Manuel Pérez García

• PhD
• Lecturer at University of Almería

Following publication, the Editorial Office became aware that the original article [...]

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...

Small-sized parabolic trough collectors are a promising solution for renewable heat supply, meeting the industrial demand for thermal energy up to 250°. In this manuscript, a novel, to our knowledge, optical design hybridizing parabolic trough concentrators with photovoltaic generators is introduced, incorporating actionable photovoltaic slats in t...

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...

Este trabajo presenta los resultados de la evaluación térmica de un captador cilindroparabólico de pequeño tamaño, compuesto por un espejo reflector y un tubo metálico. Estos captadores tienen un gran potencial en la generación de energía térmica para satisfacer demandas industriales a temperaturas de hasta 250◦C. Para ello se desarrolló un modelo...

Sustainable greenhouses have gained relevance in recent years due to their potential to reduce the carbon footprint of the agricultural sector by being integrated with renewable systems, contributing to the decarbonization of energy. Although solar technologies tend to be more accessible to cover the system’s energy demands, greenhouses are subject...

Process heating is the activity with the most energy consumption in the industrial sector. Solar heating (SH) systems are a promising alternative to provide renewable thermal energy to industrial processes. However, factors such as high investment costs and area limitations in industrial facilities hinder their utilization; therefore, hybrid system...

n this work, the potential of southeastern Spain to host solar thermal plants to meet the heat demands of its industrial enclaves is assessed and presented. For this, the generation of thermal energy for industrial uses in the medium temperature range is estimated, with special emphasis on those areas not connected to the thermal energy distributio...

This work presents the modeling and energy management of a microgrid through models developed based on physical equations for its optimal control. The microgrid's energy management system was built with one of the most popular control algorithms in microgrid energy management systems: model predictive control. This control strategy aims to satisfy...

The use of solar thermal systems to produce heat for industrial processes is a feasible option that is gaining increasing interest in recent years as an initiative toward the zero-carbon energy future. This technology has a place in different processes, yet there is still no consensus on the main methods for sizing or controlling. The design requir...

The current efforts to implement renewable sources for community-driven solutions for energy supply in traditional population settlements having limited access to energy distribution networks are mainly based on systems devoted to fulfilling the electricity demands. However, in addition to the above, many productive activities located at those sett...

The treatment of high salinity feeds, for example, brines from other desalination technologies such as reverse osmosis, is becoming one of the sought-after applications of solar membrane distillation processes. One of the most appropriate operating methodologies to carry out these treatments is a batch operation. Nevertheless, throughout this opera...

The trend to reduce CO2 emissions in cooling processes has made it possible to increase the alternatives for integrating solar energy with thermal equipment whose viability depends on its adaptation to polygeneration schemes. Despite the enormous potential offered by the industry for cooling and heating processes, solar cooling technologies (SCT) h...

Determining the static overall efficiency of inverters is sometimes necessary for control o design purposes. As getting this information from the manufacturers’ datasheets or certified laboratories might not be always viable, this paper addresses its estimation from direct measurements under actual operating conditions. Particularly, the Sandia Inv...

This study presents a techno-economic assessment of the use of Linear Fresnel Solar Collectors for the heat supply in traditional fruits and vegetable processing industries in Almeria’s province. This assessment is justified by the high availability of solar radiation in the area under study, the evaluation of complementary energy self-consumption...

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 t...

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,...

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 th...

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 pr...

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, an...

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 mod...

High Concentrator PhotoVoltaic (HCPV) is a recent PV technology generating electricity from solar radiation. Unlike conventional PV systems, it uses lenses and curved mirrors to focus solar rays onto small, but highly efficient Multi-junction (MJ) solar cells. Solar tracker and cooling systems are part of a standard CPV facility. Due to the complex...

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...

This paper outlines the development of models of a solar field designed to provide thermal energy to a Multi-Effect Desalination (MED) plant. The dynamic model can be used both for simulation and control purposes. Some of these models have been developed based on static and dynamic energy and mass balances, and some others are based on step respons...

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 E90...

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 espec...

The work reported in this paper extends previous work on the feasibility to characterise air leakage and mechanical ventilation avoiding intrusiveness of traditional measurement techniques. The feasibility to obtain the air renovation rate itself, as well as the possibilities to express it as function of other variables (such as wind speed, atmosph...

