Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation

Elsayed, Mohamed L.; Mesalhy, Osama; Mohammed, Ramy H.; Chow, Louis C.

doi:10.1016/j.desal.2018.05.021

Title: Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation

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Abstract

This study describes a detailed steady-state analysis and transient operation of a multi-effect desalination plant with a thermal vapor compressor unit (MED-TVC). The model developed is based on solving the basic conservation equations of mass, energy, and salt. It can predict steady-state operation and transient behavior when the plant is subject to abrupt changes in the main input parameters including motive steam flow rate (m_ms), cooling seawater flow rate (m_cw) and cooling seawater temperature (T_cw). These sudden changes simulate the conditions a MED-TVC plant may be exposed to. Both the steady-state and dynamic aspects of the model are validated against published experimental data. Monitoring the variation of four state variables (vapor temperature, brine level, brine and vapor flow rates) in each effect shows that disturbances in the motive steam flow rate and the cooling seawater temperature have a significant effect on the plant performance. On the other hand, the disturbance in the cooling seawater mass flow rate has only a moderate effect. For all applied disturbances, the change in the brine level is the slowest compared to the changes in vapor temperature, and brine and vapor flow rates. Furthermore, the effect of changing seawater salinity shows a slight effect onmore »« less

Authors:

^[1]; Mesalhy, Osama ^[1]; Mohammed, Ramy H. ^[1]; Chow, Louis C. ^[2]

Univ. of Central Florida, Orlando, FL (United States); Zagazig Univ. (Egypt)
Univ. of Central Florida, Orlando, FL (United States)

Publication Date:: Tue Jun 05 00:00:00 EDT 2018

Research Org.:: Savengy Technologies, LLC, Orlando, FL (United States)

Sponsoring Org.:: USDOE Office of Science (SC); Egyptian Ministry of Research and Higher Education

OSTI Identifier:: 1594016

Alternate Identifier(s):: OSTI ID: 1582849

Grant/Contract Number:: SC0015809

Resource Type:: Accepted Manuscript

Journal Name:: Desalination

Additional Journal Information:: Journal Volume: 443; Journal Issue: C; Journal ID: ISSN 0011-9164

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; multiple effect desalination; modeling; dynamic disturbance

Citation Formats


                    Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., and Chow, Louis C. Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation.  United States: N. p., 2018. 
Web.  doi:10.1016/j.desal.2018.05.021.

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                    Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., & Chow, Louis C. Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation.  United States.  https://doi.org/10.1016/j.desal.2018.05.021

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                    Elsayed, Mohamed L., Mesalhy, Osama, Mohammed, Ramy H., and Chow, Louis C. Tue .  
"Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation".  United States.  https://doi.org/10.1016/j.desal.2018.05.021.  https://www.osti.gov/servlets/purl/1594016.

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@article{osti_1594016,

  title        = {Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation},

  author       = {Elsayed, Mohamed L. and Mesalhy, Osama and Mohammed, Ramy H. and Chow, Louis C.},

  abstractNote = {This study describes a detailed steady-state analysis and transient operation of a multi-effect desalination plant with a thermal vapor compressor unit (MED-TVC). The model developed is based on solving the basic conservation equations of mass, energy, and salt. It can predict steady-state operation and transient behavior when the plant is subject to abrupt changes in the main input parameters including motive steam flow rate (mms), cooling seawater flow rate (mcw) and cooling seawater temperature (Tcw). These sudden changes simulate the conditions a MED-TVC plant may be exposed to. Both the steady-state and dynamic aspects of the model are validated against published experimental data. Monitoring the variation of four state variables (vapor temperature, brine level, brine and vapor flow rates) in each effect shows that disturbances in the motive steam flow rate and the cooling seawater temperature have a significant effect on the plant performance. On the other hand, the disturbance in the cooling seawater mass flow rate has only a moderate effect. For all applied disturbances, the change in the brine level is the slowest compared to the changes in vapor temperature, and brine and vapor flow rates. Furthermore, the effect of changing seawater salinity shows a slight effect on the total distillate production and the specific heat transfer area.},

  doi          = {10.1016/j.desal.2018.05.021},

  journal      = {Desalination},

  number       = C,

  volume       = 443,

  place        = {United States},

  year         = {Tue Jun 05 00:00:00 EDT 2018},

  month        = {Tue Jun 05 00:00:00 EDT 2018}

}

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