Persona:
Subires Tejedor, Antonio Jesús

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asubires@ind.uned.es
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Subires Tejedor
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Antonio Jesús
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2023 - 20253
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Mostrando 1 - 3 de 3
  • Miniatura
    Publicación
    Thermo-economic assessment of an innovative power cycle for medium-temperature concentrated solar power plants
    (Elsevier, 2025-11-28) Subires Tejedor, Antonio Jesús; Rovira de Antonio, Antonio José; Muñoz Domínguez, Marta; Agencia Estatal de Investigación (España)
    Medium-temperature parabolic-trough concentrated solar power (CSP) plants still rely mainly on superheated steam-Rankine cycles, which limit efficiency improvements and cost reductions. This study proposes and evaluates a propane-based hybrid Rankine–Brayton (HRB) power cycle as an alternative for CSP plants operating below 400 °C and benchmarks it against steam-Rankine, organic Rankine (toluene), supercritical CO2 recompression Brayton and HRB-isobutane cycles. A two-stage assessment is performed. First, a non-standardized parametric analysis identifies efficiency optima under identical heat-source conditions. Second, a standardized comparison fixes the solar field, thermal energy storage (TES), and total design-point heat-exchanger size across the cycles; a genetic algorithm optimizes their distribution among components to maximize net power without relying on component-cost models. Annual simulations are performed using hourly meteorological and electricity-price data for Seville, with revenue-maximizing dispatch. Results show that HRB–propane achieves a similar annual energy yield to the steam-Rankine baseline while delivering 1.3 % higher revenue and reducing power-block costs by 9.8–28.6 %, thereby lowering levelized cost of energy (LCOE) by 1.2–4 %. Compared with ORC–toluene, HRB–propane offers similar profitability with lower pressure ratios and above-atmospheric condensation, reducing air-ingress risk and avoiding working-fluid vent losses associated with vacuum operation. These findings suggest that propane-based HRB cycles can improve the techno-economic performance of CSP plants below 400 °C, supporting their consideration for next-generation solar-thermal systems.
  • Miniatura
    Publicación
    Proposal and Study of a Pumped Thermal Energy Storage to Improve the Economic Results of a Concentrated Solar Power That Works with a Hybrid Rankine–Brayton Propane Cycle
    (MDPI, 2024-04-24) Subires Tejedor, Antonio Jesús; Rovira de Antonio, Antonio José; Muñoz Domínguez, Marta; Agencia Estatal de Investigación (España); Agencia Estatal de Investigación (España)
    This work proposes a pumped thermal energy storage (PTES) integrated into the power block of a concentrated solar power plant. The power block operates under a Hybrid Rankine–Brayton (HRB) cycle using propane as the working fluid. During PTES charging, some thermal energy is obtained from a dedicated compressor (additional to that of the HRB cycle), which is stored. During discharge, both compressors (HRB and PTES) are off, restoring the consumed energy and resulting in about a 13% increase in nominal power output. The system is also able to store thermal energy that would otherwise be rejected through the condenser if the PTES were turned off, leading to efficiency improvements in some cases. Considering the 2022 Spanish electricity market prices, the proposed PTES integration with 4 h of storage is feasible. The levelized cost of storage is calculated and compared to those of other PTES systems, achieving around a 40% reduction compared with an equivalent PTES Rankine. These results encourage future studies where the proposed PTES could be integrated into other power cycles that include a recompression process.
  • Miniatura
    Publicación
    Towards high solar contribution in hybrid CSP-combined cycle gas turbine plants
    (Hindawi, 2023) Ortega, Guillermo; Rovira de Antonio, Antonio José; Barbero Fresno, Rubén; Subires Tejedor, Antonio Jesús; Muñoz Domínguez, Marta
    This paper proposes and analyses several configurations for hybridising concentrating solar power (CSP) plants with combined cycle gas turbines (CCGT). The objective is to increase the solar contribution to a large extent, much higher than those obtained in integrated solar combined cycles but maintaining synergies, which are usually lost when increasing the solar share. For that, two thermal energy management systems are introduced at different temperature levels. First, a configuration with only the low-temperature system is proposed. Then, an enhanced configuration with the low- and high-temperature systems is conceived. These configurations are compared to reference CSP and CCGT state-of-the-art plants. The analyses include different strategies of operation and two sizes for the thermal energy storage system. The results show that the first proposed configuration introduces some synergies but cannot improve the performance of the reference CSP and CCGT working separately, due to an issue with the solar dumping on days with high solar irradiation. The enhanced configuration overcomes this problem and maintains the synergies, leading to an improvement from both the thermodynamic and economic points of view, increasing the solar contribution and decreasing the levelized cost of energy over the reference plants.