The agri-food chain consumes about one third of the world’s energy production with about 12% of it for crop production and nearly 80% for processing, distribution, retail, preparation and cooking. The agri-food chain also accounts for 80-90% of total global freshwater use where 70% alone is for irrigation. Additionally, on a global scale, freshwate...

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 solid...

Concentrador solar multi-modo El objeto de la invención es un captador solar constituido por un concentrador cilindroparabólico (CCP) aislado térmicamente (4), una cubierta de vidrio en su plano de apertura (1), un absorbedor tubular situado en su foco por el que circula un fluido caloportador (3), con o sin encapsulamiento de vidrio (2), y un mec...

Despite its huge potential for increasing sustainability, the use of solar energy in industry is still scarce. Many industrial thermal demands range from 120 to 250 °C, which are difficult to supply using solar energy because of the lack of specific solar thermal conversion devices. Parabolic-trough collectors (PTCs) suitable for these applications...

A comprehensive analysis of data from different networks of weather stations of Andalucía (Southern Spain) and standard climatic data sources has been carried out. A special attention has been paid in characterizing the different sources of uncertainty to be taken into account in input solar radiation data used for modelling of solar thermal system...

This work presents an overview of the potential use of solar energy systems for agro-industrial processes in Southern Spain, with a more specific interest in the province of Almería, a location with high levels of radiation where the existence of a productive model based on intensive agricultural exploitations has resulted in an ongoing process of...

Recent international and national reports establish conclusively that the heat demands from industrial processes in locations with high levels of insulation, such as Andalusia (Spain), are one of the sectors with the greatest potential for development and implementation of solar concentration technologies. This class of applications, characterized...

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 7 bar with an total annual consumption of...

In the modern agriculture, greenhouses are well established as technological solutions aimed to increase plants productivity and crops quality. Greenhouses can include added capabilities for the energy generation by the integration of photovoltaic solar modules in their cladding areas provided that the blocking effect of photosynthetically active r...

The aims of the present paper are to evaluate solar performances of a solar adsorption refrigerating machine and the amount of cold produced according to sunspots of different regions of Morocco. We have developed a model that simulates the transient behavior of the machine. Indeed, the essentially variable solar radiation implies that the machine...

RESUMEN Los invernaderos son sistemas productivos caracterizados por un aprovechamiento intensivo y eficaz de los recursos primarios. De forma adicional y fuera de lo que son los procesos favorecidos por su propia configuración estructural como los relacionados con el acondicionamiento climático interior y la aportación de radiación fotosintéticame...

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 contribut...

La mayor parte del tiempo, las personas realizan sus actividades cotidianas en el interior de edificios, siendo por tanto preciso encontrar un compromiso entre el ahorro energético y el bienestar de los usuarios. Este es un factor muy importante ya que la falta de confort tiene un efecto directo en la productividad de los usuarios, y un efecto indi...

Small-sized parabolic-trough collectors, PTCs, are the concentrating solar system technology with the highest potential for thermal energy demand at temperatures up to 250°C. The main applications in this temperature range are industrial process heat production, heat-powered refrigeration and cooling (especially double-effect absorption chillers) a...

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...

La mayor parte del tiempo, las personas realizan sus actividades cotidianas en el interior de edificios, siendo por tanto preciso controlar las condiciones de confort (térmico, visual y calidad de aire) en el interior de los mismos, intentando minimizar el consumo energético simultáneamente. Este trabajo presenta una revisión de técnicas de control...

Most of the time, people usually do their daily activities inside a building. Thus, it is necessary to reach comfort conditions for the people. This paper presents a hierarchical control system which allows to obtain a high comfort level, optimizing the use of HVAC (Heating, Ventilation and Air Conditioning) systems and actuators while minimizing e...

En este trabajo se analizan los resultados de confort térmico obtenidos a partir de la monitorización continua del CDdI CIESOL del proyecto ARFRISOL en la Universidad de Almería. El estudio de confort se realiza en dos modos de operación de los espacios ocupados, en modo free float y en modo activo con el fin de valorar el comportamiento pasivo del...

