Browsing by Author "Perez-Garcia, Manuel"

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    Energy and economic performance evaluation of solar thermal and photovoltaic hybrid systems for industrial process heating
    (2025) Rosales Perez, Josue Fihnlay; Villarruel-Jaramillo, Andrés; Perez-Garcia, Manuel; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo
    Hybrid solar heating systems that combine solar thermal (ST) collectors with photovoltaic systems (ST–PV) have shown potential to improve the feasibility of integrating renewable heat in the industrial sector. However, the application scenarios where ST–PV systems achieve better performance relative to individual alternatives and other hybrid configurations have not been determined. This study evaluates the techno-economic performance of ST–PV systems considering the effect of radiation levels, process temperature, and technological proportion of the hybrid field. A sizing methodology for the ST–PV configuration was developed, and a parametric analysis was carried out to identify which implementation scenarios allow better system performance in terms of solar fraction (SF) and levelized cost of heat (LCOH). The results showed that the greatest potential of the ST–PV system is obtained for SFs above 0.3, low and medium process temperatures, and medium and high radiation levels, achieving reductions in the LCOH up to 54% compared to the individual alternatives and showing better economic potential than hybrid systems with two ST collector technologies. The methodology and results of this study provide an important tool for project developers and researchers to determine the implementation conditions where ST–PV systems could improve the viability of industrial solar heating.
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    Energy and economic performance evaluation of solar thermal and photovoltaic hybrid systems for industrial process heating
    (2025) Rosales Perez, Josue Fihnlay; Villarruel-Jaramillo, Andrés; Perez-Garcia, Manuel; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo
    Hybrid solar heating systems that combine solar thermal (ST) collectors with photovoltaic systems (ST–PV) have shown potential to improve the feasibility of integrating renewable heat in the industrial sector. However, the application scenarios where ST–PV systems achieve better performance relative to individual alternatives and other hybrid configurations have not been determined. This study evaluates the techno-economic performance of ST–PV systems considering the effect of radiation levels, process temperature, and technological proportion of the hybrid field. A sizing methodology for the ST–PV configuration was developed, and a parametric analysis was carried out to identify which implementation scenarios allow better system performance in terms of solar fraction (SF) and levelized cost of heat (LCOH). The results showed that the greatest potential of the ST–PV system is obtained for SFs above 0.3, low and medium process temperatures, and medium and high radiation levels, achieving reductions in the LCOH up to 54% compared to the individual alternatives and showing better economic potential than hybrid systems with two ST collector technologies. The methodology and results of this study provide an important tool for project developers and researchers to determine the implementation conditions where ST–PV systems could improve the viability of industrial solar heating.
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    Modeling and Hourly Time-Scale Characterization of the Main Energy Parameters of Parabolic-Trough Solar Thermal Power Plants Using a Simplified Quasi-Dynamic Model
    (2021) Arias, Ignacio; Zarza, Eduardo; Valenzuela, Loreto; Perez-Garcia, Manuel; Romero Ramos, Jose Alfonso; Escobar, Rodrigo
    A simplified mathematical model of parabolic-trough solar thermal power plants, which allow one to carry out an energetic characterization of the main thermal parameters that influence the solar field performance, was evaluated through a comparison of simulation results. Two geographical locations were selected to evaluate the mathematical model proposed in this work-one in each hemisphere-and design considerations according with the practical/operational experience were taken. Furthermore, independent simulations were performed using the System Advisor Model (SAM) software, their results were compared with those obtained by the simplified model. According with the above, the mathematical model allows one to carry out simulations with a high degree of flexibility and adaptability, in which the equations that allow the plant to be energetically characterized are composed of a series of logical conditions that help identify boundary conditions between dawn and sunset, direct normal irradiance transients, and when the thermal energy storage system must compensate the solar field energy deficits to maintain the full load operation of the plant. Due to the above, the developed model allows one to obtain satisfactory simulation results; referring to the net electric power production, this model provides results in both hemispheres with a relative percentage error in the range of [0.28-8.38%] compared with the results obtained with the SAM, with mean square values of 4.57% and 4.21% for sites 1 and 2, respectively.
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    Techno-economic analysis of hybrid solar thermal systems with flat plate and parabolic trough collectors in industrial applications
    (2024) Rosales-Perez, Josue F.; Villarruel-Jaramillo, Andres; Perez-Garcia, Manuel; Cardemil, Jose M.; Escobar, Rodrigo
    Hybrid configurations that combine two different solar thermal collector technologies are considered to improve the economic competitiveness of solar systems in district heating applications. However, the performance of these systems in the industrial sector has been scarcely studied. This study evaluates the energetic and economic potential of hybrid systems with flat plate and parabolic trough collectors under different industrial process temperatures and radiation levels. To enable this evaluation, a hybrid field sizing methodology was developed. The results showed that the hybrid system could achieve high solar fractions with a lower levelized cost of heat than parabolic trough collector individual systems and smaller solar field areas than flat plate collector individual systems. Furthermore, the hybrid system with approximately 50% flat plate collectors reached monthly solar fractions up to 91% higher than the individual flat plate collector alternative. The seasonal performance demonstrates that the hybrid configuration could have great potential for applications with higher demand in the summer months, such as solar cooling with absorption chillers and solar water desalination for crop irrigation. This study contributes to the understanding of the potential of hybrid systems in the industrial sector and presents tools and insights for future research of hybrid solar thermal configurations.