맞음 정도 및 진동 깊이에 따른 남성 조끼의 보온성 변화 분석

이효정(Hyojeong Lee),엄란이(Ran-i Eom),정연희(Yeonhee Jeong),이예진(Yejin Lee) 한국생활환경학회 2014 한국생활환경학회지 Vol.21 No.2

Thermal insulation of man"s vest was investigated according to fit and pattern design. Cotton was used as an experimental material, and four different kinds of vest were designed with different ease of pattern and armhole depth. Thermal insulation and clothing surface temperature were measured by a thermal manikin and infrared thermography respectively. Air volume of the vest was estimated from a virtual clothing simulation and 3D analysis program. The correlation of local thermal insulation and air volume was investigated for each part of the upper torso: shoulder, chest, back and stomach. In addition, the effect of armhole depth on the thermal insulation was also analysed. As a result, it was found that the total thermal insulation of the three vests are similar except for one case. Among each part, the thermal insulation of shoulder and stomach area makes a big impact on total thermal insulation. For local insulation, air volume and armhole shape are important for the shoulder area, while air volume of the stomach is solely important for the stomach area. For chest and back area, the amount of air volume has little influence on the thermal insulation comparing to shoulder and stomach area. Furthermore, the contribution of armhole depth and area on the thermal insulation is different for each part. The results showed that pattern design brings a corresponding change in air volume of a specific part of the body, and the contribution of the air volume on local thermal insulation can be altered in various ways even though total thermal insulation of the clothing is similar.

열반사 단열재의 단열성능 평가방법에 대한 고찰

김진희,안종권,김준태 대한건축학회 2022 대한건축학회논문집 Vol.38 No.4

In the last few years, heat-reflective insulation materials have been supplied in the form of polyethylene (PE) foam covered by aluminum films, which enhances constructability compared to typical aluminum sheets and secures air layers. As composite materials comprised of aluminum films, PE foam, and air layers, they are easily distinguishable from organic insulation materials, beading insulation materials (EPS), extruded polystyrene insulation boards (XPS), rigid polyurethane foam (PUR, PIR), and inorganic insulation such as glass wool and mineral wool. Due to the use of low-emissivity materials in heat-reflective insulation and the formation of air layers, the assessment of insulation performance factoring radiant heat has been an issue over the years. Testing standards have yet to be established for heat-reflective insulation. Thermal performance is evaluated based on the criteria for evaluation of thermal transmittance of walls and roofs containing heat-reflective insulation (KS F 2277) for composites instead of individual materials. Further verification is required as this method of evaluating thermal performance of heat-reflective insulation is different from that of existing organic and inorganic insulation materials. Against this backdrop, this study reviewed the status of heat-reflective insulation in Korea and overseas, and examined methods used to evaluate their insulation performance. 열반사 단열재는 저방사 재료를 포함하고 있고 공기층을 형성하고 있어 복사열 차단효과에 따른 단열성능 규명에 대한 문제가 최근 몇 년 동안 제기되고 있다. 특히, 열반사 단열재를 위한 시험표준의 부재로 열반사 단열재가 포함된 벽체 및 지붕의 열관류율 시험 기준(KS F 2277)에 따른 해당 제품의 단열성능에 대한 신뢰성 문제가 지속적으로 제기되고 있다. 이러한 배경으로, 본 연구에서는 국내·외 열반사 단열재의 현황을 조사하고, 열반사 단열재 제품의 단열성능 및 단열성능 평가 방법론에 대해 고찰하였다.

고온초전도 케이블의 절연파괴 특성에 미치는 Butt gap의 영향

곽동순,김영석,김해종,조전욱,김상현 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.3

For an electrical insulation design of HTS cable, it is important to understand the dielectric characteristics of insulation materials in L$N_2$ and the insulation type. Generally, the electrical insulation of HTS Cable is classified into two types of the composite insulation and solid insulation type. In this research, we selected the insulation paper/L$N_2$ composite insulation type for the electric insulation of a HTS cable, and studied electric insulation characteristics of synthetic Laminated Polypropylene Paper(LPP) in liquid nitrogen(L$N_2$) for the application to high temperature superconducting(HTS) cable. Furthermore, we compared the breakdown characteristics of the butt gap and bended mini-model cable. It is necessary to understand the winding parameter of insulation paper/LN2 composite insulation.

다층형 단열재의 구성 형식에 따른 강도 특성 연구

류화성 ( Ryu Hwa-sung ),신상헌 ( Shin Sang-heon ),송성용 ( Song Sung-yong ),김득모 ( Kim Deuck Mo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1

As part of the recent low-energy policy, insulation standards for buildings are increasing every year. In addition, the conventional styrofoam heat insulation material has a problem in that the thickness of the heat insulation material to achieve the standard heat transmission rate is rapidly increased. Although the risk of spreading the structure vulnerable to fire due to insufficient spacing between buildings due to thickened insulation is increasing, the high cost of high efficiency insulation is difficult to solve. On the other hand, it is known that the method to be used as a formwork using insulation is excellent in cost reduction effect by reducing the amount of formwork used and simplifying the subsequent insulation work. The purpose of this study is to evaluate the strength characteristics of multi - layered insulation materials with appropriate strength by reducing the thickness of the insulation by appropriately combining high performance phenolic foam insulation and styrofoam insulation.

