• International Journal of Naval Architecture and Ocean Engineering
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• 제10권4호
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• pp.458-467
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• 2018

Efforts have been made in this paper to develop the measuring device for the insulation performance of full scale NO96 LNG CCS. The facility was designed to maintain environmental conditions which are similar to operation conditions of full scale LNG CCS. In the facility, the heat sink boundary was kept cryogenic temperature by cold chamber which contains liquefied nitrogen and heat source boundary was made by external case heated by natural convection. Heat Flow Meter method (HFM) was applied to this facility, hence Heat Flux Sensors (HFS) were attached to specimen. The equivalent thermal conductivity of full scale NO96 unit box was targeted to measure and PUF of same size was used for the calibration test. Additionally, the finite element analysis was carried out to check the performance of the developed test facility and experimental results were also compared with those predicted by the numerical method.

• 한국항공우주학회지
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• 제45권3호
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• pp.163-172
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• 2017

다공성 단열재는 탁월한 단열 효과로 단열공간을 최소화하여, 기존 단열재 대비 내부 공간을 활용할 수 있어 여러 산업 분야에서 사용되고 있다. 특히 높은 단열 효과뿐만 아니라 경량화가 요구되는 항공우주 산업분야에서는 이와 같은 다공성 단열재의 수요가 증가하고 있다. 본 논문에서는 다공성 단열재의 정확도가 높은 유효 열전도율 예측 모델을 새롭게 제안하고, 기존 예측 모델 및 시험 결과와 비교 검증하였다. 이를 위해, 기존 유효 열전도율 예측 모델에 대하여 문헌조사를 수행하였고, 다공성 단열재의 고체 부피율에 따른 열전도율 시험결과 값과 비교하였다. 또한 유효 열전도율 시험 결과와 비교하여 가장 높은 정확도를 가진 Zehner-Schlunder 모델 및 시험 결과 데이터를 기반으로 새로운 유효 열전도율 예측 모델을 정의하였으며, 시험 결과 데이터와 비교하여 기존 유효 열전도율 예측 모델보다 유사한 정확도를 나타내는 것을 확인하였다. 또한, 개선된 유효 열전도율 예측 모델을 적용하여 초고속 비행체 열방어구조의 과도 열전달 해석을 수행하였으며, 열전달 시험 결과와의 비교를 통해 예측 모델의 유효성을 확인하였다.

• 한국화재소방학회논문지
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• 제33권4호
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• pp.1-8
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• 2019

천장이나 배관에 설치된 보온재의 연소로 인해 화재가 확산되는 사례가 발생함에 따라 수계소화설비의 배관보온재는 난연재료 성능 이상의 것을 사용하고 있다. 배관보온재의 일부분을 시편으로 가공하여 난연성능을 평가하고 있지만 설치환경을 고려한 실규모시험을 통한 평가는 이루어지지 않고 있다. 본 연구에서는 국내에서 널리 사용되고 있는 발포폴리에틸렌폼 및 고무발포보온재를 실규모 시험기준인 ISO 20632에 따라 시험하고 유럽의 난연성능 분류 기준과 비교하였다. 배관보온재 재료별로 상이한 난연성능을 보였으며, 특히 발포폴리에틸렌폼보온재의 경우 시공방법에 따라 화재성장율 및 열방출율이 달라졌다. 화재발생 시 배관보온재로 인한 연소확산을 지연시키기 위해서는 설치하는 대상공간의 특성을 고려한 난연성능 적용이 필요하며, 시공 시 사용하는 접착제와 테이프 등 부자재의 난연성 또한 고려해야 함을 확인할 수 있었다.

