Heating efficiency comparison of induction heating and electric heater

Abstract

This research article studies, a hot air production system using electromagnetic induction heating for a thin-walled, smooth-surfaced hollow metal cylinder with an electric power of 1,800 W. It is expected that can be used as a heat source for drying agricultural products after harvesting in the future. In the experiment, the flow rate of air fed into the heating system was used in the form of Reynolds number in the range 6,000, 7,000, and 8,000. Four hot air temperatures were studied at 50, 60 and 70 °C and an induction heating was compared to 1,000 W electric heating. The results found that an outlet air temperature of 50 °C, an induction heating takes 79.55-84.96% less time than electric heating, consume 66.13-70.96% less power and, energy efficiency of more than 67.11-73.43%. An outlet air temperature of 60 °C, induction heating takes 71.30-72.24% less time than electric heating, consume 64.44-67.58% less power and, energy efficiency of more than 50.42-53.77%. An outlet air temperature of 70 °C, induction heating takes 54.46-62.03% less time than electric heating, consume 59.43-64.31% less power and, energy efficiency of more than 26.02-32.99%. The induction heating provides, the rising temperature rapidly at the first period of testing. This is different from an electric heater which has a slower temperature increasing.