저방사 박막 복합 단열재 설계인자에 따른 벽체 단열성능예측에 관한 연구

서준식,홍승훈,노상태 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.5

This increase in input per unit area due to the strengthening of energy design standards appears to accelerate the growth of insulation market. Therefore, in Korea, the construction of low radiation thin film composite insulation has been increasing in order to improve the thermal resistance of the air cavity and to reduce the thickness of the insulation. As building energy-saving designs become more popular in Korea (notification of Ministry of Land, Infrastructure and Transport), test reports of insulation tests on windows and walls must be approved for new construction. However, it is difficult to measure the thermal insulation performance of low-emissivity insulation only, and the insulation performance of low-emissivity insulation only is not satisfied because it does not satisfy the indices required for thermal insulation performance such as the energy performance index of the energy saving plan. Therefore, in order to derive reference data of low emissivity insulation, this study analyzed and measured the change of insulation performance according to the design factor of low emissivity insulation wall through numerical analysis and model test.

표면 강화 시멘트계 결로방지 단열재의 단열 및 시공성능 분석

김혜연 대한건축학회 2022 대한건축학회논문집 Vol.38 No.8

The purpose of this study is to analyze the insulation performance and construction performance of the surface-enhanced cement-based insulation for condensation prevention(‘the developed composite insulation’) developed to solve the problems of the insulation for condensation prevention constructed as substrate according to the finishing method. In order to analyze the insulation performance, a thermal conductivity test of the material and a heat transfer analysis of the part of apartment plane were performed. In order to analyze the construction performance, experiments were designed and conducted according to the finishing method. As a result of the experiment, it was confirmed that unlike the insulating mortar used on the tile substrate, the developed composite insulation has legal standard insulation performance. It was confirmed that the developed composite insulation has adhesion strength and construction stability to tiles. It was confirmed that the developed composite insulation also had adhesion strength of the wallpaper/putty and the adhesion strength against twisting. In addition, it was confirmed that the developed composite insulation has waterproof capacity and construction stability. 본 연구에서는 마감방식에 따라 결로방지 단열재가 가진 문제점을 해결하기 위해 개발된 표면강화 시멘트계 결로방지 단열재의 단열성능 및 여러 마감재의 바탕면으로서 시공성능을 분석하는 것을 목적으로 한다. 단열성능 분석을 위해 자재의 열전도율 시험과 전열해석을 실시하였으며, 시공성능을 분석하기 위해 마감방식에 따라 실험을 설계하고 수행하였다. 실험 결과, 단열 몰탈과 달리 개발 단열재는 법적 열전도율 기준을 만족하며, 개발 단열재는 타일, 도배지/퍼티, 방수 시공 바탕면으로서 필요한 시공성능을 확보하는 것으로 나타났다.

국내 섬유질 단열재의 내화성능에 관한 연구

권영철(Kwon Young-Cheol),황정하(Hwang Jung-Ha),유형규(Yu Hyung-Kyu) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.4

The fire resistance of thermal insulation and interior finishing materials is recently much emphasized after the fire accident at the Icheon Cold Store in January 2008. Three kinds of thermal insulation are used in buildings. They are Organic, Non-organic and cellulosic insulation. Organic insulation such as polystyrene foam board and urethane foam has high thermal resistance but it has no fire resistance. While non-organic insulation such as rockwool and glassfiber has high fire resistance, it has lower thermal resistance than organic insulation. Cellulose insulation is primarily manufactured from recycled newsprint or cardboard using shredders and fiberizers. Despite of its environmental friendliness and high thermal resistivity, its domestic use has not much increased bemuse of the prejudice that paper can easily bum. However, the cellulose insulation as a product is about 80 wt.% cellulosic fiber and 20 wt.% chemicals, most of which are fire retardants such as boric acid and ammonium sulfate. It is required to secure its fire safety for more consumption as a building insulation in Korea. Therefore, this study investigates the fire resistance of Korean cellulose insulation according to the rote of fire retardant and finally presents the optimum rote of fire retardant in cellulose as building insulation. The fire safety test was conducted according to the ASTM C 1485-00. The test results indicate that above 18 wt% of fire retardant is necessary to secure the fire safety of cellulose insulation.