• 한국해양공학회지
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• 제33권4호
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• pp.340-349
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• 2019

In the case of a fire accident on a ship or an offshore plant, the design of the bulkhead penetration piece must be verified via a fire test procedure (FTP), as specified by the Maritime Safety Committee (MSC). The purpose of this study is to verify both the numerical analysis results and the design specifications for penetration pieces that could be applied to the A60 class bulkhead division. In this study, the FTP was carried out in accordance with the test procedure prescribed in the MSC regulation. In order to review the fire resistance performance according to the material type, bulkhead penetration pieces for the FTP were made from brass, carbon steel for machine structures (S45C), and austenite stainless steel (SUS316). In addition, spray-type insulation and mechanical fastener-type insulation were applied to investigate the fire resistance performance according to the type of insulation. To verify the heat transfer numerical analysis results for the A60 class bulkhead penetrating piece from this test study, the design specifications of the penetrating piece material and the insulation type applicable to a ship and an offshore plant were identified.

• 한국의류산업학회지
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• 제17권4호
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• pp.657-665
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• 2015

This study evaluated the thermoregulatory properties of functional thermal underwear ('heating underwear') in markets using a thermal manikin and human wear trials. One ordinary thermal underwear (ORD) and two functional thermal underwear (HEAT1 and HEAT2; manufactured goods, HEAT1: moisture absorbing heat release mechanism, HEAT2: heat storage, release mechanism) were chosen. Thermo-physiological and subjective responses were evaluated at an air temperature of $5.0{\pm}0.5^{\circ}C$ and air humidity of $30{\pm}5%RH$ with five male subjects ($21.6{\pm}1.3yr$ in age, $178.0{\pm}5.9cm$ in height, $68.2{\pm}5.9kg$ in body mass). Experimental conditions consisted of four ensembles that included winter clothes (Control: no underwear, ORD, HEAT1, HEAT2). Water-vapor resistance was greater in fabric of HEAT1 than others. The results were: 1) Total thermal insulation (IT) using a thermal manikin were not greater for HEAT1 (0.860clo) and HEAT 2 (0.873clo) than for ORD (0.886clo). 2) There were no significant differences in rectal temperature, mean skin temperature, heart rate and total body mass loss between the four conditions. Microclimate clothing temperature on the back was greater for ORD than for HEAT1 and HEAT2. Subjects felt more comfortable with HEAT1 than for others at rest. HEAT2 was higher in microclimate humidity when compared to other conditions. The results suggest that thermoregulatory properties of 'heating underwear' in market did not differ from those of ordinary thermal underwear in terms of total thermal insulation and thermoregulatory responses in a cold environment.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.251-256
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• 2005

This study was performed the heat transportation ratio of three types of the following sandwich panel by KS F 2278(2003) ; Type ${\sharp}1$ : Carbon/epoxy Aluminum Honeycomb and Balsa Core Sandwich Panel(Thickness : 37mm), Type ${\sharp}2$ : Carbon/epoxy Aluminum Honeycomb Core Sandwich Panel(Thickness : 57mm), and Type ${\sharp}3$ : Carbon/epoxy Aluminum Honeycomb Core Sandwich Panel(Thickness : 37mm). Also was performed the heat transportation of next three types of the following sandwich panel by KS F2277(2002) ; Type ${\sharp}4$ and ${\sharp}5$ : 27mm, and 35mm thick-Aluminum Honeycomb Sandwich Panels, and Type ${\sharp}6$ : 27mm thick-Foaming Aluminum Sandwich Panel. It is the larger area between the skin and core, the heat transportation ratio is the higher, and when it is composed of the hybrid composite structure, good insulation property was shown.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.853-856
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• 2008

Windows have an great effect on annual building load because windows are the weakest parts of building envelope thermally. To reduce the consumption of building energy, the thermal performance of window has to be improved in first place. Therefore this research aims to make a quantitative analysis of the heating and cooling load according to the window thermal performance using the heat load simulation program. As a result of the simulation, annual heat load is down 38% according to the decrease of U-value of window, 1.00 W/$m^2K$. and annual heat load is up 10% according to the decrease of shading coefficient, 0.20. The annual load of the window with Low-E glass is 15% lower than the window with pair glass.

