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Dr. Manuel Pérez-García
CIESOL Research Center on Solar Energy, University of Almería

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0 Applied Physics
0 Energy Efficiency
0 Solar Energy
0 solar radiation
0 Reneawable Energy System

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Review
Published: 23 August 2021 in Energies
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A microgrid is a set of decentralized loads and electricity sources, mainly renewable. It can operate connected to and synchronized with a traditional wide-area synchronous grid, i.e., a macrogrid, but can also be disconnected to operate in “island mode” or “isolated mode”. When this microgrid is able to manage its own resources and loads through the use of smart meters, smart appliances, control systems, and the like, it is referred to as a smart grid. Therefore, the management and the distribution of the energy inside the microgrid is an important issue, especially when operating in isolated mode. This work presents an overview of the different solutions that have been tested during the last few years to manage microgrids. The review shows the variety of mature and tested solutions for managing microgrids with different configurations and under several approaches.

ACS Style

Álex Omar Topa Gavilema; José Domingo Álvarez; José Luis Torres Moreno; Manuel Pérez García. Towards Optimal Management in Microgrids: An Overview. Energies 2021, 14, 5202 .

AMA Style

Álex Omar Topa Gavilema, José Domingo Álvarez, José Luis Torres Moreno, Manuel Pérez García. Towards Optimal Management in Microgrids: An Overview. Energies. 2021; 14 (16):5202.

Chicago/Turabian Style

Álex Omar Topa Gavilema; José Domingo Álvarez; José Luis Torres Moreno; Manuel Pérez García. 2021. "Towards Optimal Management in Microgrids: An Overview." Energies 14, no. 16: 5202.

Journal article
Published: 01 July 2021 in DYNA
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Greenhouses in the province of Almeria, one of the largest agro-industrial clusters in the world, have been the subject of various technical and environmental analyses in which, until now, the demand for electricity has not been included in the necessary depth and detail. This circumstance is justified by the fact that productive activity on farms, in its current configuration, cannot be considered as highly energy demanding and, especially, because the impact on the balance sheets of all the industries providing auxiliary services to the greenhouses has not been taken into account. This work first presents a general approach to the energy context of the sector, identifying and assessing some of the basic indicators which determine the relevance of the activity, especially in a regional context. In addition, the need for the study is justified on the basis of demand growth forecasts due to the technification process of the farms currently underway. Next, and based on the availability of an extensive set of data on electricity consumption from eleven nuclei of industrial activity of a diverse nature, but all of which are providers of auxiliary services to intensive agriculture, the main seasonal and daily patterns of this demand have been analysed with the aim of characterising it accurately and, from there, establishing realistic and contrastable reference values when carrying out aggregate studies of the environmental impact and ecological footprint of intensive agriculture in Almería. At the same time, this study has served to advance design criteria that may favour the adoption of photovoltaic systems for the energy supply of this type of company. The consumption of the industries analysed covers a wide range of accumulated demands, between 0.2 GWh/y and 5.41 GWh/y, and has shown strong seasonal and daily dependencies related to the very stages of development of the cultivation processes of the products they serve.

ACS Style

Marina Martínez Molina; Antonio José Vizcaíno Pérez; Manuel Perez Garcia; Francisco Rodriguez Diaz. CHARACTERIZATION OF ELECTRICITY DEMAND IN THE AUXILIARY INDUSTRY OF THE GREENHOUSES AGRICULTURE IN THE PROVINCE OF ALMERIA. DYNA 2021, 96, 359 -363.

AMA Style

Marina Martínez Molina, Antonio José Vizcaíno Pérez, Manuel Perez Garcia, Francisco Rodriguez Diaz. CHARACTERIZATION OF ELECTRICITY DEMAND IN THE AUXILIARY INDUSTRY OF THE GREENHOUSES AGRICULTURE IN THE PROVINCE OF ALMERIA. DYNA. 2021; 96 (4):359-363.

Chicago/Turabian Style

Marina Martínez Molina; Antonio José Vizcaíno Pérez; Manuel Perez Garcia; Francisco Rodriguez Diaz. 2021. "CHARACTERIZATION OF ELECTRICITY DEMAND IN THE AUXILIARY INDUSTRY OF THE GREENHOUSES AGRICULTURE IN THE PROVINCE OF ALMERIA." DYNA 96, no. 4: 359-363.

