Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Study on Thermal Performance of the Electric Boiler according to Screw Rotation Speed in Heating Tank

가열탱크 내부 스크류 회전속도에 따른 전기보일러의 열성능에 관한 연구

  • Kum, Jong-Soo (Department of Refrigeration & Air-conditioning Engineering, Pukyong National University) ;
  • Kim, Dong-Gyu (Specialized Graduate School Science & Technology Convergence, Pukyong National University) ;
  • Park, Jong-Il (Department of Building Systems Engineering, Dong-Eui University)
  • 금종수 (부경대학교 냉동공조공학과) ;
  • 김동규 (부경대학교 과학기술융합전문대학원) ;
  • 박종일 (동의대학교 건축설비공학과)
  • Received : 2015.08.03
  • Accepted : 2015.08.31
  • Published : 2015.09.01
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Abstract

This study was aimed at the heating tank with a screw-rotation device for improving the thermal efficiency of electric boiler. In the proposed system, analysis items were the heater rod surface temperature variation, reaching time for set temperature and thermal efficiency. The following conclusions are obtained from this experimental study. (1) When screw speed increases, the time reaching for set temperature tended to be shorter. (2) When the rotation speed becomes 300 rpm, the surface temperature difference between the right and left heater rod decreases by 49%, from $19.7^{\circ}C$ to $9.7^{\circ}C$ in average. (3) When the rotation speed is over 250 rpm, proposed heating tank structure appeared to be effective in terms of thermal efficiency. Thermal efficiency with the rotation speed 300 rpm is improved by 3.8% compared to the case of rotation speed 0 rpm.

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References

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