Thermo-economic and exergy analysis and optimization of small PTC collectors for solar heat integration in industrial processes

Ghazouani, Mokhtar; Bouya, Mohsine; Benaı̈ssa, M.

doi:10.1016/j.renene.2020.01.109

Cited by 33 publications

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“…Solar thermal collectors are devices in charge of transforming solar energy into thermal energy through different operating principles that vary according to the type of collector used [14]. The main aspects to be taken into account in industrial applications for installing a solar thermal system are the target temperature, energy requirement, economic criteria, space availability and degree of maturity of the technology analyzed [15]. Based on temperature ranges and the use in industry, this work covers low and medium temperature collectors.…”

Section: The Use Of Solar Thermal Energymentioning

confidence: 99%

“…Similarly, the ranges associated to the reduction of greenhouse gas emissions by substituting electricity The study by means of dynamic modeling of a solar field with PTCs, for water heating in the process of drying Italian pasta in an Italian factory, evidenced that the design of this system has the capability of guaranteeing 23 % of the weekly thermal energy demand used in this process [11]. In the work by Ghazouani, Bouya and Benaissa [15], the design and operating parameters of a small PTC were analyzed with the purpose of maximizing the thermal and economic efficiency and the energy performance under the meteorologic conditions of the city of Rabat; with the improvement of the technical features of the collector they were able to supply more than 12.84 MWh/year at a competitive smaller cost of 0.022 USD/kWh with each device.…”

Section: Application Of Solar Thermal Energy In Industrymentioning

confidence: 99%

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Section: The Use Of Solar Thermal Energymentioning

confidence: 99%

Section: Application Of Solar Thermal Energy In Industrymentioning

confidence: 99%

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“…Los colectores solares térmicos son dispositivos encargados de transformar la energía solar en térmica a través de diversos principios de funcionamiento que varían según el tipo de colector empleado [14]. En aplicaciones industriales los principales aspectos a tomar en cuenta para instalar un sistema solar térmico son la temperatura objetivo, el requerimiento energético, los criterios económicos, la disponibilidad del espacio y el grado de madurez de la tecnología analizada [15]. Basándose en los rangos de temperaturas y uso en la industria, este trabajo abarca a los colectores de baja y media temperatura.…”

Section: La Energía Solar Térmica Y Su Aprovechamientounclassified

“…a c e p t a d a El estudio mediante la modelación dinámica de un campo solar con colectores PTC, para el calentamiento de agua en el proceso de secado de pasta en una fábrica italiana, evidenció que el diseño de este sistema tiene la capacidad de garantizar el 23 % de la demanda de energía térmica semanal empleada en este proceso [11]. En el trabajo de Ghazouani, Bouya y Benaissa [15] se analizaron los parámetros de diseño y operativos de un PTC pequeño con el fin de maximizar la eficiencia termoeconómica y el rendimiento energético con las condiciones meteorológicas de la ciudad de Rabat; con la mejora de las características técnicas del colector consiguieron proporcionar más de 12,84 MWh/año a un costo competitivo menor a 0,022 USD/kWh con cada dispositivo.…”

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El consumo energético asociado al sector de la industria representa el 38 % de la demanda de energía a nivel global, siendo un aspecto importante que marca el desarrollo de un país. En este sentido, es sumamente importante diversificar las distintas fuentes de energía e incorporar el uso de fuentes renovables de energía, como la solar, no solamente con la idea de asegurar el suministro energético, sino también considerando como elementos que permitan la reducción de las emisiones generadas por el uso de combustibles fósiles. El presente trabajo aborda las principales tecnologías de colectores solares que pueden ser incorporadas a distintos tipos de industrias, basado en experiencias e investigaciones en otros países. Sobre la base de esta revisión, se ha visto que una buena parte de las industrias a nivel mundial requieren temperaturas en sus procesos hasta los 250 °C, lo que hace idóneo el uso de esta tecnología. En función de cada industria, se podrán usar colectores solares de placa plana, de tubos de vacío, del tipo Fresnel o cilindro parabólicos. Por último, se detallan los ahorros asociados a algunas instalaciones y se abordan los desafíos relacionados con este sector.

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“…The constant outlet temperature strategy shows a decrease of 0.3 years for the payback period. Ghazouani et al [9] performed an optimization based on genetic algorithms, in which the hourly mass flow rates in a small PTC and the different design parameters were optimized. No storage unit was considered, and the heat demand was assumed as constant over the year.…”

Section: Introductionmentioning

confidence: 99%

Solar Field Output Temperature Optimization Using a MILP Algorithm and a 0D Model in the Case of a Hybrid Concentrated Solar Thermal Power Plant for SHIP Applications

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Using solar power for industrial process heat is an increasing trend to fight against climate change thanks to renewable heat. Process heat demand and solar flux can both present intermittency issues in industrial systems, therefore solar systems with storage introduce a degree of freedom on which optimization, on a mathematical basis, can be performed. As the efficiency of solar thermal receivers varies as a function of temperature and solar flux, it seems natural to consider an optimization on the operating temperature of the solar field. In this paper, a Mixed Integer Linear Programming (MILP) algorithm is developed to optimize the operating temperature in a system consisting of a concentrated solar thermal field with storage, hybridized with a boiler. The MILP algorithm optimizes the control trajectory on a time horizon of 48 h in order to minimize boiler use. Objective function corresponds to the boiler use, for completion of the heat from the solar field, whereas the linear constraints are a simplified representation of the system. The solar field mass flow rate is the optimization variable which is directly linked to the outlet temperature of the solar field. The control trajectory consists of the solar field mass flow rate and outlet temperature, along with the auxiliary mass flow rate going directly to the boiler. The control trajectory is then injected in a 0D model of the plant which performs more detailed calculations. For the purpose of the study, a Linear Fresnel system is investigated, with generic heat demand curves and constant temperature demand. The value of the developed algorithm is compared with two other control approaches: one operating at the nominal solar field output temperature, and the other one operating at the actual demand mass flow rate. Finally, a case study and a sensitivity analysis are presented. The MILP’s control shows to be more performant, up to a relative increase of the annual solar fraction of 4% at 350 °C process temperature. Novelty of this work resides in the MILP optimization of temperature levels presenting high non-linearities, applied to a solar thermal system with storage for process heat applications.

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Thermo-economic and exergy analysis and optimization of small PTC collectors for solar heat integration in industrial processes

Cited by 33 publications

References 37 publications

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Solar Field Output Temperature Optimization Using a MILP Algorithm and a 0D Model in the Case of a Hybrid Concentrated Solar Thermal Power Plant for SHIP Applications

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