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Cazorla Marín, AntonioDirectorGonzálvez Maciá, José MaríaDirector

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Fresnel Solar Collector System for Indirect Steam Generation for Industrial Processes with Thermal Energy Storage

Fecha de lectura: 2025-11-28 Centro: Universitat Politècnica de València | ID: 10251/213678

Autor/a: David Hernández, Marco Antonio

Director/a: Gonzálvez Maciá, José María ; Cazorla Marín, Antonio

Resumen

[EN] The industry sector is responsible for a significant amount of annual carbon emissions, largely due to its high energy consumption and reliance on fossil fuels for heat production. It is therefore evident that the utilisation of alternative and renewable heat sources, such as concentrating solar collectors, represents a promising opportunity for the decarbonisation of this sector. Nevertheless, solar collector systems are dependent on the solar resource, which is an intermittent source of energy. It is therefore necessary to have a thermal energy storage (TES) system to facilitate the storage of surplus energy and its subsequent utilisation when required, thereby ensuring a more consistent heat supply. In order to demonstrate the viability of solar thermal systems for industrial applications, the company Solatom CSP installed an experimental solar field within the SOLPINVAP project. It comprises a series of modular linear Fresnel collectors (LFC) and a kettle reboiler, which is a type of shell and tube heat exchanger. This thesis analyses the performance of the system in Indirect Steam Generation mode. In this mode, heat is absorbed inside the absorber tubes by using a heat transfer fluid, and transferred to the shell of the kettle reboiler, where steam is produced. Additionally, this thesis examines the hydraulic circuits and their components of the experimental solar field, as well as the control system and the monitoring system associated with it. Moreover, it is presented the development of a LFC solar heat for industrial process (SHIP) system model. The model was developed within the object-oriented MATLAB environment. A 3D model of the LFC solar field was developed within the Tonatiuh environment (a ray-tracing software), allowing for an estimation of the peak optical efficiency and the corresponding incidence angle modifiers of the Fresnel collectors. . The results demonstrate that the absorbed heat in the collectors exhibits an uncertainty of 12%, while the generated heat exhibits an uncertainty of 3%. In order to reduce the uncertainty inherent in the calculation of the absorbed and generated heat, a study was conducted to selected more precise sensors and monitoring equipment. Moreover, fieldwork was conducted to install the selected, more precise equipment at the SOLPINVAP solar field. The monitoring results demonstrate that the uncertainty in the absorbed heat was reduced by 79% as a consequence of the improvement in the measurement instrumentation. As part of this thesis project, a research stay was conducted at the Departamento de Ingeniería de Mecánica y Metalúrgica of the Pontificia Universidad Católica de Chile, in Santiago. The host research team has been investigating the potential application of solid PBTES with copper slag, a by-product of the pyrometallurgical process of the copper ore, as a storage medium. Moreover, the research team has developed a mathematical model that simulates the thermodynamic and heat transfer process associated with the airflow and solid particles. Accordingly, the PBTES system model has been integrated into the SHIP system model for examination of its effect on the system performance. Furthermore, this thesis examines the dynamics between the temperatures of the different system components. Consequently, this thesis presents a design for an integrated SHIP with PBTES system. Moreover, it was determined that by modifying the air mass flow and the makeup water flow, the system is capable of maintaining a consistent and uninterrupted heat output throughout the operational duration. The results demonstrate that the system with the PBTES is capable of generating 18% more energy than the system without the PBTES. (Summary)

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