Browsing by Author "Cardemil Iglesias, José Miguel"

Now showing 1 - 20 of 20
  • No Thumbnail Available
    Item
    An in-depth system-level assessment of green hydrogen production by coupling solid oxide electrolysis and solar thermal systems
    (2025) Arias, Ignacio; Castillejo Cuberos, Armando; Battisti, Felipe G.; Romero Ramos, J.A.; Pérez, Manuel; González Portillo, L.F.; Valenzuela, Loreto; Cardemil Iglesias, José Miguel; Escobar, Rodrigo
    This study presents a comprehensive techno-economic analysis of green hydrogen production utilizing a third-generation Concentrated Solar Power system integrated with Solid Oxide Electrolysis Cells, examining system configurations under variable climatic conditions in Chile and Spain. By employing dynamic simulation models that consider hourly and sub-hourly datasets, the research assesses the impact of solar irradiance variability on hydrogen production efficiency. The integration approach explores the efficacy of utilizing high-temperature solar power-derived heat for enhanced electrolysis operation, highlighting the critical influence of solar resource quality and data temporal resolution in system performance. Several scenarios involving different solar multiples, thermal energy storage capacities, and electrolyzer sizes were analyzed to identify their effects on the Levelized Cost of Hydrogen. The economic analysis reveals that this cost is notably sensitive to operational parameters and system configurations, suggesting that optimal integration and scaling of solar power and electrolysis technologies could significantly reduce hydrogen production costs. The findings underscore the need for targeted energy policies and investments in renewable technologies to support cost-effective hydrogen production, promoting future research focusing on advanced materials for electrolysis cells and improved system integration strategies. This work enhances the understanding of integrating advanced solar thermal and electrolysis technologies, providing a robust framework for advancing global sustainable energy solutions.
  • No Thumbnail Available
    Item
    An innovative strategy for improvement of energy efficiency in cement production by means of stratified thermal energy storage integration
    (Elsevier Ltd., 2025) Wolde, Ian; Famiglietti, Antonio; Abbas, Rubén; Cardemil Iglesias, José Miguel
    The cement industry represents a heavy emission source due to its large heat demands in its high-temperature processes, as well as a substantial source of CO2 emissions due to the ongoing chemical reactions. The primary air going into the combustion chambers could be pre-heated using available waste heat from the raw mill. However, batch operation imposes a challenge in supplying a continuous heat flow. Therefore, medium-tohigh-temperature thermal energy storage technologies could be assessed using pinch analysis to design and determine the operating parameters of a heat network with storage, aiming to facilitate the use of waste heat. Using a European cement plant as a reference, an assessment of a heat recovery system with storage is presented based on primary air preheating. The system is assessed considering thermal energy storage technologies that commonly present thermal stratification in order to reduce costs by working with a single storage tank. Air and thermal oil are evaluated as heat transfer fluids, and different filler materials for storage are considered for thermocline thermal energy storage systems. Results show that low-cost media such as copper slags could recover the system’s investment in less than a year, providing savings in the plant heat demand of up to 1.04%.
  • No Thumbnail Available
    Item
    Analysis of copper slag from a Chilean foundry for application as filler material in thermal energy storage systems
    (2025) Segovia Araya, Valentina Constanza; Cardemil Iglesias, José Miguel; Sancy, Mamié; Escobar Moragas, Rodrigo
    In the field of solar thermal storage systems, metallurgical industry by-products have been proposed as filler materials for packed-bed thermal energy storage due to their low cost and suitable thermophysical properties. One of these by-products is copper slag, which has emerged as a competitive option compared to other types of industrial by-products. However, further research of its properties, composition, and heterogeneity is needed to fully address its potential as a storage medium. Approximately 2.2 tons of copper slag is produced per ton of copper extracted, posing disposal challenges for mining companies. Hence, there is growing interest in finding secondary uses for these slags. The present study investigated samples of copper slag from a Chilean foundry disposal site. Elemental and mineral characterization revealed that this heterogeneous material has high iron content with both amorphous and crystalline phases present. The evaluation of thermophysical properties showed stable specific heat capacity that increases with temperature within the range of 100 °C to 450 °C. However, these profiles exhibit variability in heat capacity, particularly at higher temperatures, which decreases with subsequent heating cycles. The results suggest that copper slag has potential as an alternative material for sensible heat storage in packed-bed systems, nonetheless, assessing the variability of its thermophysical properties is crucial to establish its feasibility for sustainable energy solutions.