Journal article
Published: 22 June 2021 in Energies
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The water–energy–food nexus has captured the attention of many researchers and policy makers for the potential synergies between those sectors, including the development of self-sustainable solutions for agriculture systems. This paper poses a novel design approach aimed at balancing the trade-off between the computational burden and accuracy of the results. The method is based on the combination of static energy hub models of the system components and rule-based control to simulate the operational costs over a one-year period as well as a global optimization algorithm that provides, from those results, a design that maximizes the solar energy contribution. The presented real-world case study is based on an isolated greenhouse, whose water needs are met due to a desalination facility, both acting as heat consumers, as well as a solar thermal field and a biomass boiler that cover the demand. Considering the Almerian climate and 1 ha of tomato crops with two growing seasons, the optimal design parameters were determined to be (with a solar fraction of 16% and a biomass fraction of 84%): 266 m2 for the incident area of the solar field, 425 kWh for the thermal storage system, and 4234 kW for the biomass-generated power. The Levelized Cost of Heat (LCOH) values obtained for the solar field and biomass boiler were 0.035 and 0.078 €/kWh, respectively, and the discounted payback period also confirmed the profitability of the plant for fuel prices over 0.05 €/kWh. Thus, the proposed algorithm is useful as an innovative decision-making tool for farmers, for whom the burden of transitioning to sustainable farming systems might increase in the near future.

ACS Style

Juan Gil; Jerónimo Ramos-Teodoro; José Romero-Ramos; Rodrigo Escobar; José Cardemil; Cynthia Giagnocavo; Manuel Pérez. Demand-Side Optimal Sizing of a Solar Energy–Biomass Hybrid System for Isolated Greenhouse Environments: Methodology and Application Example. Energies 2021, 14, 3724 .

AMA Style

Juan Gil, Jerónimo Ramos-Teodoro, José Romero-Ramos, Rodrigo Escobar, José Cardemil, Cynthia Giagnocavo, Manuel Pérez. Demand-Side Optimal Sizing of a Solar Energy–Biomass Hybrid System for Isolated Greenhouse Environments: Methodology and Application Example. Energies. 2021; 14 (13):3724.

Chicago/Turabian Style

Juan Gil; Jerónimo Ramos-Teodoro; José Romero-Ramos; Rodrigo Escobar; José Cardemil; Cynthia Giagnocavo; Manuel Pérez. 2021. "Demand-Side Optimal Sizing of a Solar Energy–Biomass Hybrid System for Isolated Greenhouse Environments: Methodology and Application Example." Energies 14, no. 13: 3724.

Journal article
Published: 04 January 2021 in Energies
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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.

ACS Style

Ignacio Arias Olivares; Eduardo Zarza; Loreto Valenzuela; Manuel Pérez-García; José Alfonso Romero Ramos; Rodrigo Escobar. Modeling and Hourly Time-Scale Characterization of the Main Energy Parameters of Parabolic-Trough Solar Thermal Power Plants Using a Simplified Quasi-Dynamic Model. Energies 2021, 14, 221 .

AMA Style

Ignacio Arias Olivares, Eduardo Zarza, Loreto Valenzuela, Manuel Pérez-García, José Alfonso Romero Ramos, Rodrigo Escobar. Modeling and Hourly Time-Scale Characterization of the Main Energy Parameters of Parabolic-Trough Solar Thermal Power Plants Using a Simplified Quasi-Dynamic Model. Energies. 2021; 14 (1):221.

Chicago/Turabian Style

Ignacio Arias Olivares; Eduardo Zarza; Loreto Valenzuela; Manuel Pérez-García; José Alfonso Romero Ramos; Rodrigo Escobar. 2021. "Modeling and Hourly Time-Scale Characterization of the Main Energy Parameters of Parabolic-Trough Solar Thermal Power Plants Using a Simplified Quasi-Dynamic Model." Energies 14, no. 1: 221.

