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Research Papers

Modeling of a Solar Seawater Desalination Plant for Automatic Operation Purposes

[+] Author and Article Information
Lidia Roca, Luis J. Yebra, Manuel Berenguel, Diego C. Alarcón-Padilla

 CIEMAT-Plataforma Solar de Almería, P.O. Box 22, 04200 Tabernas, Spain

J. Sol. Energy Eng 130(4), 041009 (Sep 08, 2008) (8 pages) doi:10.1115/1.2969807 History: Received September 22, 2006; Revised February 12, 2008; Published September 08, 2008

Desalination plants play a fundamental role in the fight against fresh water shortage in places with seawater availability. On the other hand, optimization of industrial processes is an important goal in order to increase operation efficiency and to minimize costs. This paper deals with an experimental hybrid solar-gas desalination system designed, built, and operated at the Plataforma Solar de Almería (Spain) under the framework of a European R&D project. This desalination system, based on a multieffect distillation process, is partially powered by a low temperature static solar collector field of a compound parabolic concentrator type. With the aim of performing an optimal operation of the plant working with the solar resource, process dynamics have to be studied and modeled. This paper shows control-oriented low complexity models for the solar field and thermal storage subsystems as well as a model of the distillate production rate depending on process temperature. These models are validated with real data with the objective of being useful in the evaluation of optimal operating points, the design of operational procedures, and the establishment of adequate control references to maximize the use of the solar resource and to improve process efficiency.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Conceptual layout and main subsystems of the AQUASOL plant

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Figure 2

Experimental inputs (June 8, 2007)

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Figure 3

Solar field model (June 8, 2007)

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Figure 4

Storage system model inputs (July 26, 2007)

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Figure 5

Storage system model inputs and state variables (July 26, 2007)

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Figure 6

Fig. 6. MED model inputs (June 25, 2007)

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Figure 7

MED model inputs (June 25, 2007)

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Figure 8

MED model inputs and output (June 25, 2007)

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Figure 9

MED model inputs and output (June 25, 2007)

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