  • No Thumbnail Available
    Item
    Analyzing regional and local changes in irradiance during the 2019 total solar eclipse in Chile, using field observations and analytical modeling
    (MDPI, 2021) Castillejo Cuberos, Armando; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo
    Solar eclipses are astronomic phenomena in which the Earth’s moon transits between the planet and the Sun, projecting a shadow onto the planet’s surface. As solar power installed capacity increases, detailed studies of this region-wide phenomenon’s effect in irradiance is of interest; how-ever, the literature mainly reports its effects on localized scales. A measurement campaign spanning over 1400 km was pursued for the 2 July 2019 total solar eclipse in Chile, to register the event and establish a modeling framework to assess solar eclipse effects in irradiance over wide regional scales. This work describes the event and presents an estimation framework to decompose atmospheric and eclipse effects on irradiance. An analytical model was applied to study irradiance attenuation throughout the Chilean mainland territory, using satellite-derived and astronomical data as inputs compared to ground measurements in eight stations. Results showed good agreement between model and observations, with Mean Bias Errors of −0.008 to 0.98 W/m2 for Global Horizontal Irradiance and −0.004 to −4.664 W/m2 for Direct Normal Irradiance, with Normalized Root Mean Squared Errors of 0.7–5.8% and 1.4–12.2%, respectively. Energy losses due to obscuration corre-sponded between 20–40% for Global Horizontal Irradiance and 25–50% for Direct Normal Irradi-ance over Chilean territory.
  • No Thumbnail Available
    Item
    Annual performance of a calcium looping thermochemical energy storage with sCO2 Brayton cycle in a solar power tower
    (2025) Nieto Carate, Freddy Mauricio; de la Calle, Alberto; Arias, Ignacio; Cardemil Iglesias, José Miguel; Bayon, Alicia; Escobar, Rodrigo
    This study presents a techno-economic assessment of a novel concentrated solar power plant configuration integrating a calcium-looping thermochemical energy storage system with a supercritical CO2 Brayton cycle. The system enhances dispatchability and efficiency in solar power tower plants through high-temperature thermal storage and flexible operation. The proposed configuration features a polar heliostat field, a central receiver acting as a calciner, and separate storage for CaO and CO2. Dynamic simulations developed in OpenModelica, with Python-based control, evaluate the system under realistic and time-dependent solar profiles. Results demonstrate that replacing molten salt with TCES-CaL enables a more compact solar field, reduces parasitic losses, and improves thermal integration. The optimal configuration, with a solar multiple of 2.6 and 24 hours of storage capacity, achieves a plant efficiency of 39.0% and reduces the levelized cost of energy by 8.5% compared to a molten salt-based reference system. This work highlights the role of storage capacity and concentration factor in maximizing energy yield and economic performance. The integration of TCES-CaL with a sCO2 power cycle shows strong potential for large-scale CSP deployment, providing high efficiency, improved dispatchability, and cost competitiveness. These results contribute to advancing CSP technologies aligned with decarbonization targets and support the integration of thermal energy storage systems at the grid level for future sustainable energy systems.
  • Thumbnail Image
    Item
    Assessing system-level synergies between photovoltaic and proton exchange membrane electrolyzers for solar-powered hydrogen production
    (2024) Arias Olivares, Ignacio Javier; G. Battisti, Felipe; Romero Ramos, J. A.; Pérez, Manuel; Valenzuela, Loreto; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo Alfonso
    This study delves into the techno-economic benefits of integrating Proton Exchange Membrane electrolyzers with photovoltaic systems for hydrogen production, with a keen focus on cost optimization strategies. A comprehensive analysis of several system scales and cost scenarios unveils the critical roles of Proton Exchange Membrane stack systems and the Balance of Plant components in influencing capital expenditures. Notably, the research identifies that incorporating the grid via a complementary Power Purchase Agreement, alongside clipped solar energy, innovatively redistributes cost elements. This approach significantly reduces the levelized cost of hydrogen, thereby enabling the feasibility of hydrogen production in regions characterized by low solar radiation at the cost of high grid electricity penetration. Sensitivity to energy costs, accentuated by different integration schemes, highlights the pivotal role of the stack cost and the Balance of Plant cost reductions in achieving economic viability for large-scale deployments. The study underscores the necessity of holistic cost optimization, revealing that strategic grid support coupled with solar energy enhances the techno-economic performance and broadens the scope for renewable hydrogen production in less favorable locales. These insights offer invaluable guidance to stakeholders, advocating for advanced integration strategies that promise both efficiency and financial sustainability in the burgeoning field of renewable hydrogen production systems.