Journal article
Published: 23 December 2020 in Energies
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This paper reports the analysis of the feasibility to characterise the air leakage and the mechanical ventilation avoiding the intrusiveness of the traditional measurement techniques of the corresponding indicators in buildings. The viability of obtaining the air renovation rate itself from measurements of the concentration of the metabolic CO2, and the possibilities to express this rate as function of other climatic variables, are studied. N2O tracer gas measurements have been taken as reference. A Test Cell and two full size buildings, with and without mechanical ventilation and with different levels of air leakage, are considered as case studies. One-month test campaigns have been used for the reference N2O tracer gas experiments. Longer periods are available for the analysis based on CO2 concentration. When the mechanical ventilation is not active, the results indicate significant correlation between the air renovation rate and the wind speed. The agreement between the N2O reference values and the evolution of the metabolic CO2 is larger for larger initial values of the CO2 concentration. When the mechanical ventilation is active, relevant variations have been observed among the N2O reference values along the test campaigns, without evidencing any correlation with the considered boundary variables.

ACS Style

María José Jiménez; José Alberto Díaz; Antonio Javier Alonso; Sergio Castaño; Manuel Pérez. Non-Intrusive Measurements to Incorporate the Air Renovations in Dynamic Models Assessing the In-Situ Thermal Performance of Buildings. Energies 2020, 14, 37 .

AMA Style

María José Jiménez, José Alberto Díaz, Antonio Javier Alonso, Sergio Castaño, Manuel Pérez. Non-Intrusive Measurements to Incorporate the Air Renovations in Dynamic Models Assessing the In-Situ Thermal Performance of Buildings. Energies. 2020; 14 (1):37.

Chicago/Turabian Style

María José Jiménez; José Alberto Díaz; Antonio Javier Alonso; Sergio Castaño; Manuel Pérez. 2020. "Non-Intrusive Measurements to Incorporate the Air Renovations in Dynamic Models Assessing the In-Situ Thermal Performance of Buildings." Energies 14, no. 1: 37.

Journal article
Published: 06 July 2020 in Energies
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Concentrator photovoltaic (CPV) is used to obtain cheaper and more stable renewable energy. Methods which predict the energy production of a power system under specific circumstances are highly important to reach the goal of using this system as a part of a bigger one or of making it integrated with the grid. In this paper, the development of a model to predict the energy of a High CPV (HCPV) system using an Artificial Neural Network (ANN) is described. This system is located at the University of Rabat. The performed experiments show a quick prediction with encouraging results for a very short-term prediction horizon, considering the small amount of data available. These conclusions are based on the processes of obtaining the ANN models and detailed discussion of the results, which have been validated using real data.

ACS Style

Yaser I. Alamin; Mensah K. Anaty; José Domingo Álvarez Hervás; Khalid Bouziane; Manuel Pérez García; Reda Yaagoubi; María Del Mar Castilla; Merouan Belkasmi; Mohammed Aggour. Very Short-Term Power Forecasting of High Concentrator Photovoltaic Power Facility by Implementing Artificial Neural Network. Energies 2020, 13, 3493 .

AMA Style

Yaser I. Alamin, Mensah K. Anaty, José Domingo Álvarez Hervás, Khalid Bouziane, Manuel Pérez García, Reda Yaagoubi, María Del Mar Castilla, Merouan Belkasmi, Mohammed Aggour. Very Short-Term Power Forecasting of High Concentrator Photovoltaic Power Facility by Implementing Artificial Neural Network. Energies. 2020; 13 (13):3493.

Chicago/Turabian Style

Yaser I. Alamin; Mensah K. Anaty; José Domingo Álvarez Hervás; Khalid Bouziane; Manuel Pérez García; Reda Yaagoubi; María Del Mar Castilla; Merouan Belkasmi; Mohammed Aggour. 2020. "Very Short-Term Power Forecasting of High Concentrator Photovoltaic Power Facility by Implementing Artificial Neural Network." Energies 13, no. 13: 3493.

Journal article
Published: 19 August 2018 in Energies
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In this work, we focus on optimal energy management within the context of the tertiary control of a microgrid operating in grid-connected mode. Specifically, the optimal energy management problem is solved in a unified way by using the optimal power flow (OPF) and day-ahead concepts. The elements considered in the microgrid are a photovoltaic panel, a wind turbine, electric vehicles, a storage system, and a point of common coupling with the main grid. The aim of this paper consists of optimizing the economic energy dispatch within the microgrid considering known predictions of electricity demand, solar radiation, and wind speed for a given period of time. The OPF is solved using three different algorithms provided by the optimization toolbox of MATLAB® (R2015a, MathWorks®, Natick, MA, USA): the interior point method (IP), a hybrid genetic algorithm with interior point (GA-IP), and a hybrid direct search with interior point (patternsearch-IP). The efficiency and effectiveness of the algorithms to optimize the energy dispatch within the microgrid are verified and analyzed through a case study, where real climatological data of solar irradiance, wind speed in Almería city, photovoltaic system data, and room load from a bioclimatic building were considered.

