Abstract
Abstract This study was aimed at the heating tank with a screw-rotation device for improving the thermalefficiency of electric boiler. In the proposed system, analysis items were the heater rod surfacetemperature variation, reaching time for set temperature and thermal efficiency. The followingconclusions are obtained from this experimental study. (1) When screw speed increases, the timereaching for set temperature tended to be shorter. (2) When the rotation speed becomes 300 rpm, thesurface temperature difference between the right and left heater rod decreases by 49%, from 19.7 o C to9.7 o C in average. (3) When the rotation speed is over 250 rpm, proposed heating tank structure appearedto be effective in terms of thermal efficiency. Thermal efficiency with the rotation speed 300 rpm isimproved by 3.8% compared to the case of rotation speed 0 rpm.Keywords: Electric boiler(전기보일러 ), Heater rod(히터봉 ), Heating tank(가열탱크 ), Screw(스크류 ),rpm(회전수 ), Thermal Efficiency(열효율 ) 기호설명 G : 유량 [kg/s]C : 유체의 비열 [kJ/kg
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