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Comparativa del rendimiento teórico máximo y estimado de una planta solar de generación directa de vapor
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Abstract(s)
RESUMEN: En el presente trabajo, se discute el límite teórico máximo de una planta solar de generación directa de vapor bajo la teoría de la termodinámica endorreversible y la termodinámica clásica, comparándolo con el rendimiento estimado en condiciones de operación. La planta solar emplea reflectores Fresnel para la generación directa de vapor con la finalidad de alimentar dos configuraciones de ciclo Rankine, con dos y tres extracciones de vapor respectivamente. Las presiones de las extracciones de vapor se determinaron estipulando una mínima generación de entropía en el ciclo con la finalidad de maximizar el rendimiento térmico. Como resultado de haber optimizado la generación de entropía, la planta analizada presenta un rendimiento térmico muy próximo al de la termodinámica endorreversible, por lo que puede establecerse que los ciclos Rankine discutidos estarán operando prácticamente a la máxima producción de potencia bajo los límites físicos del propio sistema.
ABSTRACT: In the present work, the maximum theoretical limit of a direct steam generation solar plant is discussed under the theory of endoreversible thermodynamics and classical thermodynamics, comparing it with the estimated efficiency in operating conditions. The solar plant uses Fresnel reflectors for direct steam generation in order to feed two Rankine cycle configurations, with two and three steam extractions respectively. The pressures of the steam extractions were determined by stipulating a minimum generation of entropy in the cycle in order to maximize the thermal performance. As a result of optimizing the generation of entropy, the analyzed plant has a thermal efficiency very close to that of endoreversible thermodynamics, so it can be established that the Rankine cycles discussed will be operating at practically the maximum power output under the physical limits of the plant itself system.
ABSTRACT: In the present work, the maximum theoretical limit of a direct steam generation solar plant is discussed under the theory of endoreversible thermodynamics and classical thermodynamics, comparing it with the estimated efficiency in operating conditions. The solar plant uses Fresnel reflectors for direct steam generation in order to feed two Rankine cycle configurations, with two and three steam extractions respectively. The pressures of the steam extractions were determined by stipulating a minimum generation of entropy in the cycle in order to maximize the thermal performance. As a result of optimizing the generation of entropy, the analyzed plant has a thermal efficiency very close to that of endoreversible thermodynamics, so it can be established that the Rankine cycles discussed will be operating at practically the maximum power output under the physical limits of the plant itself system.
Description
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar
Keywords
Solar energy Solar plant Thermal efficiency
Pedagogical Context
Citation
González-Mora, E... [et.al.] - Comparativa del rendimiento teórico máximo y estimado de una planta solar de generación directa de vapor. In: CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 137-144
Publisher
LNEG - Laboratório Nacional de Energia e Geologia