Browsing by Author "Acurio, Eliana"

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Controller design for high-energy-efficient performance of a household refrigerator using inverter technology
(LACCEI Inc., 2020-07) Hermosa, Freddy; Tasiguano, Cristian; Pozo, Marcelo; Acurio, Eliana
This work presents the control design of a domestic refrigeration system by using a variable speed compressor(inverter technology) with the main purpose of reducing energy consumption and complying with Ecuadorian standards for this type of household appliances. A study on refrigeration systems is carried out, its operating principles are discussed and a comparison between conventional systems and the variable speed technology is performed. Additionally, an analysis of the refrigeration control is included and the variable speed controller is implemented in a prototype card, which was installed in a domestic R12 refrigerator. The system exhibits a reduction of 27% in the consumption test regulated by the RTE INEN 035 and the NTE-INEN 2 206 norms, which demonstrates its high energy efficient performance.
Design and Implementation of an Automatic System for Dielectric Characterization of Ceramic Materials
(LACCEI, Inc., 2019-07) Valladares, Sara; Tasiguano, Cristian; Narváez, Fernanda; Acurio, Eliana; Lascano, Luis
This article describes the design and implementation of an automatic dielectric characterization system by using the non-destructive technique of the complex impedance spectroscopy. This method allows obtaining the dielectric constant and the complex impedance for a wide range of temperatures and different frequencies of the applied field. The developed user interface eases the configuration of two impedance analyzers and the setup of the characterization test. Additionally, test reports are automatically generated from the measurements, which simplify the experimental analysis by plotting the more important parameters in the dielectric characterization. One of these parameters, the peak of the graph Er´ (real part of the dielectric constant) vs. temperature, which is the phase transition temperature from the ferroelectric to the paraelectric state of the ceramic materials, is obtained and compared to reference values to demonstrate the system correct functioning.
Diseño y construcción de un sistema automático de polarización de cerámicas ferroeléctricas
(LACCEI Inc., 2020-07) Romo, Denis; Tasiguano, Cristian; Lascano Lascano, Luis Rodrigo; Acurio, Eliana
En este trabajo se muestra el dise˜no y construcción de un polarizador automático para cerámicas ferroeléctricas, garantizando seguridad y facilidad de manejo al usuario durante todo el proceso. El polarizador está compuesto por un suministro de corriente directa de alto voltaje y un sistema de calentamiento. El suministro de alto voltaje se ha diseñado utilizando un circuito reductor de voltaje de topología Buck, un convertidor de corriente continua a corriente alterna (DC/AC), un transformador de alta frecuencia, que proporciona aislamiento galvánico, y una etapa multiplicadora de voltaje. El sistema de calentamiento se alimenta a través de un circuito de control de fase directo y la temperatura del proceso se regula por medio de un controlador proporcional integral (PI). Como resultado del correcto funcionamiento del prototipo se obtiene mediciones de la constante piezoeléctrica de carga d33 de una muestra de K0.5Na0.5NbO3 (92.7 y -95.5) dentro del rango especificado en la literatura para este compuesto.