  • No Thumbnail Available
    Item
    Assessing the integration of solar process heat in the dairy industry: A case study in Chile
    (2024) Fuentes, Francisco; Pailahueque, Nicolás; Muñoz, Iván; Escobar Moragas, Rodrigo Alfonso; Cardemil Iglesias, José Miguel
    Solar heat for industrial processes (SHIP) in the dairy industry has attracted considerable interest during the last few years. The present study assesses the use of solar heat in dairy factories applying Ultra High Temperature pasteurization, using three locations in Chilean central and southern regions as case studies. The analysis utilizes numerical simulations considering annual energy performance, economic feasibility, size of thermal energy storage (TES), and the economic competitiveness for four different solar thermal collector technologies: Flat Plate Collector (FPC), Evacuated Tube Collector, Parabolic Trough Collector (PTC), and Linear Fresnel Reflector. The numerical simulations were conducted using the TRNSYS software for varying meteorological parameters and hourly heat load profile. The integration scheme selected for the implementation of the SHIP systems considers supply level to reheat the boiler's feedwater. The results show that the minimum levelized cost of heat ranges between 78 USD/MWh - 79 USD/MWh, with FPC and PTC showing the lower values. For all the companies analyzed, the minimums values of LCoH were observed when considering specific storage volumes between 75 l/m2-120 l/m2, 2 - 120 l/m 2 , indicating a strong relationship between solar resource availability and financial performance.
  • Thumbnail Image
    Item
    Assessing the performance of novel molten salt mixtures on CSP applications
    (2024) Starke, Allan R.; Cardemil Iglesias, José Miguel; Bonini, Vinicius R.B.; Escobar Moragas, Rodrigo; Castro Quijada, Matías Daniel; Videla Leiva, Álvaro Rodrigo
    The use of molten salt mixtures as a storage medium in Concentrating Solar Power (CSP) plants has been shown to have a significant impact on increasing the reliability of CSP plants and reducing the levelized cost of energy. In this context, the present work presents the implementation of a detailed simulation procedure that contemplates different design considerations for the Rankine cycle to maximize its efficiency according to the temperature constraints established by utilizing different molten salt mixtures. To achieve this, three commercial CSP plant configurations were considered: an indirect coupling using parabolic trough collectors (PTC) with thermal oil as field heat transfer fluid (HTF) and molten salts as the storage medium, a direct coupling of PTC using molten salt as HTF and storage medium, and a central receiver plant (solar tower). The analysis considers the integration strategy between the solar system and the thermal storage, where all of those configurations considered the integration of the two-tank (hot/cold) approach. The analysis enables the development of an accurate estimation of the economic performance of changing the HTF in CSP plants, as well as the assessment of the parasitic consumption due to freezing protection systems, the effect of increasing the current field temperature, and the effect on the plant’s capacity factor. The results show that the improvement in conversion efficiencies associated with salt mixtures operating at higher temperatures induces a higher electricity generation; however, such improvement is not compensated by the material change costs within the specified considerations.
