expenses of the plant are calculated in an RO economics sub-model. In one study, the short-term (single day) operation and design are optimized to minimize the total annualized cost of the plant. The operation and size are optimized for four different electricity price functions: constant, moderately fluctuating, highly fluctuating, and actual electricity prices. The results show that significant savings (1-7%) are obtainable and optimal oversizing of 15% is chosen for the fluctuating electricity price functions considered therein. The plant produces more water when electricity is cheap, and shuts off during periods of high electricity price when oversized. The size and day-by-day operation are optimized for one year subject to Spain's electricity price. Little savings and oversizing are obtainable for the day-by-day optimization due to low fluctuations in the electricity price during the year. In a second study, the long-term (one year) operation with storage of product water is optimized to minimize the cumulative cost of reclaiming the water from the reservoir and/or of the electricity. The operation is optimized for electricity prices for California, Cyprus, Greece and Spain for 2010. Low savings are obtained with variable operation. Shutting off is not chosen in the optimal operation and 1% oversizing typically leads to increased costs. Lower electricity prices with more fluctuations result in better savings. Product water is stored during the winter. by Christopher Michael Williams. S.M. 2012-01-30T17:05:58Z 2012-01-30T17:05:58Z 2011 2011 Thesis http://hdl.handle.net/1721.1/68958 773928978 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 117 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Williams, Christopher Michael, S.M. Massachusetts Institute of Technology The effects of variable operation on RO plant performance |
| title | The effects of variable operation on RO plant performance |
| title_full | The effects of variable operation on RO plant performance |
| title_fullStr | The effects of variable operation on RO plant performance |
| title_full_unstemmed | The effects of variable operation on RO plant performance |
| title_short | The effects of variable operation on RO plant performance |
| title_sort | effects of variable operation on ro plant performance |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/68958 |
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