Persona: Montes Pita, María José
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Montes Pita
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Publicación Proposal of a new design of central solar receiver for pressurised gases and supercritical fluids(Elsevier, 2023-07-10) Guedez Mata, Rafael; Linares Hurtado, José Ignacio; González Aguilar, José; Romero, Manuel; Montes Pita, María José; D Souza, David JonathanThis work presents a novel design of microchannel central receiver for pressurised gases and supercritical fluids in solar tower plants. It consists of a radial arrangement of vertical absorber panels that converge on the central axis of the tower. The absorber panels comprise compact structures, whose compactness is increased in one flow pass compared to the previous one, as the fluid is heated. This concept reduces radiation heat losses due to its light-trapping geometry and increases heat transfer to the thermal fluid without over penalising its pressure drop. For the receiver assessment, it has been developed a thermal resistance model characterising the fluid heating along the panel height and the temperature gradient between parallel channel rows of the compact structure across the panel thickness. Once the thermal and optical boundary conditions are defined, an optimisation analysis of the main geometrical parameters of the receiver has been accomplished. The receiver performance is evaluated by means of a global exergy efficiency referred to the solar subsystem, which computes the receiver heat losses, the fluid pressure drop and the optical efficiency of the heliostat field in which the receiver is integrated. For each parametric optimisation, the configuration that maximises this efficiency is identified.Publicación Bibliometric Analysis on Supercritical CO2 Power Cycles for Concentrating Solar Power Applications(MDPI, 2021-09-27) Reyes Belmonte, Miguel Ángel; Guedez Mata, Rafael; Montes Pita, María JoséIn recent years, supercritical CO2 power cycles have received a large amount of interest due to their exceptional theoretical conversion efficiency above 50%, which is leading a revolution in power cycle research. Furthermore; this high efficiency can be achieved at a moderate temperature level; thus suiting concentrating solar power (CSP) applications, which are seen as a core business within supercritical technologies. In this context, numerous studies have been published, creating the need for a thorough analysis to identify research areas of interest and the main researchers in the field. In this work, a bibliometric analysis of supercritical CO2 for CSP applications was undertaken considering all indexed publications within theWeb of Science between 1990 and 2020. The main researchers and areas of interest were identified through network mapping and text mining techniques, thus providing the reader with an unbiased overview of sCO2 research activities. The results of the review were compared with the most recent research projects and programs on sCO2 for CSP applications. It was found that popular research areas in this topic are related to optimization and thermodynamics analysis, which reflects the significance of power cycle configuration and working conditions. Growing interest in medium temperature applications and the design of sCO2 heat exchangers was also identified through density visualization maps and confirmed by a review of research projects.Publicación Advances in solar thermal power plants based on pressurised central receivers and supercritical power cycles(Elsevier, 2023-07-28) Guedez Mata, Rafael; Linares Hurtado, José Ignacio; Reyes Belmonte, Miguel Ángel; Montes Pita, María JoséThis work addresses the comparative thermo-economic study of different configurations of solar thermal power plants, based on supercritical power cycles and pressurised central receiver systems. For all the cases examined, two innovations are introduced in the solar subsystem, compared to other similar studies. Firstly, the heat transfer fluid in the receiver is either a pressurised gas or a supercritical fluid. Secondly, the receiver is composed of compact structures performing as absorber panels, arranged in a radial configuration. The investigation considers different supercritical CO2 recompression cycles of 50 MWe, including a novel proposal of a directly coupled cycle with heat input downstream of the turbine. Furthermore, the study evaluates different heat transfer fluids in the receiver, specifically CO2, N2, and He, concluding that the former is preferred due to its better thermal performance. The main results show that an increase in the receiver inlet pressure yields to a reduction in its size, favouring the thermal efficiency but penalising the optical efficiency of the solar field. Therefore, optimal working pressures may exist for each configuration, depending on the operating temperature. When comparing the optimal configurations, it is observed that the plant based on the intercooling cycle demonstrates the highest overall efficiency, reaching 32.05%. At last, an economic analysis is conducted to assess the viability of the identified optimal configurations. In this regard, the plant based on the partial-cooling cycle exhibits the lowest levelised cost of electricity at 0.15 $/kWh. This is primarily due to its lower investment cost. The innovative directly coupled cycle follows closely with a cost of 0.17 $/kWh, driven by its high electricity production resulting from its low self-consumption.Publicación Towards a general design framework for external tubular solar receivers using pressurised gaseous or supercritical fluids(Elsevier, 2025-12-05) Montes Pita, María José; Linares Hurtado, José Ignacio; Kwan, Pok-Wang; Ireland, Peter; Guedez Mata, Rafael; Comunidad de Madrid (CAM)This work presents a comprehensive analysis of the thermo-fluid parameters governing the design of external tubular solar receivers operating with pressurised gaseous and supercritical fluids. Contrary to the state of the art regarding the use of these fluids in central receivers, this study identifies an optimum threshold operating pressure of 40–50 bar, corresponding to energy efficiencies of approximately 82 %. Beyond this range, efficiency gains become marginal and do not offset the higher investment cost of a high-pressure installation. Although the thermal performance of solar receivers is generally influenced by both pressure loss and total heat loss, the analysis shows that pressure loss has only a limited impact on external tubular receivers, whereas heat losses are the dominant factor. These losses primarily depend on the receiver's cooling effectiveness and external surface area. Cooling effectiveness improves with a higher overall heat transfer coefficient and a lower mean operating temperature. The primary parameters that reduce the external surface area are higher fluid pressure, a greater temperature rise between the receiver inlet and outlet and a larger tube diameter, provided that the maximum temperature remains below the material's allowable limit. This study also demonstrates that the total annualised cost of these pressurised receivers mainly depends on the investment cost, which is proportional to receiver dimensions. Consequently, all parameters that reduce the external surface area also reduce cost. Finally, different working fluids were compared. Among them, CO2 provides superior thermal performance and lower cost, primarily due to its high density at intermediate pressures, which decreases both pumping power requirements and receiver surface area.