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대한안전경영과학회지 [Journal of Korea Safety Management & Science]

간행물 정보
  • 자료유형
    학술지
  • 발행기관
    대한안전경영과학회 [Korea Safety Management & Science]
  • pISSN
    1229-6783
  • eISSN
    2288-1484
  • 간기
    계간
  • 수록기간
    1999 ~ 2025
  • 주제분류
    공학 > 안전공학
  • 십진분류
    KDC 530 DDC 620
제19권 제4호 (32건)
No
31

소형선박 선외기용 전기동력 시스템 연구

박주식, 원준희

대한안전경영과학회 대한안전경영과학회지 제19권 제4호 2017.12 pp.309-316

※ 기관로그인 시 무료 이용이 가능합니다.

4,000원

Recently, the outboard engine system of internal combustion engine is widely used in the field of small ship propulsion. However, the internal combustion engine has serious problems of energy depletion and environmental problems, so electric propulsion methods are being studied. In this paper, we have developed important motors and controllers of electric propulsion system for small marine outboard motors. The motor design was performed through the motor characteristics analysis method, and the 30Kw system was developed through the BEMF processing circuit and the power conversion circuit by the embedded microprocessor. This study was carried out through government supported projects and achieved quantitative targets through accredited institutions.

32

구리나노입자가 코팅된 열교환기의 안전성 향상을 위한 임계 열유속 측정실험

모용현, 김남진, 전용한, 이덕수

대한안전경영과학회 대한안전경영과학회지 제19권 제4호 2017.12 pp.317-322

※ 기관로그인 시 무료 이용이 가능합니다.

4,000원

When the heat flux on the heating surface following changing heat condition in the boiling heat transfer system exceeds critical heat flux, the critical heat flux phenomenon is going over to immediately the film boiling area and then it is occurred the physical destruction phenomenon of various heat transfer systems. In order to maximize the safe operation and performance of the heat transfer system, it is essential to improve the CHF(Critical Heat Flux) of the system. Therefore, we have analysis the effect of improving CHF and characteristics of heat transfer following the nanoparticle coating thickness. As the results, copper nanocoating time are increased to CHF, and in case of nano-coatings are increased spray-deposited coating times more than in the fure water; copper nanopowder is increased up to 6.40%. The boiling heat transfer coefficients of the pure water are increased up to 5.79% respectively. Also, the contact angle is decreased and surface roughness is increased when nano-coating time is increasingly going up.

 

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