• Title/Summary/Keyword: 발열 특성

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전동기의 열회로계산

  • 김방광;최진원
    • 전기의세계
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    • v.30 no.12
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    • pp.761-763
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    • 1981

  • Computer의 도움으로 복잡한 선형회로망의 해석이 숩게 되자, 전기기계의 열회로에 관한 연구와 실험이 많은 전기기계 Maker에 의해서 수행되어 지고 있다. 열회로라는 것은 각 부분의 온도를 전위(potential)로 보고, 발열체는 current source 로 보아, 온도차에 의해서 열이 전달되는 현상을 전위차(전압)에 의해서 전류가 흐르는 회로로 변환한 것을 말하는 데 전동기에 있어서의 열특성은 열저항과 열용량으로 계산되어 지고 있다.

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A Study on the Thermal and Electrical Characteristics with Manufacture of the Heating Element by Using Carbon with Bar Type (봉상 카본 발열체의 제조와 열 및 전기적 특성에 관한 연구)

  • 배강열;이광성;정한식;정희택;정효민
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.5
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    • pp.430-437
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    • 2004

  • This paper is intended as an investigation of study on the thermal and electrical characteristics of the carbon heating element. In this experimentation, the electric material used is the crystalline graphite a kind of natural graphite. The bentonite is used to solidify the heating element and the vacuum furnace is used for sintering it. It is noted that the natural drying time should be at least 58 hours. The plating of the electric pole with the electroless nickel showed the lowest contact resistance among others. The resistance shows linear variation with regard to length. For the insulation and resolution, the glaze coating is best with 80% of water content. The temperature rising characteristic of the heating element is better than sheath heater saving 43% of rising time. The correlation equation for temperature was obtained with the electric power.

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An Experimental Study on the Characteristics of Hydration Heat Generation of Low Heat Concrete with Binder Types (결합재 종류에 따른 저발열 콘크리트의 수화발열 특성에 관한 실험적 연구)

  • Kim, Yong-Ro;Jung, Yang-Hee;Lee, Sang-Ho;Kim, Do-Su;Khil, Bae-Su;Han, Seung-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.417-420
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    • 2006

  • Recently, the attention is paid to the problem of thermal crack by hydration heat according to the increase of high strength and mass concrete structures. At this point, various research has been carried out for the control of hydration heat in high strength and mass concrete. As a part of the research, it was investigated application of hydration heat reduction agent (HR) for the control of thermal crack by hydration heat in this study. To investigate the application, it was selected HR which can reduce hydration heat of concrete with effect in series I and II. Also, it was investigated the characteristics of hydration heat generation of low heat concrete using HR with binder types in seriesIII.

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