ACS Style

Luis Orlando Polanco Vasquez; Cristian Andrés Carreño Meneses; Alejandro Pizano Martínez; Juana López Redondo; Manuel Pérez García; José Domingo Álvarez Hervás. Optimal Energy Management within a Microgrid: A Comparative Study. Energies 2018, 11, 2167 .

AMA Style

Luis Orlando Polanco Vasquez, Cristian Andrés Carreño Meneses, Alejandro Pizano Martínez, Juana López Redondo, Manuel Pérez García, José Domingo Álvarez Hervás. Optimal Energy Management within a Microgrid: A Comparative Study. Energies. 2018; 11 (8):2167.

Chicago/Turabian Style

Luis Orlando Polanco Vasquez; Cristian Andrés Carreño Meneses; Alejandro Pizano Martínez; Juana López Redondo; Manuel Pérez García; José Domingo Álvarez Hervás. 2018. "Optimal Energy Management within a Microgrid: A Comparative Study." Energies 11, no. 8: 2167.

Journal article
Published: 01 August 2018 in Solar Energy
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ACS Style

Gary Ampuño; Lidia Roca; Manuel Berenguel; Juan D. Gil; Manuel Pérez-García; Julio Elias Normey-Rico. Modeling and simulation of a solar field based on flat-plate collectors. Solar Energy 2018, 170, 369 -378.

AMA Style

Gary Ampuño, Lidia Roca, Manuel Berenguel, Juan D. Gil, Manuel Pérez-García, Julio Elias Normey-Rico. Modeling and simulation of a solar field based on flat-plate collectors. Solar Energy. 2018; 170 ():369-378.

Chicago/Turabian Style

Gary Ampuño; Lidia Roca; Manuel Berenguel; Juan D. Gil; Manuel Pérez-García; Julio Elias Normey-Rico. 2018. "Modeling and simulation of a solar field based on flat-plate collectors." Solar Energy 170, no. : 369-378.

Journal article
Published: 30 March 2018 in Energy
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This work presents the development of a solar thermal test loop to assess the performance of small-sized parabolic-trough collectors (PTC) under real outdoor conditions, as well as the results of a set of experiments aimed at comparing the testing conditions specified in the existing standards for solar thermal collectors (EN 12975-2:2006, ASTM E905-87:2013, SRCC 600 2014-17:2015 and ISO 9806:2017). The aim is to contribute to establishing the correct certification scheme for this specific type of collectors, which owing to their suitability for covering the thermal energy demand in the temperature range between 100 and 250 °C (mainly in the field of solar heat in industrial processes) are currently experiencing significant development both in terms of commercial options and operating projects. In general, an absence of consensus among the standards was detected. According to the results obtained in the specifically designed test loop, some alterations to the existing standards are issued: for example the correct sampling rate should be 5 s, the uncertainty required for the temperature difference is too restrictive, the maximum wind velocity imposed is difficult to fulfill, and variations permitted to solar irradiance and ambient temperature could be more constrictive.

ACS Style

Aránzazu Fernández-García; Loreto Valenzuela; Eduardo Zarza; Esther Rojas; Manuel Pérez; Quetzalcoatl Hernández-Escobedo; Francisco Manzano-Agugliaro. SMALL-SIZED parabolic-trough solar collectors: Development of a test loop and evaluation of testing conditions. Energy 2018, 152, 401 -415.

AMA Style

Aránzazu Fernández-García, Loreto Valenzuela, Eduardo Zarza, Esther Rojas, Manuel Pérez, Quetzalcoatl Hernández-Escobedo, Francisco Manzano-Agugliaro. SMALL-SIZED parabolic-trough solar collectors: Development of a test loop and evaluation of testing conditions. Energy. 2018; 152 ():401-415.

Chicago/Turabian Style

Aránzazu Fernández-García; Loreto Valenzuela; Eduardo Zarza; Esther Rojas; Manuel Pérez; Quetzalcoatl Hernández-Escobedo; Francisco Manzano-Agugliaro. 2018. "SMALL-SIZED parabolic-trough solar collectors: Development of a test loop and evaluation of testing conditions." Energy 152, no. : 401-415.

