• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.1075-1080
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• 2006

Purpose of this study is proposal of estimating method about window thermal performance that based on KS F 2278 'Test method of thermal resistance for windows and doors' due to material composition of PVC frame window. First step of this study is research of present state about material composition of PVC frame window. Second is selection of main effective elements about window thermal resistance. For example, composition of Glazing, Frame area ratio of total window area, frame width, opening type, area of heat transfer and so on. Third is multiple regression analysis about thermal performance of PVC frame window due to main effective elements. It produces equations of multiple regression analysis due to opening type. Case of sliding window is $Y=0.149+0.034X_g+0.248X_{far}$, 4track sliding is $Y=0.584+0.175X_g+1.355X_{far}-0.008X_{fw}$, Tilt & Turn window is $Y=-0.161+0.076X_g+0.576X_{far}+0.0008X_{fw}$.

• Journal of the Korea Institute of Building Construction
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• v.16 no.1
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• pp.9-15
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• 2016

The part of a building with the biggest energy loss is the exterior and many studies are actively conducted to reduce the energy loss on that part. However, most studies consider the window frames and insulation materials, but many studies do not discuss the concrete that takes more than 70% of the exterior. In order to minimize the energy loss of buildings, it is necessary to enhance the concrete's insulation performance and studies need to be conducted on this. Therefore, this study used a micro foam cell admixture, calcined diatomite powder, and lightweight aggregates as a part of a study to develop a type of concrete with improved insulation performance that has twice higher thermal conductivity compared to concrete. It particularly secured the porosity inside concrete to lower thermal conductivity. As a result of the experiment, the slump and air capacity showed fair results, but all mixtures containing micro foaming agent showed 14.3~35.1% lower mass per unit of volume compared to regular concrete. Compressive strength decreased slightly due to the materials used to improve the insulating performance, but it all satisfied this study's target strength(24MPa). Thermal conductivity was up to twice higher than that of regular concrete.

• Composites Research
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• v.19 no.1
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• pp.9-14
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• 2006

Experimental investigation on heat transfer ratio was firstly performed with three types of sandwich panels such as the Carbon/Epoxy Skin-Aluminum Honeycomb and Balsa Core Sandwich Panel of 37mm thickness, the Carbon/Epoxy Aluminum Skin-Honeycomb Core Sandwich Panel of 57mm thickness (including insulator) and the Carbon/Epoxy Skin-Aluminum Honeycomb Core Sandwich Panel of 37mm thickness based on the KS F 2278:2003(Insulation test method of windows). In additional to this investigation, experimental tests were also done for evaluation of heat transportation ratio with the Aluminum Skin- Aluminium Honeycomb Sandwich Panels of 27mm and 35mm thickness, and Aluminum Skin-Foaming Aluminum Sandwich Panel of 27mm thickness by the KS F2277:2002 (Insulation measuring method of construction component-Calibration heat box method or protective heat box method). In this study, it was found that the larger net heat transfer cross sectional area between the skin and the sandwich core is given, the higher heat transportation ratio occurs. It was also found that the hybrid type insulation had better insulation characteristics compared to the non-hybrid type insulation.

• 월간 기계설비
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• s.277
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• pp.48-55
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• 2013

국토교통부(장관 서승환)는 수직증축 리모델링 허용 등을 포함한 '공동주택 리모델링 제도개선 방안'(6.5 발표)의 후속조치로 노후 공동주택 거주 주민이 부담 가능한 범위에서 불편사례를 선택적으로 개선할 수 있도록 '맞춤형 리모델링' 활성화를 위한 연구용역을 마무리하고, 조만간 가이드라인을 제작 발표할 계획이라고 밝혔다. 가이드라인에는 주차장 부족, 배관 노후화 등 노후 공동주택 거주 주민들의 주요 불편사항(급 배수관 노후화, 주차장 부족, 난방효율 저하, 승강기 부족 등)을 효과적으로 해소할 수 있도록 단지 동 세대 내에서 각각 시행할 수 있는 총 39가지의 리모델링 아이템에 대한 소개와 공사비 등의 정보가 포함될 예정이다. 먼저, 단지내 리모델링에는 데크 지하주차장 신설, 녹지 보육시설 및 헬스장 등 확충, 노후상가 철거 후 별동 증축 등이 포함되며, 아파트 개별 동 내에서는 급 배수관/전기 통신/소방 등 노후 설비 교체, 승강기 신설, 코어증축(복도${\rightarrow}$계단식 변경) 등이, 세대 내에는 문 창호 및 내장재 교체, 단열 기밀 등 에너지 성능 향상, 실내공간 재배치 등이 포함된다. 특히, 아이템별 이주기간을 재실형과 이주형으로 구분하여 주민 선택의 폭을 한층 더 넓힐 것으로 기대된다.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.167-170
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• 2009

최근 에너지 사용이 획기적으로 증가함에 따라 효율적인 에너지 사용이 필요하게 되었다. 특히 건물에서 벽체보다 에너지 손실이 많이 발생하는 창호의 경우 단열성능이 좋은 고효율 진공유리의 사용이 절실하나, 가격 및 성능 등의 문제로 보급화가 늦어지고 있는 실정이다. 본 연구에서는 저가형 고효율 진공유리 개발을 위한 기초 연구로써 유리 용접용 수소-산소 혼합가스 토치 개발하기 위한 열해석을 수행하였다. 주로 토치의 형상, 노즐 배치 및 직경 변경을 통한 토치 최적화를 수행하였다.

