Desarrollo de infraestructuras experimentales y numéricas para el estudio de captadores solares con depósito integrdo (ics)
- Autores: Mauricio de Alba Rosano
- Directores de la Tesis: Jordi Cadafalch Rabasa (dir. tes.), Assensi Oliva Llena (codir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2006
- Idioma: español
- Tribunal Calificador de la Tesis: Valeriano Ruiz Hernández (presid.), Jesús Castro González (secret.), Carlos David Pérez Segarra (voc.), Esteban Codina Macia (voc.)
- Materias:
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- Resumen
he Integrated Collector and Storage systems (ICS) combine solar collection and thermal storage in a single unit, being one of the most simple and cheap type of solar collectors. As in the ICS's the thermal store is directly exposed to the ambient, the heat losses are high. But new technology recently developed, such as the Transparent Insulation Materials (TIM), make possible to improve the ICS's performance at low cost.
This thesis focus on the implementation of a experimental apparatus to test ICS's and in the development of numerical tools to help the design and optimization of ICS's.
Chapter one is an introduction on ICS's. A review of the most relevant experimental and numerical works on ICS's is done, also a review in the materials used in their construction is done. Finally some companies that build or sell materials and ICS's are mentioned.
In chapter two the test protocols used on the ICS's prototypes are explain. There are three test: one day outdoor test, heat losses test and degree of mixing in the storage vessel during draw-off. The experimental set up is also described. The chapter finish presenting some experimental results and its post process.
In chapter three the one dimensional model used for the design of ICS's is described. Different cover configurations and materials can be investigated: multiple glazing, transparent insulation materials, coatings, etc. Once the model has been explained, the two virtual test programmed are shown: one day outdoor test and heat losses test. Finally, as an example, a parametric study over a rectangular ICS with a TIM cover is done, the study evaluates the influence of the storage's depth and the influence of TIM's depth.
Chapter four presents a CFD model for the study of a rectangular water store forming part of an ICS. The governing equations (mass, momentum and energy conservation) are solved assuming bidimensional and laminar flow. Details of the mathematical model and of the numerical model are described. The numerical solutions were verified analyzing the influence of the spatial and temporal discretizations. To validate the model a comparison of the results with experimental data from the literature and with Direct Numerical Simulation (DNS) solutions has been done.
In chapter five the geometry, materials used and a prototype of ICS are described. This prototype was tested under the protocols described in chapter two. The experimental results of the one day outdoor test and heat losses test were compared with the numerical solutions, showing that the numerical tools can be use for the design of ICS's and predict the performance and other interesting data. Therefore, the design, study and optimization of ICS's can be do it not just for the same climatic conditions were the test have been done but any other climatic conditions.
Even when at the final of each chapter particular conclusions have been done, this thesis finish presenting global conclusions of the work as a whole.
