Parabolic trough solar collectors

Malekan, Mohammad; Khosravi, Ali; Assad, Mamdouh El Haj

doi:10.1016/b978-0-12-821602-6.00007-9

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…2024, 5, FOR PEER REVIEW 11 where 𝑄 is the convection heat transfer rate, ℎ is the convection heat transfer coefficient, 𝐴 is the surface area, 𝑇𝑠 is the surface temperature of the object and 𝑇𝑎 is the temperature of the surrounding air (22 °C). The convective heat transfer coefficient of air can be estimated utilizing the Nusselt number, in which the Nusselt number itself varies, depending on problem geometry and flow conditions [59]. For this case (natural convection), the studied geometry consists of planar surfaces, so the convection coefficient can be estimated as 5 W/m * C for the side surfaces and 2 W/m * C for the bottom surface.…”

Section: Numerical Modelingmentioning

confidence: 99%

Parametric Numerical Study and Multi-Objective Optimization of Composite Curing through Infrared Radiation

Gkertzos,

Kotzakolios,

Katsidimas

et al. 2024

Applied Mechanics

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Composite curing through infrared radiation (IR) has become a popular autoclave alternative due to lower energy costs and short curing cycles. As such, understanding and measuring the effect of all parameters involved in the process can aid in selecting the proper constituents as well as curing cycles to produce parts with a high degree of cure and low curing time. In this work, a numerical model that takes inputs such as part geometry, material properties, curing-related properties and applied curing cycle is created. Its outputs include the degree of cure, maximum curing temperature and total curing time. A genetic algorithm and a design of experiments (DOE) sequence cover the range of each input variable and multiple designs are evaluated. Correlations are examined and factor analysis on each output is performed, indicating that the most important inputs are activation energy, specimen precuring, applied curing temperature and curing duration, while all the others can be considered constant. Finally, response surfaces are created in order to effectively map and provide estimations of the design space, resulting in a curing cycle optimizer given certain restrictions over the input parameters.

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Section: Numerical Modelingmentioning

confidence: 99%

Parametric Numerical Study and Multi-Objective Optimization of Composite Curing through Infrared Radiation

Gkertzos,

Kotzakolios,

Katsidimas

et al. 2024

Applied Mechanics

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“…Currently, parabolic trough collector (PTC) technology stands out among CSPs for having the largest number of power generation plants installed worldwide [16]. The PTC system is composed of a primary reflection area, generally constructed with high reflectance mirrors that direct the direct normal radiation (DNI) to a secondary concentration system or linear focal point [17].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a parabolic cylinder collector applying the Monte Carlo ray tracing method

Tarazona-Romero,

Castillo Leon,

Ascanio Villabona

et al. 2024

Sustainable Engineering and Innovation

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The purpose of this article is to evaluate the performance of a prototype parabolic trough collector for three proposed scenarios, where geometric designs with optical characteristics are tested according to the appropriate technological paradigm; low cost of maintenance and implementation, intensive local labor, materials and resources of the implementation area. The device was developed by the Energy, Automation and Control Systems Research Group GISEAC of the Unidades Tecnológicas de Santander for low-cost water heating; using materials and labor for its fabrication easily available locally. Monte Carlo ray tracing methodology was applied using the open-access software SolTrace and Tonatiuh. To select the geometric scenario to be simulated, the edge angle and the width of the primary reflection system of the device were varied. The results obtained showed that the aperture of the parabola has a direct impact on the drop in the concentration ratio (CR) percentage value and the performance of the prototype.

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“…DNI that is concentrated in the focal point, transfers the heat produced by concentrated solar rays, transferring the heat to the heat transfer fluid [19]. This heat can be used for heating water or steam production, applied to electric power generation processes or thermal processes [20].…”

Section: Introductionmentioning

confidence: 99%

Diseño y construcción de un sistema de seguimiento solar para un prototipo de colector cilindro-parabólico

Tarazona-Romero,

Rincón Quintero,

Ascanio Villabona

et al. 2023

Sci. tech

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La búsqueda de alternativas tecnológicas para satisfacer diversas necesidades globales, ha desencadenado un arduo proceso de investigación y desarrollos tecnológicos a nivel mundial para el aprovechamiento de los recursos renovables. Por su parte, los colectores lineales cilindro-parabólicos, han demostrado ser una alternativa para realizar el proceso de calentamiento de agua y para la producción de energia eléctrica. Por su parte, el grupo de investigación en sistemas de energia, automatización y control (GISEAC) de las unidades Tecnológicas de Santander, desarrollo un prototipo de colector Cilindro-Parabólico con materiales de bajo coste y disponibles en la región (Bucaramanga, Colombia). En consecuente, para mejorar el rendimiento del dispositivo, en este documento se presenta el dimensionamiento, implementacion y testeado de un sistema de seguimiento de trayectoria solar en un solo eje, en un colector Cilindro-Parabólico a pequeña escala, aplicando un sistema de control de lazo cerrado. El sistema de control está gobernado por un sistema integrado por un módulo ESP32 y un microcontrolador Raspberry PI3. El eje del dispositivo esta acoplado a un mecanismo compuesto por un sistema de transmisión de engranajes y cadenas, acoplado directamente a un motor eléctrico. El posicionamiento del Angulo del colector está determinado por un sensor que mide directamente la cantidad de LUX e identifica por medio del algoritmo desarrollado, la ubicación con mayores niveles de radiación solar directa incidente. De esta manera, el sistema puede seguir la posición solar durante todo el transcurso del día solar. Finalmente, se puede resaltar que el porcentaje máximo de desviación del sistema de seguimiento solar, es inferior al 1%. A su vez, el rendimiento del sistema de seguimiento de trayectoria solar implementado “Sistema de seguimiento solar Automático”, aumento en un porcentaje superior al 40 % respecto al sistema de seguimiento inicial “Sistema de seguimiento solar manual”.

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Parabolic trough solar collectors

Cited by 13 publications

References 44 publications

Parametric Numerical Study and Multi-Objective Optimization of Composite Curing through Infrared Radiation

Parametric Numerical Study and Multi-Objective Optimization of Composite Curing through Infrared Radiation

Performance evaluation of a parabolic cylinder collector applying the Monte Carlo ray tracing method

Diseño y construcción de un sistema de seguimiento solar para un prototipo de colector cilindro-parabólico

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