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Rovira de Antonio, Antonio José

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0000-0002-6810-3757
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Rovira de Antonio
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Antonio José
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2014 - 201932020 - 20251
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Autor: Ibarra Mollá, Mercedes × Tiene archivos: true ×

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Mostrando 1 - 4 de 4
  • Miniatura
    Publicación
    Performance of an Organic Rankine Cycle with two expanders at off-design operation
    (Elsevier, 2019-02-19) Ibarra Mollá, Mercedes; Rovira de Antonio, Antonio José; Alarcón-Padilla, Diego-César
    The objective of this work was to simulate the behavior of an Organic Rankine Cycle (ORC) system with two expanders in series at off-design working conditions. The influence of both the intermediate pressure and the volumetric expansion ratio of the expanders on the off-design performance of the ORC was studied and the irreversibilities of the components were analyzed. The performance of the ORC with two expanders for two different designs was also discussed. The thermal efficiency reached using two expanders was higher than the obtained using only one. However, this increase conveyed an increase in the complexity of the design and control of the expanders. As an additional conclusion, it was found that the influence of the intermediate pressure is higher than that of the volume expansion ratio of each expander. The irreversibility of the first expander was mainly due to leaks. However, the performance of the second expander was particularly affected by the difference between the discharged pressure and the condensation pressure. The off-design analysis allowed the definition of a methodology to achieve the desired power with the maximum thermal efficiency, and the identification of the best actuation for the part load operation.
  • Miniatura
    Publicación
    Steady-state analysis of an innovative rotatory Fresnel collector integrated into two industrial processes
    (Elsevier, 2025-04-01) Ibarra Mollá, Mercedes; Barbero Fresno, Rubén; Rovira de Antonio, Antonio José; https://orcid.org/0000-0001-9859-2435; https://orcid.org/0000-0002-6033-1309; https://orcid.org/0000-0002-6810-3757
    This study compares the performance of two solar thermal systems, MAND and AMTP, designed for industrial process heat using a rotating Fresnel collector (Sundial) and Phase Change Material (PCM) thermal energy storage (TES). The systems differ in their latitude and in their demand profiles: MAND, located at low latitude, has a continuous 24-hour demand, while AMTP, located at high latitude, has a daytime-only demand. Through steady-state simulations, both daily and yearly performance were analyzed to assess the impact of these differences on system behavior. The designed system achieved annual energy outputs of 26,34 MWh and 25,37 MWh for the two case studies, over the prescribed target of 25 MWh and capacity factors of 30,34% and 32,11%. Results demonstrate that TES plays distinct roles in each system, with carryover storage being crucial for MAND and maximizing heat exchanger operation being more important for AMTP. The analysis highlights the importance of tailoring system design and control strategies to specific industrial process requirements and demonstrated the feasibility of integrating the ASTEP system for industrial applications, even with not favorable conditions like high latitude and daytime-only demand.
  • Miniatura
    Publicación
    Performance of a 5 kWe solar-only organic Rankine unit coupled to a reverse osmosis plant
    (Elsevier, 2014) Ibarra Mollá, Mercedes; Rovira de Antonio, Antonio José; Alarcón-Padilla, Diego-César; Zaragoza, Guillermo; Blanco Galvez, Julian; https://orcid.org/0000-0002-8843-8511; https://orcid.org/0000-0002-4452-9980; https://orcid.org/0000-0001-7329-380X
    Organic Rankine Cycle (ORC) systems are one of the most promising energy conversion technologies available for remote areas and low temperature energy sources. An ORC system works like a conventional Rankine cycle but it uses an organic compound as working fluid, instead of water. A small ORC unit coupled with a solar thermal energy system could be used to convert solar thermal energy into electricity in remote areas, offering an alternative to Photovoltaic (PV) systems to provide the energy required by desalination applications like reverse osmosis (RO). In this work an analysis of the performance of a specific solar desalination ORC system at part load operation is presented, in order to understand its behavior from a thermodynamic perspective and be able to predict the total water production with changing operation conditions. The results showed that water production is around 1.2 m3/h, and it is stable during day and night thanks to the thermal storage and only under bad irradiance circumstances the production would stop.
  • Miniatura
    Publicación
    Performance of a 5kWe Organic Rankine Cycle at part-load operation
    (Elsevier, 2014-05) Ibarra Mollá, Mercedes; Rovira de Antonio, Antonio José; Alarcón-Padilla, Diego-César; Blanco Galvez, Julian; https://orcid.org/0000-0002-8843-8511; https://orcid.org/0000-0001-7329-380X
    This paper analyzes the performance of an Organic Rankine Cycle (ORC) system at part load operation. The objective is to understand its behavior from a thermodynamic perspective, identifying which elements are the most critical and which are the best operating points for each level of demanded power. This paper also compares two working fluids: R245fa and Solkatherm ES36 (SES36) for the same cycle specifications. The results have shown that the scroll isentropic efficiency has a great influence on the cycle performance and its thermal efficiency and that SES36 arises as a potential better fluid than R245fa. At the given maximum and minimum temperatures, the best operation point was determined. This allows reaching a maximum efficiency for each demanded level of power; depending on the required amount of power, the expander speed and the working pressure are adjusted.