• Title/Summary/Keyword: 단열재료

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Effects of the Moisture on the Overall Heat Transfer Through Heat Insulators Opaque Envelopes (불투명 외피의 열관류에서 단열재의 습도영향)

  • Lee, S.
    • Solar Energy
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    • v.18 no.3
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    • pp.63-69
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    • 1998
  • The heat conduction and the water vapour diffusion flow through heat insulators between hygroscopical moist building materials were measured by means of the plate method. It was found that the heat transport increases with a moisture motion occuring in the temperature drop. On his basis of simplified assumptions, the increase in the thermal conductivity was calculated from the rate of diffusion flow per unit area, which generally resulted in values inferior to the measured values. The Increase in the heat transport due to water vapour diffusion measured at a large-scale wall specimen was inferior to the one measured by means of the plate method by using a comparable arrangement of layers. The overall heat transfer caused by moisture motion is not a characteristic value of the material, but a property of the whole wall structure

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다공성 세라믹소재의 단열 효과 및 단열소재 연구 현황

  • Song, In-Hyeok;Park, Yeong-Jo;Yun, Hui-Suk;Hwang, Gi-Yeong;Choe, Sang-Gyu
    • 기계와재료
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    • v.22 no.4
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    • pp.6-20
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    • 2010
  • 현재 우리나라는 에너지 소비량의 97% 이상을 해외에 의존하고 있으며, 그 규모가 매년 증가하고 있는 실정이다. 이를 해소하기 위하여 다양한 시도가 이루어지고 있으며 이에 따른 관련 연구 분야의 정부 정책 지원도 증가하는 추세이다. 그러나 새로운 차세대 단열 소재의 개발을 통한 에너지 절감에 대한 노력은 아직 미흡한 상태이다. 본고에서는 이와 관련하여 에너지 효율 극대화 방안으로써, 기존의 단열 소재의 현황 및 향후 단열 소재의 연구방향을 다공질 세라믹(특히 에어로겔)을 중심으로 정리 기술함으로써 앞으로의 발전방향을 제시하고자 한다. 또한 이를 통하여 전체적인 다공성 무기질 단열 소재에 대한 이해를 높여 향후 친환경적이며, 에너지 효율적인 단열소재 연구 분야를 확립하는데 기여하고자 한다.

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A Study on the Insulation Properties of Ballon Pearlite and Pearlite (흑요소 펄라이트와 진주암 펄라이트의 단열 특성에 관한 연구)

  • Lee, Jae-Seong;Jeon, Chan-Ki;Park, Jong-Pil
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2016.11a
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    • pp.183-185
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    • 2016
  • 본 연구에서는 불연성 무기단열재 제조를 위해 재료의 치환으로 열전도율을 충족시켜 경량 무기단열재 개발을 위해 연구하였다. 단열재로도 쓰이지만 화단의 흙을 대신하여 쓰이는 펄라이트 2종류와 바인더를 배합하여 샘플 3개를 제작하였다. 3가지 샘플들을 완전건조 후 열전도 측정기인 HFM-435를 이용하여 열전도율을 측정하였다. 펄라이트와 흑요소 펄라이트 두가지 재료를 혼합하여 만든 총 3개의 샘플의 열전도율을 측정하여 열전도 효율이 좋은 재료를 사용하여 단열재를 제작하고 각 재료들의 단열 특성에 관하여 분석하였다.

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Comparative Study on the Thermal Insulation of Membrane LNG CCS by Heat Transfer Analysis (열전달 해석을 이용한 멤브레인형 LNG 화물창의 단열구조 성능비교)

  • Hwang, Se-Yun;Lee, Jang-Hyun
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.29 no.1
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    • pp.53-60
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    • 2016
  • This study discusses the thermal insulation capacity of variant of NO96 LNG (liquefied natural gas) cargo containment insulation system. Changing the insulation materials and the insulation layers of conventional GTT NO96 containment system, The thermal resistance and BOR(boil off rate) caused by the heat transfer between cryogenic and environmental temperature is discussed. Therefore, thermal analysis of LNG CCS(cargo containment system) is carried out to determine the insulation capabilities. Also, BOR is evaluated in terms of the total amount of heat invaded into CCS(cargo containment system). Variant of NO96 CCS such as NO96, NO96GW and NO96L3 membrane type during laden voyage is selected for the comparative study. Finite element model for heat transfer analysis is conducted by employing the equivalent thermal resistance model to simplify the complex insulation layers. Finally the results for each variant model are relatively compared and discussed to minimize the BOR.

Optimized Insulation Thickness of the Refrigerated Warehouse with Different Envelope Structures and Insulation Materials by L.C.C. Analysis (생애비용 분석을 통한 외벽 및 단열재료 종류별 냉동냉장창고 외피의 적정 단열두께 산정)

  • 강승희;구보경;황혜주;석호태;안홍섭;송승영
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.5
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    • pp.372-381
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    • 2003
  • This study aims to find out the optimized insulation thickness of refrigerated warehouse with different envelope structures (RC and PC wall) and insulation materials (urethane and icynene). Each of them is compared according to the thickness of insulation (100, 150, 200 mm/50 or 250 mm) and the temperature of cold storage room (0, -6, -15$^{\circ}C$). As results, it is proved to have the best economical efficiency in life cycle cost when PC wall with thickness of 100 mm (0 and -6$^{\circ}C$) and 150 m (-15$^{\circ}C$) urethane, respectively, are applied.