  • Thumbnail Image
    Item
    Assessment of time resolution impact on the modeling of a hybrid CSP-PV : A case of study in Chile
    (2020) Zurita Villamizar, Adriana; Mata Torres, Carlos Enrique; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo
  • Thumbnail Image
    Item
    Compatibility assessment of thermal energy storage integration into industrial heat supply and recovery systems
    (2024) Wolde Ponce, Ian; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo
    Thermal energy storage (TES) systems can be used for recovering industrial waste heat and increasing energy efficiency, especially when coupled to batch thermal processes. Stratified water thermal storage tanks are the preferred technology for low-temperature applications, while molten salts are commonly used in medium and high-temperature applications with large storage capacities. No clear consensus exists on the appropriate TES technology for different industrial demands characteristics and their respective heat supply systems for medium and high-temperature applications. The present study analyzes several industrial sectors and their thermal processes, analyzing their temperature ranges, heat demands, and available TES technologies, which are classified by their operational conditions. The study presents two novel indicators for a preliminar compatibility assessment between TES and industrial sectors: a temperature compatibility indicator and exergy efficiency for TES and thermal processes. The results show that low and medium-temperature applications such as food, chemical, or textile industries exhibit high compatibilities with water (over 64%), high-temperature PCM (over 61%), and solid-state TES (100%), whereas molten salts and chemical looping demonstrate lower compatibility (below 24%). The exergy analysis for industrial cases shows that a lower temperature operating range for a TES induces low exergy efficiency. Regarding this scenario, high-temperature cPCM reaches efficiencies of over 44% for mid and high-temperature processes. Conversely, solid-state TES emerges as the most viable option for integration in high-temperature industries, exhibiting an efficiency of 62% with minimal exergy losses. The indicators defined in this study can be used for an early evaluation of TES integration in industrial applications, thus promoting emerging technologies selection through a quantitative comparison of the compatibility metrics.
  • No Thumbnail Available
    Item
    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.
  • No Thumbnail Available
    Item
    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.
  • Thumbnail Image
    Item
    Enhancing the estimation of direct normal irradiance for six climate zones through machine learning models
    (2024) Rodríguez, Eduardo; López Droguett, Enrique; Cardemil Iglesias, José Miguel; Starke, Allan R.; Cornejo-Ponce, Lorena
    The evaluation of solar radiation is essential for large-scale solar energy systems, as assessing economic feasibility early on depends on accurate solar radiation data. Accurate sensors are needed to characterize the solar resource. Due to a scarcity of solar radiation data, numerical models are commonly used to estimate solar radiation components using meteorological variables that are simple or cheap to measure. In recent years, the use of machine learning (ML) algorithms has gained significant popularity in the estimation of solar radiation components. In this study it is proposed a post-processing approach using the separation model outcomes as input variables to estimate the diffuse fraction. Three ML models are employed (XGBoost, Random Forest, and Multilayer Perceptron) to boost the accuracy in terms of three statistical indicators: nRMSE, nMBE, and . The employed technique takes a distinctive approach by using reference stations to train the machine learning models and, afterward, make the assessment at the site under study. The results show an improvement in terms of precision of individual separation model outcomes. Thus, the proposed methodology may serve as a reliable approach for estimating solar radiation components in cases where historical data for a specific place of interest is not accessible.
  • No Thumbnail Available
    Item
    Improving the off-design modeling of a commercial absorption chiller
    (2025) González, José Manuel; Villa Ochoa, Álvaro Antonio; Cardemil Iglesias, José Miguel; Godoy, Felipe; Zamora Zapata, Mónica
    Modeling a commercial absorption chiller accurately is essential for better integrating and optimizing their operation, especially in off-design conditions. Hence, in this work, a novel model based on the principles of mass and energy conservation was developed, incorporating three improvements for a single-effect LiBr–H2O absorption chiller, corresponding to (i) heat loss to the environment, (ii) heat transfer coefficient dependence on flow rate, and (iii) a falling film evaporator model. As a study case, the improved model was applied to simulate the off-design behavior of the Yazaki WFC-SC10 absorption chiller, using available manufacturer data. The effect of hot and chilled water temperature and hot water flow rate on performance were analyzed. Improvement (i) corrects the design point cooling capacity and heat input predictions to 0.03% and 0.04% error, respectively, far lower than the basic model (3.7% and 8.8%), while adding (ii) proves enough to enhance the off-design performance computation to excellent precision within 40%–100% of the rated hot water flow rate. Lastly, improvement (iii) allows the model to exhibit the performance-degrading partial wetting and overflow operating regimes at the evaporator, maintaining more realistic model predictions in off-design operation. The total model error in capacity and heat input with respect to manufacturer data (MAPE) decreased by 68% and 54% respectively, with respect to the hot water temperature, and by 94% and 82% with respect to its associated flow rate. Overall, this work sets a benchmark in commercial absorption chiller modeling accuracy, and particularly to the atypical behavior of the WFC-SC10.