• 대한전기학회논문지
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• 제45권4호
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• pp.553-557
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• 1996

Heat cycle aging of insulating materials in large generator stator winding has been investigated using both on-line and off-line test methods. On this study, principally, off-line test against actual generator in service was carried out to acquire information about polarization index(PI) and dissipation factor, dissipation factor tip-up, maximum partial discharge for the purpose of remnant breakdown voltage and life assessment. It was found from the tests that both dissipation factor and maximum partial discharge decreased with the increase of operating hours and starting numbers. It was found from off-line tests that the remnant breakdown voltage had a strong relationship with both dissipation factor and maximum partial discharge the remnant breakdown voltage as a results of both operating hours and starting number and the nondestructive tests were proposed as parameters which can predict the remnant lifetime of insulating materials in large generator stator windings. (author). 8 refs., 8 figs., 2 tabs.

• 생물환경조절학회지
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• 제28권3호
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• pp.273-278
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• 2019

본 연구는 최근 신소재 단열재로 주목받고 있는 실리카 에어로겔을 이용하여 현재 사용되고 있는 다겹보온커튼의 단점을 보완하고 보온성을 유지 및 향상 시킬 수 있는 새로운 조합의 다겹보온커튼을 제작 하고, 보온 특성을 분석하고자 한다. 실험에 사용된 다겹보온커튼은 에어로겔이 함유된 부직포를 사용하여 총 6가지의 조합으로 제작하였으며 중량, 두께 및 온도변화에 따른 열유속을 측정하여 비교분석하였다. 실험결과 조합별 보온커튼의 열유속은 마트지+에어로겔 멜트블로운+발포 에어로겔 부직포+에어로겔 멜트블로운+마트지 조합이 가장 낮게 측정되었다. 열유속은 단위면적당 단위시간에 통과하는 열량을 뜻하며 수치가 높을수록 다겹보온커튼을 통과하는 열량이 많다는 것을 의미하여 보온성이 낮다고 판단할 수 있다. 조합형 보온커튼의 무게와 두께는 보온성과 상관이 높은 것으로 나타났으며, 특히 에어로겔 멜트블로운 부직포가 조합된 보온커튼이 같은 매수의 단열재가 조합된 보온커튼에 비해 보온성이 상대적으로 높게 나타났다. 하지만 에어로겔 멜트블로운 부직포는 내광성과 내구성이 약하고, 까다로운 제작공정과 에어로겔이 비산하는 문제점이 있다. 이러한 문제점을 해결하기 위하여 비교적 제작공정이 단순하고 보온성이 우수한 중공사 부직포와 에어로겔 발포 부직포를 조합한 다겹보온커튼이 실제 농가에서 사용하기에 적합하다고 판단된다.

• 한국태양에너지학회 논문집
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• 제35권1호
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• pp.61-68
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• 2015

The advanced counties effort to the supplement of the zero energy buildings for the global building energy saving. In the middle of the development of passive technology, the government has to effort to the energy saving of buildings by enhanced performance of the window thermal insulation. By the method of enhanced performance of window thermal insulation, the use of vacuum double glazing saves the energy consumption in building. This glazing has low U-value(heat transmission coefficient) than normal double glazing. The vacuum glazing enhanced thermal insulation performance by vacuum space of between the glass and glass. For this vacuum glazing, pillar maintain the space between glass and glass. But this structure cause the raising the heat transmission coefficient in pillar approaching glass. This study confirmed the U-value by the test method of thermal resistance for windows and doors. Also this study confirmed the variation of heat transmission coefficient by the structure of vacuum glazing. And this study measured the surface temperature of the vacuum glazing about pillar approaching glass and vacuum space in cool chamber and hot box. That result, this study confirmed U-value of $0.422W/m^2{\cdot}K$ of vacuum glazing. Also this study confirmed U-value of $0.300{\sim}0.422W/m^2{\cdot}K$ by various the structure of vacuum glazing. And this study confirmed the heat flow in pillar approaching glass.