• The Magazine for Energy Service Companies
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• s.64
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• pp.14-17
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• 2010

친환경 건축물은 자연친화적인 건물을 실현해 사용에너지를 최소화하고 탄소배출을 줄이는 것을 목표로 한다. 에너지사용을 먼저 줄인 후 그 다음 신재생에너지로 필요한 에너지를 충당해야 한다는 것. 때문에 친환경 건축 설계기법으로 최적향 선택과 에너지효율화를 높일 수 있는 외피시스템, 고성능 단열재, 고 단열 창호, 폐열회수환기시스템 등이 거론되고 있다. 친환경 건축의 바른 길을 위해 숙지해야 할 요소를 짚어보았다.

• Journal of Energy Engineering
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• v.21 no.2
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• pp.152-157
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• 2012

Due to the global warming and energy exhaustion, energy efficiency improvement of construction is recognized the stream of times. To improve the efficiency of the building, in order to energy saving, passive elements should be applied. Then the first step be supposed that applying the new standards about the insulation boundary. The current insulation boundary standards are not reasonable as well as does not divide the purposes. As a result, energy is being wasted and many civil complaints are also occurred. To improve these problems, applying the insulation boundary need to divide the heating and non-heating and subdivide the purpose of construction. In this study, accurate real heating and air conditioning areas are presented that work on the new insulation boundary of purposes and applicable standards. This proposed, by the real heating and air conditioning areas, insulation boundary of purposes, matching the reasonable capacity and load of equipment, by working on standards by optimal maintenance can be energy saving, to present guidelines that environment improvement of actual residents as well as energy saving be expected.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.4
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• pp.141-147
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• 2010

Liquefied natural gas(LNG) is natural gas that has been converted temporarily to liquid form for ease of storage and transport it. Natural gas is the worlds cleanest burning fossil fuel and it has emerged as the environmentally preferred fuel of choice. In Korea, the demand of this has been increased since the first import from the Indonesia in 1986. LNG takes up about 1/600th the volume of natural gas in the gaseous state by cooling it to approximately $-162^{\circ}C(-260^{\circ}F)$. The reduction in volume therefore makes it much more cost efficient to transport and store it. Modern LNG storage tanks are typically the full containment type, which is a double-wall construction with reinforced concrete outer wall and a high-nickel steel inner tank, with extremely efficient insulation between the walls. The insulation will be installed to LNG outer tank for the isolation of cryogenic temperature. The insulation will be installed in the base slab, wall and at the roof. According to the insulation's arrangement, the different aspects of temperature transmission is shown around the outer tank. As the result of the thermal & stress analysis, by the installing cellular glass underneath the perlite concrete, the temperature difference is greatly reduced between the ambient temperature and inside of concrete wall, also reducing section force according to temperature load.

• Journal of Energy Engineering
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• v.22 no.2
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• pp.83-89
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• 2013

Energy consumption is closely related to our lives. As Korea has four seasons, heating and cooling system is considered as essential facilities for the residential buildings. Accordingly, the government has continuously strengthened the design criteria to improve energy for new and existing building to save energy. The most important factor in the energy efficiency analysis for apartment is the heat transmission coefficient, and the value is significantly different as the heating energy amount is greatly different according to the window area ratio versus facade area ratio. Therefore, it is time to conduct continuous set-up for goal to enhance efficiency and restriction on window area ratio versus facade area ratio.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.124.2-124.2
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• 2015

최근 에너지 효율을 향상시키고 감성과 기능성을 동시에 만족시킬 수 있는 스마트 윈도우 (Smart Window) 기술이 큰 주목을 받고 있다. 신개념의 하이브리드형 열선차단 코팅기술로 고투명, 고단열 등 복합기능을 가지고 있음. 4계절 변화가 뚜렷한 대한민국 실정에 가장 적합하여 건축물의 냉 난방 에너지를 최소화하는데 크게 기여할 것으로 기대된다. 단열필름 제조 방식에는 보급형 필름으로 염료 방식, 금속 방식 등이 있고 고성능 필름에는 나노 세라믹 방식과 스퍼터 방식+세라믹 방식을 융합한 필름(스퍼터 IR 필름)이 있다. 본 연구에서는 DC pulse sputter를 이용하여 고굴절율 물질인 TiO2와 저굴절률 물질인 SiO2를 적층으로 성장시켜 단열 스마트필름을 제작해 보았다. 높은 가시광 투과율과 IR 차페 성능을 확인하였고, 제작한 스마트필름을 또다른 윈도우 기술에 적용하는 연구를 진행하였다.