Journal article
Published: 28 February 2018 in Energies
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This paper analyzes the impact of photovoltaic (PV) systems on storage and electric vehicles in micro-grids. As these kinds of systems are becoming increasingly popular in the residential sector, the development of a new generation of equipment, such as more efficient batteries or solar panels, makes further study necessary. These systems are especially interesting in commercial or office buildings, since they have a more repetitive daily pattern of electricity consumption, which usually occurs within the maximum solar radiation hours. Based on this need, a novel control strategy aimed at efficiently managing this kind of micro-grid is proposed. The core of this strategy is a rule-based controller managing the power flows between the grid and the batteries of both the PV system and the electric vehicle. Through experimental data and simulations, this strategy was tested under different scenarios. The selected testbed consisted of the laboratory of a research center, which could be easily scalable to the entire building. Results showed the benefits of using an electric vehicle as an active agent in energy balance, leading to a reduction of the energetic costs of a micro-grid.

ACS Style

Jose Luis Torres-Moreno; Antonio Giménez-Fernández; Manuel Pérez-García; Francisco Rodriguez. Energy Management Strategy for Micro-Grids with PV-Battery Systems and Electric Vehicles. Energies 2018, 11, 522 .

AMA Style

Jose Luis Torres-Moreno, Antonio Giménez-Fernández, Manuel Pérez-García, Francisco Rodriguez. Energy Management Strategy for Micro-Grids with PV-Battery Systems and Electric Vehicles. Energies. 2018; 11 (3):522.

Chicago/Turabian Style

Jose Luis Torres-Moreno; Antonio Giménez-Fernández; Manuel Pérez-García; Francisco Rodriguez. 2018. "Energy Management Strategy for Micro-Grids with PV-Battery Systems and Electric Vehicles." Energies 11, no. 3: 522.

Journal article
Published: 01 May 2016 in Applied Thermal Engineering
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• Definition of tests with molten salts to validate components in real operation. • Description of the experimental devices for testing components with molten salt. • Validation of the proposed tests for components with molten salt. • Starting point for standard procedures for validating equipment for sensible storage. Thermal energy storage has been identified as an effective method for improving the capacity of concentrating solar power plants. The most commonly-used storage media is molten salt (also known as solar salt) comprising 60 % w NaNO3 – 40 % w KNO3. However, their specific features such as material incompatibilities, high surface tension and a high solidification point (which is around 240 °C) can create technical issues and systematic failures in hydraulic components and instruments where the molten salt flows. The current standard procedures for testing hydraulic components, such as valves and pressure transmitters, do not take into account their real behavior under the working conditions and type of fluid used in these commercial thermal storage systems. This study reports the results of a specific set of tests for commercial globe valves and pressure transmitters operated at high temperature in molten salt thermal energy storage systems in CSP facilities. These tests were performed using two experimental devices, BES-I and BES-II, designed specifically for the task and constructed at the Plataforma Solar de Almeria (PSA), which belongs to the Spanish Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT). While BES-I can test components up to 3 MPa and 400 °C, BES-II can extend the working conditions up to 4 MPa and 600 °C. To support the proposed tests, some experimental results for a globe valve and a pressure transmitter are presented and discussed. The tests are conducive to improving component design and allowing manufacturers to adapt their products for operation in molten salt thermal energy storage systems.

ACS Style

Margarita Manuela Rodriguez-Garcia; Esther Rojas; Manuel Pérez-García. Procedures for testing valves and pressure transducers with molten salt. Applied Thermal Engineering 2016, 101, 139 -146.

AMA Style

Margarita Manuela Rodriguez-Garcia, Esther Rojas, Manuel Pérez-García. Procedures for testing valves and pressure transducers with molten salt. Applied Thermal Engineering. 2016; 101 ():139-146.

Chicago/Turabian Style

Margarita Manuela Rodriguez-Garcia; Esther Rojas; Manuel Pérez-García. 2016. "Procedures for testing valves and pressure transducers with molten salt." Applied Thermal Engineering 101, no. : 139-146.

Journal article
Published: 01 February 2015 in Journal of Cleaner Production
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ACS Style

Aránzazu Fernández-García; Esther Rojas; Manuel Pérez-García; Ricardo Silva; Quetzalcoatl Hernandez-Escobedo; Francisco Manzano-Agugliaro. A parabolic-trough collector for cleaner industrial process heat. Journal of Cleaner Production 2015, 89, 272 -285.

