• Title/Summary/Keyword: Anti-icing technique

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A Study on Anti-Icing Technique for Ballast Water of Icebreaking Vessels Operating in Ice-Covered Water (극지운항용 빙해선박의 밸러스트 수 결빙방지 기법 연구)

  • Jeong, Seong-Yeob;Lee, Chun-Ju;Cho, Seong-Rak
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.1
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    • pp.93-97
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    • 2011
  • When freezing is present on ballast water, it can impose additional loads on the hull and effect on stabilization of ship. The anti-icing techniques of ballast water, therefore, are key criteria for ship safety. The existing anti-icing techniques of ballast tank are hull heating, water circulation and air bubble system etc. In this research, anti-icing performance tests for the ballast water using micro-bubble system and sea water circulation system have been carried out at two temperature conditions($-10^{\circ}C$ and $-25^{\circ}C$). Ambient temperature, sea water temperature and temperature of the inner parts of the ballast tank are measured and also ballast water conditions are checked during the model test. The applied anti-icing techniques of ballast water, such as micro-bubble system and sea water circulation system show good performance in the low temperature conditions.

A Study on Anti-Icing Technique for Weather-Tight Door of Ice-Strengthened Vessels (내빙선박용 풍우밀 문의 결빙방지 기법 연구)

  • Jeong, Seong-Yeob;Chun, Eun-Ji;Cho, Seong-Rak;Lee, Chun-Ju
    • Journal of the Society of Naval Architects of Korea
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    • v.48 no.6
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    • pp.575-580
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    • 2011
  • Icing problem of ice-strengthened vessels is an important issue when operating in low temperature environment and it can cause damage to deck machineries and emergency equipments. Many ice-strengthened vessels have since been constructed and operated in accordance with the ice class rules such as Det Norske Veritas (DNV), Russian Maritime Register of Shipping (RS), American Bureau of Shipping (ABS) and so on. Therefore winterization is defined as the preparation of a ship for safe operation. In this research, anti-icing performance tests of weather-tight door have been carried out at various temperature conditions($5^{\circ}C$, $-10^{\circ}C$, $-20^{\circ}C$, $-30^{\circ}C$, $-40^{\circ}C$) in the low temperature cold room facility and then, ambient temperature, specimen temperature, electric current and temperature of heating cable were measured during the test operations. This research describes the construction guidelines of weather-tight door based on anti-icing test results to apply to the full-scale vessels.

A Study on the Anti-lcing Performance Evaluation and Design Guide for Weather-Tight Door of the Vessels Operating in Cold Region (빙해선박 풍우밀문의 결빙방지 성능평가 및 설계기준에 관한 연구)

  • Seo, Young-Kyo;Jung, Young-Jun
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.6
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    • pp.450-457
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    • 2013
  • For the design guide of a vessel operating in cold region, numerical analysis was carried out to evaluate the weather-tight door which installed the heating cables by using ANSYS 13.0 Transient Thermal. The numerical analysis was performed by considering Advection-Diffusion equation. This study based on the experimental results of 'A study on Anti-Icing Technique for Weather-Tight Door of Ice-Strengthened Vessels'(Jeong, et al., 2011a) in KIOST. For validation of the numerical analysis results, the cold chamber experimental data measured by the heat sensors in certain location of the weather-tight door was used. The external environmental temperature which varies from $5^{\circ}C$ to $-55^{\circ}C$ was considered in numerical analysis. Also three different heating cables which have the heat capacity of 33W/m, 45W/m and 66W/m were adapted for the design parameters to be the most efficient and guidelines for anti-icing design of the weather tight door.

Evaluation of Adhesion, Hydrophobicity and Color Gamut of Nanoparticle embedded Polyurethane Topcoat for Aircraft with 3 Different Nanoparticles (항공기용 3종류 나노입자들로 함침된 폴리우레탄 탑코트의 접착성, 소수성 및 색재현성 특성평가)

  • Kim, Jong-Hyun;Kwon, Dong-Jun;Park, Joung-Man
    • Journal of Adhesion and Interface
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    • v.22 no.1
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    • pp.16-21
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    • 2021
  • In the aircraft industry, anti- and de-icing are one of very important techniques for the safety. The anti-icing technique had not been studied while de-icing technique had been not only researched enough but applied to aircraft industry. In this work, surface roughness and energies of polyurethane (PU) topcoat were controlled with 3 different nanoparticles which was coated to PU topcoat. It was evaluated via static contact angle using distilled water. The adhesion property of 3 nanoparticles was evaluated directly using adhesion pull-off test. The color gamut of nanoparticle coated PU topcoat was also evaluated with 3 different nanoparticles. It was determined using RGB color degree variation between neat PU topcoat and coated nanoparticle. Finally, the optimized nanoparticle was determined to manufacture hydrophobic surface and to maintain color of neat PU topcoat for the aircraft.