• The Journal of Engineering Geology
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• v.26 no.4
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• pp.505-513
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• 2016

The qualitative distribution of a fractured aquifer was characterized by electrical resistivity surveying as a part of basic groundwater investigation in Jangseong. The results were then used to choose sites for observation wells. The locations and distributions of permeable discontinuities were studied by analyses of temperature logs, a borehole image-processing system (BIPS), and hydraulic pressure testing using a double packer. The pressure test showed that the size of the discontinuities correlated with the Lugeon value and the results of the temperature log. The results show that temperature measurement is an effective method to identify permeable discontinuities, with the temperature difference correlating with the size of the aperture of the discontinuity.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.4
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• pp.285-291
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• 2001

An 8-b$\times$8-b adiabatic pipelined multiplier is designed. Simplified four phase clock generator is also designed to provide supply clocks for adiabatic circuits. All the clock line charge on the capacitive interconnections is recovered to save energy. Adiabatic circuits are designed based on ECRL(efficient charge recovery logic) and are integrated using 0.6${\mu}{\textrm}{m}$ CMOS technology. The efficiency of proposed supply clock generator is better than the previous one by 4~11%. Simulation results show that the power consumption of adiabatic pipelined multiplier is reduced by a factor of 2.6~3.5 compared to a conventional pipelined CMOS multiplier.

• Journal of the Korean Institute of Gas
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• v.25 no.1
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• pp.7-13
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• 2021

The re-liquefaction drum is a product that installed spray nozzles at the top to directly spray overcooled LNG into evaporative gas and installed demistors to facilitate gas separation, which was developed to increase the re-liquidity efficiency of small scale re-liquefaction facilities. In the hydrostatic test of the drum, no leakage occurred even at a pressure of 1.5 times the design pressure, but during the BOR(Boil Off Rate) test, the bolt loosening occurred due to contraction and expansion by temperature change. For the continued use of the product, insulation construction on flange connections was developed to enable detachment and attachment, and the comparison of heat load with existing insulation confirmed that it was very small compared to the inlet flow rate in the drum.

• Proceedings of the KAIS Fall Conference
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• 2011.12b
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• pp.511-513
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• 2011

인구증가와 지속적인 산업발전으로 인하여 에너지 소비가 급증하게 되면서 효율적인 에너지 사용의 필요성이 크게 대두되었다. 특히 건물의 창문을 통해 많을 에너지 손실이 일어나 이를 해결하고자 현재 로우이(low-emissivity)유리를 사용하고 있으나 이는 태양광의 유입을 줄이는 단순한 방법으로 여전히 상대적으로 높은 열관류율을 갖고 있다. 이를 해결하고자 현재 단열성능이 좋은 고효율 진공유리가 개발 중이나 아직 가격 및 성능 등의 문제로 본격적인 보급은 이루어지지 않고 있다. 본 논문에서는 내부압력, 지지기둥(spacer)의 길이 및 지름 등이 진공유리 성능에 미치는 영향을 3차원 수치해석을 통하여 알아보았다.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.706-711
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• 2009

Energy shortage and environmental pollution caused by fossil fuels are very serious problem. Especially buildings have consumed more and more energy, and buildings are spend up to 25% of total energy consumption. So we should prepare alternatives to save energy in buildings. In apartment houses, The efficiency of thermal insulators and window glasses is very important to curtail heating energy. In this study, the energy rating of Apartment building is evaluated by applying various thermal insulators and window glasses.