AMA Style

Aránzazu Fernández-García, Esther Rojas, Manuel Pérez-García, Ricardo Silva, Quetzalcoatl Hernandez-Escobedo, Francisco Manzano-Agugliaro. A parabolic-trough collector for cleaner industrial process heat. Journal of Cleaner Production. 2015; 89 ():272-285.

Chicago/Turabian Style

Aránzazu Fernández-García; Esther Rojas; Manuel Pérez-García; Ricardo Silva; Quetzalcoatl Hernandez-Escobedo; Francisco Manzano-Agugliaro. 2015. "A parabolic-trough collector for cleaner industrial process heat." Journal of Cleaner Production 89, no. : 272-285.

Journal article
Published: 03 March 2014 in Applied Energy
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A non-deterministic uncertainty and global sensitivity analysis, based on the Sobol’s method, is developed for a parabolic-trough direct steam generation plant for process heat applications. The objective of this work is to evaluate the robustness of the simulation-based design stage, identifying major modelling sources of uncertainty, as well as quantifying and ranking the relevance of its contribution to the system performance output uncertainty. An important finding obtained from the case considered in this work is that, although the complex characteristics of the direct steam generation two-phase regime introduces additional sources of uncertainty into the low-level modelling stage, the propagation and impact of this uncertainty to system level energy and economic-based design indicators is largely mitigated by higher-level input factors uncertainty. The economic design indicator uncertainty and global sensitivity analysis shows that the lowest relative output uncertainty is obtained by the levelized cost of energy with a coefficient of variation of 4.3%; followed by payback time with 12.1%. The largest contributors of input factors uncertainty to the levelized cost of energy uncertainty are the market discount rate and boiler efficiency, showing total sensitivity indices of 0.67 and 0.23, respectively.

ACS Style

R. Silva; Manuel Pérez-García; Manuel Berenguel; L. Valenzuela; Eduardo Zarza. Uncertainty and global sensitivity analysis in the design of parabolic-trough direct steam generation plants for process heat applications. Applied Energy 2014, 121, 233 -244.

AMA Style

R. Silva, Manuel Pérez-García, Manuel Berenguel, L. Valenzuela, Eduardo Zarza. Uncertainty and global sensitivity analysis in the design of parabolic-trough direct steam generation plants for process heat applications. Applied Energy. 2014; 121 ():233-244.

Chicago/Turabian Style

R. Silva; Manuel Pérez-García; Manuel Berenguel; L. Valenzuela; Eduardo Zarza. 2014. "Uncertainty and global sensitivity analysis in the design of parabolic-trough direct steam generation plants for process heat applications." Applied Energy 121, no. : 233-244.

Journal article
Published: 01 January 2014 in Energy Procedia
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In the present work the use of a parabolic trough solar plant to generate process heat steam for a food processing application is studied. The food processing industry, devoted to vegetables preservation by thermal treatment and canning, is located in the Southern Spain region and demands saturated steam at 7bar with an total annual consumption of 148MWh. The base solar plant configuration analyzed consists on a parabolic trough solar field, thermally stratified energy storage, and a steam generator (unfired boiler). The influence of the main operational variables of the solar plant are studied, namely the solar field outlet temperature and the steam generator return temperature to assess its influence in the main energy based design indicators of the plant. Furthermore the possibility of including a pre-heating heat exchanger before the steam generator is also evaluated. The obtained results of this study show the suitability of changing the present energy input scheme of this industry

ACS Style

Ricardo Silva; Francisco Javier Cabrera; Manuel Pérez-García. Process Heat Generation with Parabolic Trough Collectors for a Vegetables Preservation Industry in Southern Spain. Energy Procedia 2014, 48, 1210 -1216.

AMA Style

Ricardo Silva, Francisco Javier Cabrera, Manuel Pérez-García. Process Heat Generation with Parabolic Trough Collectors for a Vegetables Preservation Industry in Southern Spain. Energy Procedia. 2014; 48 ():1210-1216.

Chicago/Turabian Style

Ricardo Silva; Francisco Javier Cabrera; Manuel Pérez-García. 2014. "Process Heat Generation with Parabolic Trough Collectors for a Vegetables Preservation Industry in Southern Spain." Energy Procedia 48, no. : 1210-1216.

