Repositorio de Investigación Universidad Católica de Cuenca

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Uso de métodos difusos para la gestión del mantenimiento de transformadores aéreos de distribución

(Universidad Católica de Cuenca., 2025) Guamán Tapia, Henry Patricio; Nieves Arce, Juan Diego; Cabrera Mejía, Javier Bernardo; 0105214480; 0105945299

This work develops a maintenance management model for distribution transformers in power distribution companies, using Centrosur C.A. Electrical Company as a case study. The model is based on fuzzy logic and the concept of forgotten effects. The main objective is to identify and prioritize key factors that traditional methods often overlook when performing transformer maintenance. The study involves an expert analysis to characterize and assess the most frequent failures, considering the causal relationships between variables related to the transformer health index. Based on a review of the state of the art, the fuzzy logic method is employed, allowing for the classification of analysis variables, risk minimization, performance enhancement, and an extended transformer lifespan. The results indicate that the most influential variables in maintenance management exhibited incidence values ranging between 0.5 (moderate) and 0.6 (high). Furthermore, the study proposes a systematic framework that prioritizes maintenance actions, defining the optimal starting point and ensuring a more reliable and sustainable operation. This framework is grounded not only in expert knowledge but also in a mathematical model. Keywords: neglected effects, maintenance management, expert judgment, fuzzy logic, transformer

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Evaluación del rendimiento de la bomba de calor alimentada por energía fotovoltaica para el calentamiento de agua

(Universidad Católica de Cuenca., 2025) Loayza Román , Mario Francisco; Siguencia Siguenza, Oscar Mauricio; 0706330628

This study assessed the thermal and energy performance of a photovoltaic-powered heat pump system for domestic water heating in a residential home. The system sizing considered the demand for domestic hot water (DHW), the energy consumption of the heat pump, and the photovoltaic generation capacity. In addition, the system’s efficiency and economic viability were analyzed using indicators such as the Net Present Value (NPV) and Internal Rate of Return (IRR). The methodology included the collection of data on DHW consumption through a survey and the characterization of the solar resource. System components, such as the heat pump, storage tanks, and photovoltaic system, were also selected and sized. MATLAB simulations were used to analyze the thermal behavior of the tanks as well as the daily and annual energy variability. Finally, the economic viability was assessed by considering the initial investment, operating costs, and electricity savings. The results showed that the photovoltaic system can cover the demand of the heat pump and generate surpluses in certain months, which were partially used to supply the building's energy load. However, the economic viability indicators, NPV and IRR, were not favorable.