JP Journal of Heat and Mass Transfer
Volume 14, Issue 3, Pages 353 - 366
(August 2017) http://dx.doi.org/10.17654/HM014030353 |
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ANALYTICAL AND EXPERIMENTAL METHOD ON OVERALL HEAT TRANSFER COEFFICIENT OF THE INDUCTION FURNACE I.7506
Wahyono Suprapto, M. F. Femiana Gapsari and H. Nafisah Arina
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Abstract: In an induction furnace, the electrical energy transforms into heat by kanthal wire magnetic field in refractory jacket. The construction of smelting furnace I.7506 consists of ladle in the refractory jacket’s interior and the exterior is isolated with refractory brick and glass wool and strengthened with steel plate. Two primary requirements of a melting furnace are the ladle temperature above the melting point of the metal and low heat loss. The radiation heat transfer as effective heat and conduction heat transfer as lost heat are demonstrated by the ladle temperature and steel plate. The purpose of this research is to refine smelting operation and reduce energy consumption and heating loss.
In this experiment, the heat effective and heat loss were observed by measuring the electrical current and voltage of the kanthal wire. Every 15 minutes, the observation data of electric energy consumption and the temperature of ladle, refractory jacket, and steel plate were retrieved. This research utilized several tools such as induction electric furnace I.7506, Ampere-Volt clamp meter, infrared thermometer gun, and stopwatch.
The heat transfer inside the furnace plays a significant role in determining thermal efficiency. The longer the furnace operates, the more energy consumption and heating loss it takes. However, in the eighth 15 minutes, the energy consumption tended to decrease and the heating loss kept increasing. The profile of theoretical and experimental temperature demonstrated similar tendency, yet the experimental value was less than the theoretical value. |
Keywords and phrases: refractory jacket, ladle, steel plate, used heat, overall heat transfer. |
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