Journal article
Published: 30 August 2013 in Applied Energy
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A thermo-economic design optimization of a parabolic trough solar plant for industrial processes with memetic algorithms is developed. The design domain variables considered in the optimization routine are the number of collectors in series, number of collector rows, row spacing, and storage volume. Life cycle savings, levelized cost of energy, and payback time objective functions are compared to study the influence on optimal design point location. Furthermore a multi-objective optimization approach is proposed to analyze the design problem from a multi-economic criteria point of view. An extensive set of optimization cases are performed to estimate the influence of fuel price trend, plant location, demand profile, operation conditions, solar field orientation, and radiation uncertainty on optimal design. The results allow quantifying as thermo-economic design optimization based on short term criteria as the payback time leads to smaller plants with higher solar field efficiencies and smaller solar fractions, while the consideration of optimization criteria based on long term performance of the plants, as life cycle savings based optimization, leads to the reverse conclusion. The role of plant location and future evolution of gas prices in the thermo-economic performance of the solar plant has been also analyzed. Thermo-economic optimization of a parabolic trough solar plant design for the reference industrial process heat application at a southern Mediterranean country considered in this work shows a levelized cost of energy of 5 c€/kW h.

ACS Style

R. Silva; Manuel Berenguel; Manuel Pérez-García; Aránzazu Fernández-García. Thermo-economic design optimization of parabolic trough solar plants for industrial process heat applications with memetic algorithms. Applied Energy 2013, 113, 603 -614.

AMA Style

R. Silva, Manuel Berenguel, Manuel Pérez-García, Aránzazu Fernández-García. Thermo-economic design optimization of parabolic trough solar plants for industrial process heat applications with memetic algorithms. Applied Energy. 2013; 113 ():603-614.

Chicago/Turabian Style

R. Silva; Manuel Berenguel; Manuel Pérez-García; Aránzazu Fernández-García. 2013. "Thermo-economic design optimization of parabolic trough solar plants for industrial process heat applications with memetic algorithms." Applied Energy 113, no. : 603-614.

Journal article
Published: 01 April 2013 in Renewable and Sustainable Energy Reviews
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ACS Style

F.J. Cabrera; Aránzazu Fernández-García; R.M.P. Silva; Manuel Pérez-García. Use of parabolic trough solar collectors for solar refrigeration and air-conditioning applications. Renewable and Sustainable Energy Reviews 2013, 20, 103 -118.

AMA Style

F.J. Cabrera, Aránzazu Fernández-García, R.M.P. Silva, Manuel Pérez-García. Use of parabolic trough solar collectors for solar refrigeration and air-conditioning applications. Renewable and Sustainable Energy Reviews. 2013; 20 ():103-118.

Chicago/Turabian Style

F.J. Cabrera; Aránzazu Fernández-García; R.M.P. Silva; Manuel Pérez-García. 2013. "Use of parabolic trough solar collectors for solar refrigeration and air-conditioning applications." Renewable and Sustainable Energy Reviews 20, no. : 103-118.

Journal article
Published: 27 February 2013 in Applied Energy
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In the present paper a tri-dimensional non-linear dynamic thermohydraulic model of a parabolic trough collector was developed in the high-level acausal object-oriented language Modelica and coupled to a solar industrial process heat plant modeled in TRNSYS. The integration is performed in an innovative co-simulation environment based on the TLK interconnect software connector middleware. A discrete Monte Carlo ray-tracing model was developed in SolTrace to compute the solar radiation heterogeneous local concentration ratio in the parabolic trough collector absorber outer surface. The obtained results show that the efficiency predicted by the model agrees well with experimental data with a root mean square error of 1.2%. The dynamic performance was validated with experimental data from the Acurex solar field, located at the Plataforma Solar de Almeria, South-East Spain, and presents a good agreement. An optimization of the IST collector mass flow rate was performed based on the minimization of an energy loss cost function showing an optimal mass flow rate of 0.22 kg/s m2. A parametric analysis showed the influence on collector efficiency of several design properties, such as the absorber emittance and absorptance. Different parabolic trough solar field model structures were compared showing that, from a thermal point of view, the one-dimensional model performs close to the bi-dimensional. Co-simulations conducted on a reference industrial process heat scenario on a South European climate show an annual solar fraction of 67% for a solar plant consisting on a solar field of 1000 m2, with thermal energy storage, coupled to a continuous industrial thermal demand of 100 kW.