  • No Thumbnail Available
    Item
    Irradiance separation model parameter estimation from historical cloud cover statistical properties
    (2024) Castillejo Cuberos, Armando; Cardemil Iglesias, José Miguel; Boland, J.; Escobar Moragas, Rodrigo Alfonso
    Irradiance separation models allow the decomposition of Global Horizontal Irradiance into Diffuse Horizontal and Direct Normal Irradiances. These models need fitting to the irradiance characteristics of the location of interest using locally measured ground data. For locations that only measure Global Horizontal Irradiance, current state of the art establishes the use of parameters obtained for another location that measures the three components, with similar climate characteristics. Nevertheless, this results in a lack of localized character for estimates and requires fitting model parameters for all possible climates, which can be infeasible given data availability. This work presents a novel approach based on the hypothesis that the separation model's parameters are a function of the statistical properties of satellite-derived cloud cover estimates. The proposed methodology was evaluated in 23 sites covering all main Koppen-Geiger climatic types and different cloud coverage properties using the Boland-Ridley-Lauret diffuse fraction model. The model performs similarly as locally adjusting the model, with Root Mean Square Errors of 0.087-0.15 diffuse fraction units versus 0.077-0.127 for locally optimized parameters, and offers adequate performance across climates and cloud characteristics. These results encourage future research by generalizing parameter estimation for other diffuse fraction models. The main applications for this research are the estimation of irradiance components where no local data is available for model fitting and the enhancement or complementarity of satellite estimates of surface irradiance. Furthermore, it allows the estimation of missing irradiance components due to equipment failure in locations with insufficient data for a representative, locally adapted model.
  • No Thumbnail Available
    Item
    Modelling the temperature distribution in a horizontal packed-bed thermal energy storage system with copper slag as filler material
    (2025) Calderón Vásquez, Ignacio Andrés; Wolde Ponce Ian; Segovia Araya, Valentina Constanza; Battisti, F. G.; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo Alfonso
    Air-solid packed-bed thermal energy storage (PBTES) systems are potential candidates to reduce implementation costs for renewable energy applications. However, heat transfer modelling requires high computational resources, which makes these models unsuitable for control and management in integrated systems. This work presents a fit parameter estimation model to predict the temperature distribution on an operational PBTES system. Through the non-linear least squares method, we use experimental data to calibrate an analytical solution for the heat exchange within an air-solid porous medium. This model presented a normalised root mean squared error of 4% to predict the temperature and the state of charge (SOC). Using mean values from the mass flow rate time series, the model allows estimating the SOC with a deviation of 0.5% from the one calculated from experimental data, and predicted that approximately 60% of the discharged energy was recovered from the storage tank walls, despite not explicitly modelling them. The proposed model avoids solving differential equations by directly computing the analytical solution, making it computationally efficient. Its accuracy and simplicity make it a strong candidate for integration into control and energy management systems for PBTES technologies.
  • No Thumbnail Available
    Item
    Operational dynamics of packed-bed thermal energy storage: A novel approach to monitor its thermal state
    (2025) Calderón Vásquez, Ignacio Andrés; Battisti, Felipe G.; Escobar Moragas, Rodrigo; Cardemil Iglesias, José Miguel
    Heating solids arranged in a packed bed is a simple method to store sensible thermal energy. This study focuses on cylindrical packed-bed configurations, where a temperature profile develops along the stacked solids and moves towards the system's outlet. Therefore, the availability to store thermal energy in the packed bed decreases over time and the exhaust energy outside the storage increases. To address this challenge, the present work introduces a novel operational metric to monitor the thermal state of packed-bed storage systems. This operational metric relates the stored potential in the system with an ideal stage, and its definition enables constraining the system's operation with a simple mathematical condition, which is a significant outcome from the traditional approach of using arbitrary temperature limits to stop the charging process. Its calculation requires the measurement of the top and bottom temperatures of the packed bed and knowing the system's maximum operating temperatures. When applying the mathematical condition, the required charging time to reach that stage and the cut-off temperature can be obtained. A parametric analysis correlated these operating quantities to design data to predict their value given the design conditions. This work provides a new perspective on the dynamic operation of cylindrical packed-bed sensible thermal energy storage systems, offering a simple yet effective strategy to enhance system performance.
