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축열건축자재 적용을 위한 Hexadecane/xGnP SSPCM 제조 및 열적특성
김석환(Kim, Sug-hwan),정수광(Jeong, Su-Gwang),임재한(Lim, Jae-Han),김수민(Kim, Su-min) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.1
Hexadecane and exfoliated graphite nanoplate (xGnP)composite was prepared as a shape-stabilized phase change material (SSPCM) in a vacuum to develope thermal energy storage. The Hexadecane as an organic phase change material (PCM) is very stable against phase separation of PCM and has a melting point at 18℃ that is under the thermally comfortable temperature range in buildings. The xGnP is a porous carbon nanotube material with high thermal conductivity. Scanning electron microscope (SEM) and Fourier transformation infrared spectrophotometer (FT-IR)were used to confirm the chemical and physical stability of Hexadecane/xGnP SSPCM. In addition, thermal properties were determined by Deferential scanning calorimeter(DSC) and Thermogravimetric analysis (TGA). The specific heat of Hexadecane/xGnPSSPCM was 10.0J/g·K at 21.8℃. The melting temperature range of melting and freezing were found to be 16-25℃ and 17-12℃. At this time, the laten heats of melting and freezing were 96.4J/g and 94.8J/g. The Hexadecane was impregnated into xGnP as much about 48.8% of Hexadecane/xGnP SSPCM’s mass fraction.
목조건축물 구조부재의 열전도율에 따른 건물외피의 단열 성능
김석환 ( Sug Hwan Kim ),유슬기 ( Seul Gi Yu ),서정기 ( Jung Ki Seo ),김수민 ( Su Min Kim ) 한국목재공학회 2013 목재공학 Vol.41 No.6
국내에서 주로 사용되고 있는 건물에너지 성능평가 시뮬레이션 마다 상이한 재료의 열전도율로 평가 되고 있음이 파악되었다. 시뮬레이션을 통한 정확한 건물에너지부하를 평가하기 위하여, 각 시뮬레이션에서 목조건축물의 스터드로 사용되고 있는 목재의 열전도율을 확인하고, 이에 따른 벽체의 열관류율과 부재 접합부위에서의 선형열교 차이를 연구하였다. 각 시뮬레이션은 동일 수종에 대해 상이한 열전도율을 채택 후, 각 시뮬레이션에서추출한 열전도율 간의 차이가 가장 상이한 소나무의 열전도율을 스터드에 적용하였다. 시뮬레이션 간 지붕, 벽체, 지면 슬래브의 열관류율 중 최대오차는 0.023 W/m2·K이었으며, 지붕의 서까래 접합부, 지붕-벽체 접합부, 지면슬래브-벽체 접합부 중 최대 선형열교 오차는 0.025 W/m·K이었다. 또한, HEAT2 정상상태전열해석 프로그램을 활용하여 선형열교 및 벽체의 온도변화에 대한 전열해석 이미지를 분석하였다. 구조체에 온도 분포를 선으로 표시하여 단열이 부족한 곳에서는 온도선이 급격하게 변하는 것이 확인되었고, 온도선이 급격하게 변하는 부위에서는 다른 곳보다 온도가 낮으며, 다른 구조체 부분보다 더 많은 열류가 손실됨이 확인되었다. Building energy simulations which are mainly used in Korea have evaluated the building energy performance with the different thermal conductivity of construction materials. In order to evaluate the energy consumption accurately, the difference in thermal conductivity of the wood used in stud for wooden structure was confirmed from the each simulation. In addition, the thermal transmission of building members and the thermal bridge at the conjunction of building members according to thermal conductivity from each simulation programs were researched. The thermal conductivity of pine that has the largest variation among the energy simulation was applied to the thermal properties of studs in wooden structure. The maximum error between the maximum and minimum thermal transmission of roof, wall, and floor slab was 0.023 W/m2?K. Plus, that thermal bridge at Rafter junction on the roof, roof-wall joint, and floor slab-wall joint, and floor slab-wall joint was 0.025 W/m2·K. The heat transfer image for changes in temperature and the heat exchange were analyzed by HEAT2 program. The distorted temperature lines were found around the insufficient insulated connection parts. It was predicted that the temperature at the distorted parts in the analyzed image was lower than that of the other portion of the other structures.
패시브 하우스(Passive House) 설계 기준에 대한 고찰
차정훈(Cha Jung-Hoon),김석환(Kim Sug-Hwan),정수광(Jeong Su-Gwang),김수민(Kim Sumin),최정만(Choi Jeong-Man) 한국건축친환경설비학회 2013 한국건축친환경설비학회 논문집 Vol.7 No.1
The term of Green, from the viewpoint of various agreements and concerns at home and abroad, forms a certain paradigm. In building industry, many approaches such as energy-zero house have been evaluated to accomplish the greenhouse gas reduction goal. Many countries of Europe introduced the concept of the Passive House to reduce greenhouse gas emission in the construction sector. Passive House makes building more airtight and install lower U-value walls and windows. And most important purpose is to prevent the decline of indoor air quality. To improve indoor thermal comfort is the most important purpose. In this study, Europe’s Passive House design and ventilation standard is summarized.
PHPP를 활용한 일반 목조주택과 목조 패시브하우스의 난방에너지 성능 비교 분석
유슬기(Yu, Seul-Gi),김석환(Kim, Sug-Hwan),서정기(Seo, Jung-Ki),김수민(Kim, Su-Min) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.8
In recent times, it has been an increased demand of wood frame house in Korea due to their environmental performance and economic feasibility. Most of the passive houses in Europe have been made of wood and showed superior energy performance. To improve thermal performance of Korean wood frame house in the level of passive houses, analysis of thermal properties such as heat gain, heat loss, and annual heat demand was conducted between Korean wood frame house and wooden passive house using PHPP (Passive House Planning Package) 2007 program. PHPP is excel-based program to calculate anuual heat demand based on DIN EN 832 and EN regulations of European Union. The simulation results showed that annual heat demand of Korean wood frame house was 78 kWh/m²a and most of the heat loss was transmission heat loss of windows because of their low thermal resistance. Detailed and advanced criteria for Korean wood frame house are needed in the future to save building energy and maintain comfortable indoor environment.