극지(남극 또는 북극권)해역을 운항하는 선박과 해양구조물에 설치되 는 탄소나노튜브 기반의 면상발열체를 부착 및 융합하여 선박운항 및 조 정 시 안정성을 확보하기 위한 동결방지 장치에 관한 것으로, 영하 ?6 0℃ 극한의 외기 온도에서도 선박의 안전운항과 해양플랜트 및 구조물에 서의 안락한 거주생활에 안전성이 확보되어 구조물의 운영에 한결 편히 사용할 수 있음을 특징으로 하고 있다. 본 연구에서는 기존에 일반적으로 사용하던 금속 소재를 이용한 열선 케이블을 대체하여 초경량 및 박판형태의 탄소나노튜브 소재를 적용하여 용이하게 시공될 수 있으며, 기존의 일차원적 교차 열선방식 형태가 아 닌 면상의 발열체를 이용함으로써 에너지 효율을 높이고 단위체적당 발 열면적을 극대화시켜 초저온 극지 해상에서의 동결방지 장치로 신개념의 발열체 적용기술이라고 할 수 있으며 극지운항선박(또는 해양구조물 적 용에 관한 기초 자료로 활용하고자 하며, 탄소나노튜브 소재로 보강된 복합체는 인장강도 및 탄성, 그리고 경도가 매우 높은 정도까지 높아질 수 있음을 보여주고 있으나, 아직까지 대량으로 탄소나노튜브 소재 강화 금속복합체의 제조에는 적합하지 않다고 볼 수 있다. 따라서 본 논문은 이러한 문제점들을 보완하기 위하여 3-Roll Mill System을 통해 분산과정을 거치게 되면 액상형태의 발열페이스트를 생 성할 수 있으며 탄소나노튜브의 변화에 따른 인장강도, 전기 전도성 및 열전도성을 직접 분산 처리하는 방법을 적용하였고, 제작된 시편에 대하 여 극지해양구조물 거주구역에 설치되는 일체식 화장실 바닥면에 적용하 고자 시간대별 온도변화와 온도 상승 시 전기 소모량을 측정하여 분석한 결과 다음과 같은 결론을 얻었다. 1. 탄소나노튜브(CNT) 시료에 대한 외관 검사를 실시한 결과 크랙이 나, 변색, 변형, 부식 등의 외관 변화는 발견할 수 없었으며 열효율과 구 조 등을 분석 및 고찰하였을 때, 적합한 재질인 것으로 판단되었다. 2. 저온 챔버에 시편을 넣고 결선 및 예비동작을 확인하고 저온 챔버 온도를 0℃로 설정하였으며, 저온 챔버 내 온도가 0℃로 안전화 후 시편 표면 온도조절기를 통해 발열동작, 시편 표면온도가 22℃도달 후 180분 간 동작을 유지 전체 온도 데이터를 저장, 시험 종료 시까지 평균온도를 유지하였을 때 성능 면에서 가장 적합하다는 것을 알 수 있었다. 3. 케이블 열선 방식보다 탄소나노튜브의 면상발열체가 기준 온도에서 소비전력과 최고온도를 비교 분석한 결과, 동일 발열면적으로 환산했을 때 탄소나노튜브가 소비전력이 약 47% 절감되는 것을 알 수 있었다. 4. 표면저항 분석은 시료에 전류를 보내면 두 지점간의 전압을 측정하 고 옴의 범칙에 따라 저항을 측정하였으며, 저항은 선 저항이기 때문에 보정계수를 적용하면 면 저항으로 환산됨을 알 수 있었다. 5. 면상발열체를 제작하여 일체식 화장실 바닥재에 설치하여 발열 테 스트, 온도분포를 실험하여 분석한 결과, 열선이 설치된 화장실보다 성능 이 우수함을 확인하였다.
Winterization device that secures stability during ship operation and adjustment by attaching and fusing carbon nano tube-based surface heating elements installed in ships and marine structures operating in polar (Antarctic or Arctic Circle) waters Is characterized by being able to be used conveniently for the operation of the structure by securing safety in the safe operation of ships and comfortable living in offshore plants and structures even at extreme temperatures of minus -60℃. In this study, it can be easily constructed by applying ultra-light and thin-walled carbon nanotube materials by replacing heat tracing cables using metal materials that were used in the past. By using a non-planar heating element, energy efficiency is increased and the heating area per unit volume is maximized, and a new concept of heating element application technology is dealt with as a cryopreservation device in the low temperature polar sea. We intend to use this technology as a basic data for the application of Arctic ships or Offshore structures, and it has been shown that composites reinforced with carbon nanotube materials can increase tensile strength, elasticity, and hardness to a very high degree. Therefore, it can be considered that it is not suitable for the production of a carbon nanotube-reinforced metal composite. Therefore, in order to compensate for these problems, this paper can generate liquid-type heat generating paste through the 3-Roll Mill System and directly disperse tensile strength, electrical conductivity, and thermal conductivity due to changes in carbon nanotubes. In order to apply the fabricated specimen to the unit toilet floor surface installed in the living quarter of the polar marine structure, the results of the analysis by measuring the electricity consumption during the temperature change and the temperature rise by time were obtained. 1. As a result of visual inspection of the carbon nanotube(CNT) sample, cracks, discoloration, deformation, corrosion, and other appearance changes were not found, and it was judged to be a suitable material when analyzing and considering thermal efficiency and structure. Became. 2. We put the specimen in low temperature chamber, check the wiring and preliminary operation, set low temperature chamber temperature to 0℃, set the temperature in low temperature chamber to 0℃, and heat it through the specimen surface temperature controller, and the specimen surface temperature After reaching 22℃, the operation was maintained for 180 minutes, and it was found that it is most suitable in terms of performance when the entire temperature data is stored and the average temperature is maintained until the end of the test. 3. Compared to the cable heating wire method, the power consumption compared with the reference temperature of the carbon nanotube planar heating element was compared with the maximum temperature. When converted to the same heating area, it was found that the power consumption was reduced by about 47%. 4. Surface resistance analysis measured the voltage according to Ohm''s rule by measuring the voltage between two points when a current was sent to the sample (resistance). Since the resistance is a line resistance, it is converted into a sheet resistance when a correction factor is applied. 5. As a preliminary test for this test, the experimental conditions for predicting the results were analyzed, specimen preparation, exothermic test, and temperature distribution test were performed. It was confirmed that the performance of the surface heating element was superior to that of a toilet equipped with a heating trace.
Ⅰ. 서론 ············································································································· 11. 연구의 목적 ······························································································· 12. 연구의 방법 및 범위 ··············································································· 33. 논문의 구성 ······························································································· 7Ⅱ. 탄소나노튜브의 개념과 적용 ····························································· 91. 탄소나노튜브의 개념 ··············································································· 92. 탄소나노튜브의 구조 ··············································································· 93. 탄소나노튜브의 합성방법 ····································································· 204. 탄소나노튜브 소재의 중간재 기술 ····················································· 305. 탄소나노튜브를 이용한 극지해양구조물 ··········································· 446. 극지해양구조물의 해양산업규격 적용 ··············································· 54Ⅲ. 실험장치 및 방법 ················································································· 581. 실험장치 ··································································································· 582. 실험방법 ····································································································· 60Ⅳ. 결과 및 고찰 ·························································································· 791. 온도특성 ································································································· 792. 표면저항 ··································································································· 873. 성능특성 ··································································································· 88Ⅴ. 결론 ············································································································ 93참고문헌 ········································································································ 94Abstract ········································································································ 97