Power generation using renewable technologies has become a primordial option to satisfy the energy demand all over the world, with solar concentrating technologies widely applied for this purpose. A combination of a parabolic trough collector with direct steam generation has been considered an excellent option for power generation as the economic cost and complexity in the plant are reduced. The thermal evaluation of a solar power plant as well as the PTC in the DSG process is very important in viability and economic analyses. In this sense, as the main objective of this work, a numerical tool for evaluating DSG with PTC technology was developed. The SOLEEC software is a versatile, reliable, accurate, and user-friendly option to thermally evaluate a DSG with PTC technology. The user has the possibility of comparing the thermal behavior of different geometrical dimensions for a PTC and even consider different materials to satisfy the demand of superheated steam by a DSG process. The software has an error of less than 5% when compared with the literature results and was used in this paper to evaluate a power plant in Mexico, showing that the change to DSG proposing different PTC could reduce the solar field by about 35%.
El presente trabajo surge de la problemática del uso racional de la energía eléctrica, por lo que se desarrolló una propuesta de control del consumo eléctrico para optimizar el ahorro. La propuesta contempla un sistema usando lógica difusa que permite la toma de decisiones con base a reglas de sentido común, permitiendo personalizar las características de las necesidades específicas. El proyecto fue desarrollado a partir de los datos de un sistema de cogeneración con la finalidad de maximizar su contribución. Se utilizaron valores rígidos a la salida para la habilitación y des-habilitación de cargas de consumo variable no prioritarias, el sistema de control difuso fue implantado bajo una plataforma FPGA como factor clave en esta propuesta. Los resultados obtenidos muestran la respuesta del sistema a las reglas propuestas basadas en los hábitos de consumo del usuario y en una clasificación de las cargas de acuerdo con su consumo y tiempo de uso promedio.
This paper present a new circuit designed to support high accuracy reference voltages over a nearly full range of the power supply. To achieve this, the circuit is designed to be efficient utilizing a CMOS floating gate memory fabricated in 1.2 gm CMOS process. The memory stores voltages as charge on the floating gate of a pMOS transistor. The output voltages of the circuit are easily programming by simply modifying the value of the floating gate through the tunnelling and injection hot electrons mechanisms. Also, the circuit can drive a resistive load with the advantage of reduced both silicon area and dissipated power on chip.
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