  • No Thumbnail Available
    Item
    Performance and Techno-Economic Comparison Between Solid-Particle and Molten Salt Concentrated Solar Power Systems
    (2025) Arias Olivares, Ignacio Javier; Gesser Battisti, Felipe; Cardemil Iglesias, José Miguel; Castillejo Cuberos, Armando; Escobar Moragas, Rodrigo Alfonso
    This work presents a comprehensive comparative analysis of second-generation (Gen2) and third-generation (Gen3) concentrated solar power (CSP) technologies. The study focuses on their techno-economic performance across three diverse geographical locations: Carrera Pinto, Patache, and Santiago, in Chile. The assessment involves detailed modelling of key subsystems, including the central receiver and power block, considering daily variations and the effects of weather conditions. The results reveal that Gen2 CSP technology can achieve competitive levelized cost of energy (LCOE) values when incorporating projected cost reductions. Notably, Gen3 CSP, using solid particles as the heat transfer medium, exhibits substantial advantages due to its operation at higher temperatures (~800°C). The study also underscores the influence of local climatic conditions on CSP performance. The findings suggest that improved cost projections can render previously less attractive sites, such as Patache and Santiago, viable options for CSP deployment, underscoring the evolving landscape of renewable energy technologies.
  • Thumbnail Image
    Item
    Techno-economic evaluation of hybrid solar thermal and photovoltaic cooling systems in the industrial sector implementing a dynamic load estimation method
    (2025) Villarruel Jaramillo, Andrés Fabricio; Rosales Pérez, Josue Fihnlay; Pérez García, Manuel; Cardemil Iglesias, José Miguel; Escobar, Rodrigo
    Hybrid solar cooling systems (HYBS) that combine air-to-water and absorption chillers driven by photovoltaic and solar thermal collector fields could improve the techno-economic performance of renewable cooling technologies in industrial applications. However, the limited access to dynamic cooling load data is a notable barrier to evaluating these systems. This research evaluates and compares the techno-economic performance of HYBS with conventional solar and fossil-powered alternatives. For this purpose, a dynamic cooling load profile method for the winemaking industry based on the conduction time series and the heat balance methods was developed, which only requires meteorological data and the annual volume of wine production. The HYBS were evaluated considering Chilean wine regions (high, medium and low solar radiation). The results showed that the HYBS could achieve the highest solar fraction values in all evaluated scenarios. Moreover, HYBS reaches a reduction of 7% of the levelized cost of heating and cooling in medium and low solar radiation sceneries, and the economic performance is highly influenced by the local cost of fossil energy. This research contributes to identifying the potential of HYBS in the industry and presents a useful method to generate dynamic cooling loads from commonly available data.
  • No Thumbnail Available
    Item
    Temporal upscaling of solar radiation components using an analytical model for variability modeling
    (2024) Castillejo Cuberos, Armando; Cardemil Iglesias, José Miguel; Escobar Moragas, Rodrigo Alfonso
    To properly design systems that harness the solar resource, reliable measurements or estimates of its availability are needed. Often, this data is only available at temporal resolutions that are not sufficiently fine to capture the short-term fluctuations of the solar resource, creating uncertainty in the design and performance assessment of solar-powered systems. Synthetic irradiance generation techniques aim to create high temporal resolution estimates starting from lower resolution data, however, a literature review on the topic shows opportunities for improvement regarding the generality of the generation and evaluation approaches. This work proposes novel methods to estimate a quantifiable indicator of short-term variability from hourly data, a new temporal upscaling methodology for time series of arbitrary origin and destination temporal resolution, based on explicit mathematical functions and sufficient generality for application in different contexts, and an improved assessment methodology. The method was applied tor ground and satellite upscaling up to 1 min, resulting in time series with characteristics consistent with those of a higher temporal resolution and exhibit minimum deviations against the original time series characteristics. This method has applications not only for upscaling of low temporal resolution data, but also for gap-filling techniques and the upscaling of hourly solar radiation forecasts.