Abstract
Based on the observation of the effects of energy generation on climate change, efforts have been carried out to develop technologies to reduce polluting energy sources. In this context, the rational use and improvement of the efficiency of water heating systems can play an important role, contributing to lower energy consumption. This study evaluated a prototype for water heating for use in agroindustry. The prototype was designed for a possible utilization of mechanical energy in order to change the magnetic flux produced by permanent magnets, generating thermal energy by Foucault currents. This system presented yields of 64.74%, 65.13% and 64.48% for the rotor configurations with six magnets without pole reversal (6ISI), four magnets with reversal (4ICI), and four magnets without reversal (4ISI), respectively. For comparison purposes, a resistive water heating system was also evaluated for the same study conditions, obtaining an efficiency of 89.21%. The proposed inductive system did not present satisfactory results for constructive conditions presented in the study.
Highlights
IntroductionFor the most varied purposes, often comes from the burning of wood, due to its good cost-benefit ratio
Water heating in agroindustry, for the most varied purposes, often comes from the burning of wood, due to its good cost-benefit ratio
In Brazil, the year 2017 witnessed an increase in energy consumption by 1.8% compared to 2016 (Ministry of Mines and Energy, 2018); a minimum growth rate in end energy consumption of 2.2% per year is projected for 2010-2030, 39% of the total consumption is represented by industries (Ministry of Mines and Energy, 2016)
Summary
For the most varied purposes, often comes from the burning of wood, due to its good cost-benefit ratio. There is an abundant consumption of heated or steamed water in the various production and manufacturing processes, such as in the beverage, food and dairy industries. In Brazil, it is estimated that energy efficiency strategies may account for up to 18% of total energy consumption and 17% of electricity by 2050 Examples of these strategies are the use of biogas for heating or distributed generation, solar energy, and processes optimization, among others (Ministry of Mines and Energy, 2016). Romanovsky and Mutale (2012) evaluated low-frequency magnetic induction for water heating, inducing Foucault currents on the walls of the tank. This study aimed to build and evaluate a water heating prototype using Foucault currents, generated by the variation of the magnetic field provided by permanent magnets
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