• Title/Summary/Keyword: 과열

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Quality Characteristics of Ginseng Treated by Hot Air Drying after Being Dried using Super-heated Steam (초급속 과열증기를 이용한 인삼의 품질 특성)

  • Kim, Kyung-Tack;Hong, Hee-Do;Kim, Sung-Soo
    • Journal of Ginseng Research
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    • v.33 no.4
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    • pp.361-366
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    • 2009

  • This research aims to develop a new drying technology using super-heated steam to reduce the time required for drying ginseng and to enhance its quality. The drying rate of ginseng powder treated with hot-air drying after drying with super-heated steam was about 40% faster than the drying rate of ginseng powder treated with hot-air drying. Minimal difference was found between hot-air drying and hot-air drying after drying with super-heated steam in the general composition of the ginseng powder, such as its crude lipid, crude protein, crude fiber, and ash. Moreover, no difference was found between hot-air drying and hot-air drying after drying with super-heated steam in terms of the ginseng powder's mineral and free sugar contents. The crude saponin contents was 5.43% in the ginseng treated with hot-air drying and 5.4% in the ginseng treated with hot-air drying after drying with super-heated steam. The ginseng powder that was treated with hot-air drying after drying with super-heated steam had a slightly higher redness compared to the ginseng powder that was treated with hot-air drying alone. The number of microorganisms of the ginseng powder treated with hotair drying after drying with super-heated steam showed a reduction of one log cycle in the total bacteria and two log cycles in the yeast molds compared to the ginseng powder treated with hot-air drying alone.

  • https://doi.org/10.5142/JGR.2009.33.4.361 인용 PDF KSCI

CASE 전력기술상담

  • 전명수
    • Electric Engineers Magazine
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    • v.178 no.6
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    • pp.46-49
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    • 1997

  • 각상별로 다수의 단심 케이블을 병렬로 사용할경우 부하전류의 분배가 동일하지 않으므로 전류가 많이 흐르는 케이블이 과열되니 심한 경우는 설계값의 30%이상 부하를 걸 수 없는 정도도 발생하였다.

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Effect of degree of superheat of LiBr aqueous solution on the vapor absorption process for an air-cooled absorption cooling system (공냉형 흡수식 냉방 시스템에서 LiBr 수용액의 과열도가 증기 흡수에 미치는 영향)

  • Kim, S.C.;Oh, M.D.;Lee, J.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.2
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    • pp.122-133
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    • 1997

  • Numerical analysis using finite volume method has been carried out to examine the effect of degree of superheat of LiBr aqueous solution on heat and mass transfer occurred in absorption process. According to the result of this study, it was found that refrigerant vaper was generated at the entrance region of absorber when LiBr aqueous soltion was superheated. As the degree of superheat increases, heat transfer rate increases and vapor absorption rate decreases. The increase in averaged Nusselt and Sherwood numbers could be found as film Reynolds number increases. The larger the degree of superheat, the greater the averaged Nusselt and Sherwood numbers.

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