Compression Dynamic Performance of Glass Bubble/Epoxy Resin Adhesion (글라스버블/에폭시 수지 접착부의 극저온 압축 동적 성능)

  • Bae, Jin-Ho;Hwang, Byeong-Kwan;Lee, Jae-Myung
    • Composites Research
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    • v.32 no.2
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    • pp.90-95
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    • 2019
  • Sloshing impact loads on liquefied natural gas (LNG) carr iers are the main issue of damage to the insulation system in LNG cargo containment system (LNG CCS). The damage to the insulation system would be fatal in maintaining a temperature-savings environment in LNG CCS. The typical method is to enhance the insulation materials that can maintain a constant cryogenic temperature. Insulation materials consist of polyurethane foam and plywood, an adhesive for bonding these two materials. This study intends to improve the absorption energy of the material when the impact load is applied by creating a glass bubble/epoxy composite resin as part of the insulation. The experimental scenarios consider the effect of temperature ($20^{\circ}C$, $-163^{\circ}C$), glass bubble weight fraction in epoxy resin through free fall experiments. Experiments have shown that if the glass bubble additive reaches 20 wt.%, the cryogenic absorption energy is a maximum performance and that 0 wt.% has a maximum ambient absorption energy. However, the agglomeration has been occurred due to deterioration of the stirring performance if weight fraction was 20 wt.% and the result of 0 wt.% have been revealed that ambient absorption energy is significantly lower.

A Study on Thermal Conductivity of Inorganic Insulation Using Pearlite (펄라이트를 사용한 무기단열재의 열전도율 측정 연구)

  • Park, Jong-Pil;Jeon, Chan-Ki;Kim, Ju-Ho;Lee, Jae-Seong;Shim, Jae-Young
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2015.11a
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    • pp.138-140
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    • 2015
  • 건축물에서 단열재는 일정한 온도를 유지하도록 하려는 부분의 바깥쪽을 피복하여 외부로의 열손실이나 열의 유입을 적게 하기 위한 재료이다. 단열재는 소재(素材) 자체의 열전도율(熱傳導率)이 작은 것이 바람직하나, 대부분 열전도율이 그다지 작지 않다. 그러므로 대개의 경우 열전도율을 작게 하기 위해서 다공질(多孔質)이 되도록 만들어 기공(氣孔) 속의 공기의 단열성을 이용한다. 일반적으로 재료의 밀도가 크면 열전도율 값이 크게 되는 경향이 있다. 이에 본 연구에서는 경량골재인 펄라이트의 입자 크기별 열전도율을 측정하여 단열재로서 사용여부를 판단하고자 한다.

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A Study on the External Insulation of Missile Surface (미사일 외면의 열 방호 단열재 연구)

  • Park, Byeong-Yeol;Ryoo, Moon-Sam
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.3
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    • pp.53-59
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    • 2006
  • This paper presents the IR-Lamp test results of evaluating heat protection performance and measuring of mechanical/thermal properties in the heat protection material of missile external surface. The results showed that increasing the contents of microballoons improved the heat protection performance, but the mechanical properties were deteriorated. Among the kinds of microballoons, Epoxy/Phenolic Microballoons mixture showed the best mechanical properties and low thermal conductivity. Epoxy/Cork mixture showed the best heat protection in the IR-Lamp test, though it has low mechanical properties and high thermal conductivity.

Development of Eco-friendly Basalt Fiber-reinforced Furan-based Composite Material with Improved Fire and Flame Retardants for Shipbuilding and Offshore Pipe Insulation Cover (조선해양 파이프 단열재 커버 적용을 위한 내화/난연 성능을 갖는 친환경 바잘트섬유 강화 퓨란계 복합재료 개발 연구)

  • Kwon, Dong-Jun;Seo, Hyoung-Seock
    • Composites Research
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    • v.34 no.1
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    • pp.57-62
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    • 2021
  • As interest in the eco-friendly ships and lightweight equipment is increasing in the shipbuilding and marine industry, composite materials are applied to equipment such as pipes. In this study, a basalt fiber reinforced furan composite (BFC), an eco-friendly material, was manufactured to apply the pipe insulation cover that requires environment-friendly and heat/flame retardant performance. An optimization study of post-curing conditions of BFC was conducted, and experiments and analysis were performed on mechanical strength, heat/flame retardant properties, and affinity properties. Finally, as a result of the study BFC material is proved to be a good candidate to apply pipe insulation cover.

제품의 종류와 설계$\cdot$시공시 주의점을 중심으로 - IMF시대 단열과 방습에 대한 활용 테크닉

  • 전국보일러설비협회
    • 보일러설비
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    • s.52
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    • pp.78-89
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    • 1998
  • 건축물의 성에너지화와 고내구화, 거주공간의 쾌적성 향상을 꾀하고 건축이 지구환경 보전에 기여하기 위해서는 건물의 단열과 방습을 주도하는 기밀화는 빼놓을 수 없는 관건이다. 따라서 여기에서는 주로 성에너지성이 높은 주택을 설계$\cdot$시공하는 경우에 필요한 단열과 방습의 종류와 특징, 각 재료의 설계, 시공상의 포인트에 대해 설명한다.

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