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|Título : ||Modeling and simulation of two-phase flow evaporators for parabolic-trough solar thermal power plants.|
|Autor : ||Bonilla Cruz, Javier|
Yebra Muñoz, Luis José
Dormido Bencomo, Sebastián
Zarza Moya, Eduardo
|Palabras clave : ||Centrales solares|
Solar power plants
|Fecha de publicación : ||2013|
|Editorial : ||Editorial CIEMAT|
|Citación : ||Colección Documentos Ciemat;|
|Resumen : ||The main goal of this work was to contribute in modeling horizontal twophase
flow boiling channels (evaporators) for parabolic-trough solar thermal
power plants. The evaporator model is essential for the design of control
schemes. Computational fluid dynamics were applied in order to model and
discretize the evaporator.
Finite volume and moving boundary models were explored in this work.
However, some issues in the dynamic simulation of finite volume models, i.e.
chattering, did not allow for taking full advantage of dynamic simulations.
Furthermore, none of the current moving boundary models considered dynamic
switching between all possible flow configurations in evaporators for
parabolic-trough solar thermal power plants.
The developed evaporator models were obtained from physical principles.
The object-oriented equation-based modeling paradigm, which was considered
for the design of the dynamic evaporator models, contributed to model
maintenance, reusability and decoupling. The equation-based modeling
paradigm increased reusability further, by not fixing the causality and thus
making the models suitable for a wider range of experiments and simulations.
In order to validate the evaporator models, experimental data from a
direct steam generation parabolic-trough solar thermal power plant was used
– the DIrect Solar Steam (DISS) facility owned by Centro de Investigaciones
Energéticas MedioAmbientales y Tecnológicas (CIEMAT)-Plataforma Solar
de Almería (PSA), a Spanish government research and testing center.
This work makes contributions to the field of modeling and simulation of
dynamical systems. A chattering study of finite volume homogeneous twophase
flow dynamic models is presented. The general solutions employed
to solve the chattering problem were analyzed, and particular approaches
were implemented: Mean Densities and the Heuristic approaches, enabling
discretized models to be simulated effectively. New mathematical moving
boundary models were developed in order to support dynamic switching
between all possible flow configurations for evaporators and condensers, and
an equation-based object-oriented library was also implemented to test the
integrity and stability of the moving boundary models.
Approaches to solve chattering in finite volume models and new moving
boundary models were validated against experimental data taken from the
DISS facility. For this purpose, different DISS models were implemented, by
considering finite volume and moving boundary models. Some unknown parameters
were calibrated using a multi-objective genetic algorithm. Finally,
these DISS models were compared against experimental data from the DISS
facility in terms of accuracy and performance. In order to facilitate these
tasks, simulation and calibration frameworks were defined. All the developed DISS models, composed of finite volume and moving
boundary evaporator models, were exposed to a wide range of operating
conditions and disturbances, proving that they can take full advantage of
dynamic simulations and can be used for the design, testing and validation
of advanced control systems.|
|URI : ||http://documenta.ciemat.es/handle/123456789/195|
|ISBN : ||978-84-7834-705-6|
|Aparece en las colecciones: ||Libros de Energía|
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