Este trabajo presenta del sistema de monitorización y control empleado en los CDdI del proyecto ARFRISOL desarrollado en el marco del sub-proyecto 7, Evaluación Energética y Calidad del Aire. Dicho sistema consta de un motor de adquisición desarrollado en un sistema SCADA adaptable a los diferentes CDdIs del proyecto con una interfaz gráfica especí...

The aim of the current paper is to propose a study of a novel solar adsorptive cooling system, using activated carbon-ammonia pair, coupled with a parabolic trough collector (PTC) and a water-stainless steel heat pipe. A theoretical model, based on the thermodynamics of the adsorption process, heat and mass transfer within the porous medium and ene...

Este trabajo presenta un estudio preliminar necesario para la realización de un sistema de control del confort térmico de los ocupantes de un edifi cio, en este caso, el edi ficio CIESOL situado en el Campus Universitario de la Universidad de Almería. El estudio está basado en el índice PMV proporcionado por los estándares de este área (ISO 7730, A...

Este trabajo presenta el diseño, implantación y explotación del sistema de adquisición de datos desarrollado en el edifi cio bioclimático CIESOL, Centro Mixto entre la Universidad de Almería y el CIEMAT (www.ciesol.es). Tras una breve exposición sobre el diseño del sistema de adquisición, donde se describen las principales características de la apl...

This article suggests a numerical study of a continuous adsorption refrigeration system consisting of two adsorbent beds and powered by parabolic trough solar collector (PTC). Activated carbon as adsorbent and ammonia as refrigerant are selected. A predictive model accounting for heat balance in the solar collector components and instantaneous heat...

This paper presents the study of solar adsorption cooling machine, where the reactor is heated by a parabolic trough collector (PTC) and is coupled with a heat pipe (HP). This reactor contains a porous medium constituted of activated carbon, reacting by adsorption with ammonia. We have developed a model, based on the equilibrium equations of the re...

Cet article propose une étude d’une machine frigorifique à adsorption fonctionnant par l’énergie solaire, le réacteur contenant le couple (charbon actif / ammoniac) est chauffé moyennant un caloduc couplé avec un concentrateur cylindro-parabolique solaire. Ainsi nous avons développé un modèle théorique basé sur les équations de conservation d’énerg...

This paper presents the experimental results and specific thermal and energetic saving analysis from the systematic monitoring carried out to analyse the energetic performance of a building with an innovative component, which is based on an optimisation of the sawtooth roof concept. This component has been installed at a building of the University...

The energy loss from plants leaves and other interface surfaces to the sky is a relevant component of the surface radiation budget (SRB). This heat transfer mechanism plays a major role in many climate dependent ecological processes, especially during calm and clear sky night periods, when these loses can produce interface temperatures lower than a...

This paper presents a parametric study with which the factors and variables involved in determining beam, diffuse and reflected solar gains for the glazed parts of any saw-tooth roof can be estimated. The developed model has been applied to significant cases of saw tooth roofs facing the equator, obtaining some annual reference patterns for these f...

The assessment the radiative cooling potential requires the knowledge of some site dependent boundary conditions affecting to the performance of the respective technological systems. These boundary conditions are mainly related to the existence of certain climatological solicitations that will determine the feasibility or not for each application....

Different applications dealing with plant physiology, biomass production and natural illumination in greenhouses require knowledge of the photosyntheticallyactiveradiation. In absence of measurements of this flux, one must rely on parametric approaches. In this way, the radiant energy is computed using available atmospheric parameters. In the prese...

In this work the authors present the results of field experiments carried out in Almería (36.8N, 2.42W), a seashore location in southeastern Spain, in order to evaluate the performance of Eppley precision infrared radiometer (PIR) pyrgeometers. The authors estimate the systematic errors in the measurements of downward longwave radiation caused by s...

This paper presents the obtained results of a real case study of an innovative building component, which is based on an optimisation of the sawtooth roof concept. This component has been installed at the University of Almería and it has been supported within the MEDUCA Project (Model Educational Buildings for Integrated Energy Efficient Design, con...

Libro de texto universitario para prácticas de energía solar, estructurado en dos partes. La primera sección presenta los fundamentos teóricos y comprende tres capítulos, relativos a las propiedades, componentes e instrumentos de medición de la radiación solar; a la producción de energía mediante sistemas fotovoltaicos y a las principales caracterí...