• 전기전자학회논문지
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• 제23권2호
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• pp.364-369
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• 2019

본 논문에서는 전기재해를 일으킬 수 있는 요소를 미리 제거하기 위해 전등부하, 전열부하, 동력부하를 대상으로 누설전류와 절연저항을 측정하여 분포비율과 누적비율을 비교하고 분석하여 보다 효과적이고 신뢰성 있는 누설전류 검출방법을 찾고자 하였다. 누설전류와 절연저항의 적합 비율 차이는 전열부하 32.5%, 전등부하 22.8%, 동력부하 2.2%의 순으로 나타났으며, 누설전류계가 낮은 적합 비율을 나타내었으며, 누설전류계는 측정방법에 따른 오차와 용량성 누설전류 및 영상전류가 포함되어 있기 때문으로 생각되었다.

• Composites Research
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• 제34권1호
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• pp.57-62
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• 2021

조선해양산업에서 친환경 선박 및 경량화 기자재에 관한 관심이 높아짐에 따라 파이프 등의 기자재에 복합재료를 적용하고 있다. 본 연구에서는 친환경 및 내열/난연 성능을 요구하는 파이프 단열재 커버에 적용하기 위해 친환경 소재인 바잘트 섬유강화 퓨란복합재료(BFC, basalt fiber reinforced furan composite)를 제조하였다. BFC 소재의 낮은 물성을 강화시키기 위해 후경화 조건의 최적화 연구를 수행하였고, BFC 소재의 기계적강도, 내열/난연 특성 강화, 친화경 특성에 대한 실험과 평가를 진행하였다. 최종적으로 연구 결과 조선해양기자재인 파이프 단열재 커버에 BFC 소재의 적용이 가능함을 확인하였다.

• 한국가스학회지
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• 제25권1호
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• pp.7-13
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• 2021

재액화 드럼은 과냉각된 LNG를 증발가스에 직접 분사하기 위해 상부에 스프레이 노즐을 설치하고, 기액 분리가 용이하도록 데미스터를 설치한 제품으로, 소형 재액화 설비의 재액화 효율을 높이기 위해 개발한 제품이다. 드럼의 상온 내압기밀시험에서는 설계압력의 1.5배 이상의 압력에서도 누설(Leak)이 없었으나, 단열성능시험 중 온도변화에 따른 수축/팽창으로 인해 볼트풀림 현상이 발생하였다. 제품의 지속적인 사용을 위해 플랜지 결합부의 단열 시공은 탈부착이 가능하도록 개발하였으며, 기존 단열과의 열침입량 비교 결과 드럼 내 유입 유량 대비 매우 미미함을 확인하였다.

• 한국안전학회지
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• 제25권3호
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• pp.78-82
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• 2010

This study is to test insulation mortar mixed with wastepaper and sawdust to find out its insulation performance. Therefore, wastepaper and sawdust have been added to normal mortar. They are analyzed for the above purpose using compressive strength and insulation performance. It is found that the more wastepaper and sawdust will be mixed, the lower heat conductivity will be taken. Wastepaper and sawdust mixture will be more 2.0% then the insulation mortar quality can be compatible with the 3rd kind of the standard. Optimal mixture for insulation will be wast paper:sawdust=4:6. Cohesive test of materials showed that test material has stronger than stand are $0.10N/mm^2$. It is satisfactory the test result showed a range of $0.12{\sim}0.15N/mm^2$ from the test result. Optimal mixture of wastepaper and sawdust have been found out from the study comprehensively, exclusive of the proportion of wastepaper:sawdust = 8:2. It is thought that standard of length deformation; 0.5% is reasonable. This means that deformation of mortar itself can be considered. But it is also Shown that water mixture has also been sharply changed at first flow test. Therefore, it is thought that absorbed water content in the material gave considerable effect to variation rate.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.28-29
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• 2015

Due to the big fire in Uijeongbu, the status of construction, fireproof materials and structural method were examined to prevent fire propagation through outside insulation parts of urban living homes. Through research and experiments, the following results were obtained. It was confirmed that outside heat-insulation wall method was used in a large number of urban living homes which were made of materials and structures spreading fire easily.Through experiments, it was revealed that lightweight plate material, as a fireproof material, can save the cost as well as the period of construction and obtain more than 30 minutes of evacuation time which is twice the maximum evacuation time.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.718-723
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• 2009

The purpose of this study is to present an in-site evaluation method for building insulation performance using Infra-red camera. The research contents of this study are to evaluate validity and suitability of building insulation defect survey using Infra-red camera for apartment housing with temperature & heat flow pattern analyze method. By establishing the in-site evaluation method building insulation performance using infra-red camera, it is expected that 1) building envelope repair market will be activated by using developed method in ESCO and remodeling companies, 2) the method developed in this research will contribute to reduce national energy consumption by promoting old building insulation remodeling.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.62-63
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• 2016

In addition to the waterproof sheet waterproof objectives that apply to the building roof it is being constructed, including a complex such as insulation performance, root-resistance. However, thermal insulation of the composite waterproofing sheet is an insulating effect a wide variety depending on the specific construction -specific, material and even the effect is this part of the test to the generation when insignificant compared to each other a number of roof insulation effect of the insulation composite waterproof sheet that is currently in effect analysis.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2010년도 춘계 학술논문 발표대회 1부
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• pp.37-39
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• 2010

In this study, with new office construction site of S Construction company as subject, to solve all the problems according to reduced hydration heat and temperature crack of mass concrete used mat foundation and placing time difference, low heat combination of coarse particle cement and fly-ash and setting time difference applied AE water reducing agent, and to prevent the early frost damage caused by low outdoor temperature, a heat insulation method using double bubble sheet was conducted. As a result, it was found that hydration heat and setting time difference was reduced by applying a low heat combination and setting time difference construction method, and that the high insulation capability of the double bubble sheet was able to not only prevent the early frost damage but also reduce temperature difference between the central part and the upper part of mass concrete.

• 대한기계학회논문집A
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• 제27권3호
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• pp.393-400
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• 2003

Excessive generation of BOG during the LNG transportation not only causes the severe financial loss but also leads to the unexpected disaster. Therefore, the carrier cargo insulating interior LNG should be carefully designed based upon an accurate heat transfer analysis. However. it is not simple to analyze heat transfer of LNG cargo, because it is in a complex insulation structure and LNG carrier experiences a complicated heat transfer according to various kinds of voyage conditions. In this paper, we carried out the transient finite element heat transfer analysis for a cargo of Mark-111 membrane-type LNG carrier during laden voyage, and we compared heat transfer rates between considering natural convection and considering conduction. For this goal, we developed a PCL program incorporating with a commercial MSC/NASTRAN FEM code.

• 한국태양에너지학회 논문집
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• 제24권4호
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• pp.45-53
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• 2004

In the summer, the irradiated solar heat gain through the roof has an effect on the thermal environment of the top floor units of apartment houses. This paper investigated the differences of the indoor air temperature and thermal comfort index between the top floor unit and the middle floor unit by measuring them at the sample houses. The purpose of this paper is to provide quantitative data about the irradiated solar heat gain during the summertime through the roof of an apartment house and these data to be the source to reevaluate the appropriate roof insulation efficiency. From this study, we obtained the brief results as follows. Indoor air temperature at the top floor unit is $1.2\sim2.2^{\circ}C$ higher than that of middle floor unit. The evaluation of the indoor thermal comfort index at each sample rooms reveals notable thermal differences between the two units. Top floor units need more cooling load during the summertime compared to middle floor units. Therefore, solutions to reduce solar Heat gain at top floor units to be considered.