ACS Style

R. Silva; Manuel Pérez-García; Aránzazu Fernández-García. Modeling and co-simulation of a parabolic trough solar plant for industrial process heat. Applied Energy 2013, 106, 287 -300.

AMA Style

R. Silva, Manuel Pérez-García, Aránzazu Fernández-García. Modeling and co-simulation of a parabolic trough solar plant for industrial process heat. Applied Energy. 2013; 106 ():287-300.

Chicago/Turabian Style

R. Silva; Manuel Pérez-García; Aránzazu Fernández-García. 2013. "Modeling and co-simulation of a parabolic trough solar plant for industrial process heat." Applied Energy 106, no. : 287-300.

Journal article
Published: 01 September 2012 in Renewable and Sustainable Energy Reviews
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ACS Style

José Pérez-Alonso; Manuel Pérez-García; M. Pasamontes-Romera; A.J. Callejón-Ferre. Performance analysis and neural modelling of a greenhouse integrated photovoltaic system. Renewable and Sustainable Energy Reviews 2012, 16, 4675 -4685.

AMA Style

José Pérez-Alonso, Manuel Pérez-García, M. Pasamontes-Romera, A.J. Callejón-Ferre. Performance analysis and neural modelling of a greenhouse integrated photovoltaic system. Renewable and Sustainable Energy Reviews. 2012; 16 (7):4675-4685.

Chicago/Turabian Style

José Pérez-Alonso; Manuel Pérez-García; M. Pasamontes-Romera; A.J. Callejón-Ferre. 2012. "Performance analysis and neural modelling of a greenhouse integrated photovoltaic system." Renewable and Sustainable Energy Reviews 16, no. 7: 4675-4685.

Journal article
Published: 31 October 2011 in Energy and Buildings
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Most of the time, people perform their daily activities inside buildings. Thus, an important factor is to look for a tradeoff between energy saving and user welfare, since lack of poor indoor comfort has a direct effect on users’ productivity and an indirect effect on energy efficiency. The use of appropriate control strategies can highly contribute to this purpose. This paper presents a comparison among several predictive control approaches, that allow to obtain a high thermal comfort level optimizing the use of an HVAC (Heating, Ventilation and Air Conditioning) system by means of different cost functions. Real results obtained in a solar energy research centre are included and commented.

ACS Style

M. Castilla; J.D. Álvarez; M. Berenguel; F. Rodríguez; J.L. Guzmán; M. Pérez. A comparison of thermal comfort predictive control strategies. Energy and Buildings 2011, 43, 2737 -2746.

AMA Style

M. Castilla, J.D. Álvarez, M. Berenguel, F. Rodríguez, J.L. Guzmán, M. Pérez. A comparison of thermal comfort predictive control strategies. Energy and Buildings. 2011; 43 (10):2737-2746.

Chicago/Turabian Style

M. Castilla; J.D. Álvarez; M. Berenguel; F. Rodríguez; J.L. Guzmán; M. Pérez. 2011. "A comparison of thermal comfort predictive control strategies." Energy and Buildings 43, no. 10: 2737-2746.

Review article
Published: 30 September 2010 in Renewable and Sustainable Energy Reviews
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This paper presents an overview of the parabolic-trough collectors that have been built and marketed during the past century, as well as the prototypes currently under development. It also presents a survey of systems which could incorporate this type of concentrating solar system to supply thermal energy up to 400 °C, especially steam power cycles for electricity generation, including examples of each application.

ACS Style

A. Fernández-García; Eduardo Zarza; Loreto Valenzuela; Manuel Pérez-García. Parabolic-trough solar collectors and their applications. Renewable and Sustainable Energy Reviews 2010, 14, 1695 -1721.

AMA Style

A. Fernández-García, Eduardo Zarza, Loreto Valenzuela, Manuel Pérez-García. Parabolic-trough solar collectors and their applications. Renewable and Sustainable Energy Reviews. 2010; 14 (7):1695-1721.

Chicago/Turabian Style

A. Fernández-García; Eduardo Zarza; Loreto Valenzuela; Manuel Pérez-García. 2010. "Parabolic-trough solar collectors and their applications." Renewable and Sustainable Energy Reviews 14, no. 7: 1695-1721.