• 한국태양에너지학회:학술대회논문집
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• 2009.04a
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• pp.286-290
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• 2009

Generally the window of the building is an objective of mining and having a distant view and also for a circulation it will can open and shut because becomes the structure insulation, the meat detailed drawing it does a very difficult portion, it is. To reduce the loss of the energy which leads, to an air conditioning energy and an expense increase problem the color which the interior furniture and the clothing due to the augmentation and the corpse ultraviolet rays of the unpleasant feeling which is caused by with the transient one solar energy influx which leads the window will burn, it joins in the window and it confronts and the novel solution is demanded.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.341.2-341.2
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• 2014

산화물 반도체는 가시광선 영역인 380~780 nm 부근에서의 투과율이 80% 이상이고, 3.2 eV 이상의 band gap과 높은 mobility를 가지는 물질로서 투명한 스마트 창호필름이나 디스플레이에 유망한 물질로 연구되고 있다. 본 연구에서는 스마트 윈도우에 적용되는 높은 가시광 투과율과 적외선 차단을 위한 필름개발을 목적으로 산화물 반도체인 $TiO_2$ 물질을 RF Sputter를 이용하여 상온에서 박막성장을 하였다. Glass와 PET 위에 동시에 성장시켜 각각의 기판에 성장된 $TiO_2$ 박막의 물리적인 성질 등을 조사하였다. 측정은 Ellipsometry를 이용하여 광학적인 두께와 굴절률을 조사하였고 UV visible spectrometer를 통해 광학적인 투과도를 확인하였다. 100Watt 부터 RF power를 높여가며 Working Pressure 변화변 주었을 때 낮은 RF power와 Working Pressure에서 높은 가시광 투과율을 확인 할 수 있었다.

• KIEAE Journal
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• v.15 no.1
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• pp.77-82
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• 2015

The purpose of this study is to compare the thermal insulation performance of windows according to the formation of air layer and to evaluate its energy efficiency on a selected standard house. A thermal insulation test, KS F 2278 was used to measure U-values (Heat transmission coefficients) for the following three cases: the first case (Case 1) is a Low-E pair glass (Argon injected), the second case (Case 2) is a Low-E pair glass with the air cap attached on the glass surface, and the third case (Case 3) is a Low-E pair glass, on the frame of which the air cap is attached. The evaluation of the energy efficiency was conducted according to a building energy calculation method from ISO 13790, calculation of energy use for space heating and cooling, using the U-values obtained from the thermal insulation tests. As results of the tests, the U-values of Case 1, Case 2, and Case 3 were $1.668W/m^2{\cdot}K$, $1.568W/m^2{\cdot}K$, and $1.319W/m^2{\cdot}K$ respectively. The Case 2 had about 5.9% lower value than the Case 1, and the Case 3 had about 20.9% lower value than the Case 1. It seems that the thermal performance of the windows is attributed to an increase of the heat resistance and the thickness of air layer. An evaluation of the energy efficiency of the three cases on the selected standard house showed that the amount of heating energy demand per unit area was $7.776kWh/m^2{\cdot}yr$ for the Case $1,6.856kWh/m^2{\cdot}yr$ for the Case 2, and $4.856kWh/m^2{\cdot}yr$ for the Case 3. This study suggests that the formation of air layer (by using air cap) and its thickness should reduce the heat energy demand and thus improve the energy saving efficiency

• Journal of the Korea Institute of Building Construction
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• v.21 no.4
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• pp.257-268
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• 2021

This study analyzed the major issues of 24 defect litigation precedents before and after 2013, based on 2013, when defect litigation in relation to the rapidly increasing defect disputes in apartment houses. The amount of defect removal per household is 2,572 thousand won per household, which is about 5% less than before 2013 from 2013, but the judgment amount per household has rather increased by about 19%, showing 1,916 thousand won per household after 2013. By type of construction, defects on cracks accounted for the largest proportion before and after 2013. Before 2013, equipment, tiles, and windows appeared in the order, and after 2013, landscaping, tiles, insulation and window work were in the order. In order to prevent such defect disputes, efforts to prevent defect disputes will be needed in the design stage, construction stage, and maintenance stage.

• Journal of the Korean Geotechnical Society
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• v.30 no.9
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• pp.57-66
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• 2014

The ground in cold region consists of active and permafrost layers. The active layer at the unstable state may cause ground corrosion and uplift, when the temperature of frozen ground increases due to seasonal changes. The thermosyphon is one of the stabilization methods to maintain the ground stability in the frozen ground. The thermosyphon is a closed two-phase convection device that extracts heat from the ground and discharges it into the atmosphere. In this study, ground freezing experiment using a thermosyphon and simulated ground with the isolation material was conducted to evaluate the thermal performance of the thermosyphon. In order to consider the thermal performance of the thermosyphon, commercial numerical program (TEMP/W) was adopted. Likewise, the thermal performance of thermosyphon and thermal properties of ground were applied in the numerical model. In a series of comparisons with experiment results and numerical study, thermal performance of thermosyphon can be evaluated.