SOFC용 고온 적층 단열재의 해석적 고찰

최종균,황승식,최규홍 한국수소및신에너지학회 2019 한국수소 및 신에너지학회논문집 Vol.30 No.6

This study was conducted to develop insulation for solid oxide fuel cell (SOFC). The developed insulation is based on the lamination technology and the radiation shielding technology of the satellite insulation. The insulation material is consisting of insulation material for conduction resistance, spacer, and radiation shielding material. The experimental apparatus consisting vacuum bell jar, pump, heater and temperature recording device has developed to verify the performance of the insulation. The experimental values ​​were used as reference data for the modeling development. In this paper, heat transfer is assumed to be one- dimensional phenomena for the prediction of insulation performance and internal temperature distribution in high temperature region of SOFC. The developed model was used to compare the performance difference of insulation types according to composition materials. The analysis result shows that the insulation including spacer and radiation shielding has better heat insulation performance than other cases. In this study, the thickness reduction effect of about 20% was shown compared to the insulation including only conductive material. It is noted that the radiant shielding material should be carefully selected for durability, because SOFC insulation should be used for a long time at high temperature.

Low-E 단열재 적용에 따른 단열두께 절감 효과 분석

권영철(Kwon Young-Cheol),이재혁(Lee Jae-Hyuk),최원기(Choi Won-Ki) 한국건축친환경설비학회 2010 한국건축친환경설비학회 논문집 Vol.4 No.4

Great concern on the building energy saving and reinforced governmental energy policy have resulted in the revision of building energy regulation. To meet the energy saving requirement, buildings should be insulated much more thicker or super-insulation should be applied. In these respects, this study presents a new insulating method using low emissive and high reflective Low-E insulation through the comparative analysis of thermal performance of existing resistive insulation and Low-E insulation. To analyze those thermal performances. A unit of an apartment building was selected to calculate its thermal load depending on the alternative insulations. TRNSYS program was used for the simulation, and the results of the simulation are as follows. It was indicated that Low-E insulation could achieve the most excellent insulating performance with the thinnest structure. In case of reinforced super-insulation, the existing resistive insulation should be used as thick as 250 mm, but Low-E insulation could meet the same performance with half thickness of 120 mm. Thanks to the reduced thickness of insulation, Low-E insulation has the advantage in applying to high-rise buildings and it is believed to gather the interests of construction companies which have difficulty in solving the strick insulating problem. Based on the results of the simulation, in-situ tests on the thermal performance and workability will be followed to verify the excellence of Low-E insulation.

100μm급 글라스 버블 혼입 시멘트계 초경량 무기 단열재의 단열 및 난연특성

손배근(Bae-Geun Son),송훈(Hun Song) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.4

건축물의 에너지 절약기준이 강화되면서 외단열 공법의 적용과 단열재 두께가 증가하고 있다. 유기계 단열재는 시공성, 경제성 등 시공비용 절감 효과와 뛰어난 단열성능을 가지고 있다. 하지만, 유기계 단열재 특성상 열에 매우 취약하므로 화재 발생시 급격한 화재확산과 유독가스 발생으로 심각한 피해가 발생한다. 무기계 단열재는 기본적으로 불연성능을 가지나 무겁고 유기계 단열재에 비해 단열성능이 떨어진다. 글라스 버블은 소다 라임 보로실리케이트 유리로 밀도가 매우 낮고, 내부가 비어 있는 구형의 입자로 볼베어링 효과로 유동성이 개선된다. 또한, 무기계 단열재에 혼입하여 사용할 경우 밀도와 단열성능이 개선된다. 본 연구는 시멘트계 재료와 글라스 버블을 혼합하여 무기 단열재를 제조하였고 단열, 난연 및 불연성능을 평가하였다. 연구 결과, 글라스 버블의 혼입률이 증가할수록 열린 기공을 형성하고 있으나, 기공 및 셀 벽에 분포됨에 따라 충분한 단열성능을 보인다. 또한, 글라스 버블의 혼입률은 10% 이하로 사용하는 것이 바람직하다. Energy saving standard for buildings are strengthened, the application of exterior insulation finishing system and thickness of insulation materials are increasing. Most buildings with exterior insulation finishing system is applied organic insulating material. Organic insulating material have workability, economic feasibility, reduction in construction cost, and excellent thermal insulation performance. However, Organic insulating material is very vulnerable to heat, so when a fire occurs, rapid fire spread and toxic gas are generated, causing many casualties. Inorganic insulating material can be non-combustible performance, but it is heavy and has low thermal insulation performance. Mineral wool has higher thermal insulation performance than other types of inorganic insulating material, but mineral wool is disadvantageous to workability and vulnerable to moisture. Glass bubble are highly resistant to water and chemically stable substances. In addition, the density of the glass bubble is very low and the particles are spherical, fluidity is improved by the ball bearing effect. Glass bubbles can be used with cement-based inorganic insulating material to improve the weight and thermal insulation performance of cement-based inorganic insulation. This study produced a inorganic insulating materials were manufactured using cement-based materials and glass bubble. In order to evaluate the insulation performance and flame retardant performance of cement-based super light-weight inorganic insulating materials using with glass bubble, insulation performance or flame retardant and non-combustible performance were evaluated after manufacturing insulating materials using micro cement and two types of glass bubbles. From the test result, Increasing the mixing ratio of glass bubbles improved the insulation performance of cement-based super light-weight inorganic insulating materials, and when the mixing ratio of glass bubbles was 10%, it showed sufficient flame retardant and non-combustible performance.