• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 하계학술발표대회 논문집
• /
• pp.844-849
• /
• 2008

In recent semiconductor manufacturing clean rooms, in order to improve clean room air quality, air washers are used to remove airborne gaseous contaminants such as $NH_3$, SOx and organic gases from outdoor air introduced into clean room. Meanwhile, there is a large quantity of exhaust air from clean room. From the energy saving point of view, heat recovery is useful for the reduction of air conditioning energy consumption for clean room. Therefore it is desirable to recover heat from the exhaust air and use it to reheat the outdoor air. However, so far there have not been sufficient studies of analyzing the comparison of the amounts of energy consumption and saving. In the present study, an experiment was conducted to investigate the energy consumption and heat recovery of a fin-coil type air washer system for semiconductor manufacturing clean rooms.

• 한국화재소방학회:학술대회논문집
• /
• 한국화재소방학회 2007년도 춘계학술논문발표회 논문집
• /
• pp.415-420
• /
• 2007

• 청정기술
• /
• 제7권1호
• /
• pp.1-12
• /
• 2001

최근 지속 가능한 개발과 유해화학물질의 국제적 규제를 목표로 한 바젤협약, Agenda 21, POP 의정서 등 여러종류의 국제협약이 진행되고 있으며, 환경규제는 점차 무역규제 형태로 나타날 전망이다. 특히, 화학산업의 경우 이러한 국제협약에 우선적으로 큰 영향을 받을 것이다. 따라서 국내외 환경규제에 대비하기 위하여 오염원에 대한 원천적인 제거와 오염물질을 감량시킬 수 있는 청정기술의 개발 및 도입이 시급하다. 환경친화적 기술개발을 바탕으로 국제 경쟁력의 우위를 유지 또는 선점하기 위하여 우리나라도 환경정책을 선진화하고 환경기술 개발을 촉진시켜 특히 화학산업의 경쟁력을 꾸준히 높여나가야 할 것이다. 본 연구에서는 화학산업과 관련된 국내외 환경규제와 유해화학물질의 관리현황을 살펴보고 화학산업의 발전을 위한 청정기술 개발의 방향을 고찰하고자 한다.

• Rapid Communication in Photoscience
• /
• 제4권4호
• /
• pp.82-85
• /
• 2015

Photoelectrochemical cell (PEC) is one of the attractive ways to produce clean and renewable energy. However, solar to hydrogen production via PEC system generally requires high external bias, because of material's innate electronic band potential relative to hydrogen reduction potential and/or charge separation issue. For spontaneous photo-water splitting, here, we design dye-sensitized solar cell (DSSC) and their monolithic tandem cell incorporated with a $BiVO_4$ photoanode. $BiVO_4$ has high conduction band edge potential and suitable band gap (2.4eV) to absorb visible light. To achieve efficient $BiVO_4$ photoanode system, electron and hole mobility should be improved, and we demonstrate a tandem cell in which $BiVO_4/WO_3$ film is connected to cobalt complex based DSSC.

• 환경위생공학
• /
• 제14권4호
• /
• pp.137-142
• /
• 1999

Current semiconductor industry factories are relying on the end-of-pipe treatment technology for waste water treatment and thus they mostly suffer from severe industrial water shortage. As a result in order to solve those waste and industrial water problems, there requires to be changed to the Clean Technology, that is Pollution Prevention Technology. Through above strategic actions with the Clean Technology, we shall strength more powerful and logical environmental pollution prevention system than those in the past. By changing the end-of-pipe treatment technology for waste water treatment and thus they mostly suffer from severe industrial water problems, there requires to be changed to the Clean Technology, that is Pollution Prevention Technology. Through above strategic actions with the Clean Technology, we shall strength more powerful and logical environmental pollution prevention system than those in the past. By changing the end-of-pipe treatment technology with physical, chemical and biological treatment methods as a mixed stream basis for treating of semiconductor waste stream into clean technology with pollution prevention technology as a waste segregation basis, we can bet 20 to 30% investment reduction as compared with end-of-pipe treatment technology.The results for water quality analysis were as follows : 1. Water quality analysis of the before treatment : pH : 9~10.5, Conductivity : $300~7,000{\mu}s/cm$, TDS : more then $3,000mg/{\ell}$, COD : $200~250mg/{\ell}$, SS : $500~600mg/{\ell}$, n-H : $8.3mg/{\ell}$ 2. Water quality analysis of the after treatment : pH : 6.5~7.5, Conductivity : 0.059, TDS : $40{\mu}s/cm$, COD : $20mg/{\ell}$, SS : $5mg/{\ell}$ n-H : $0.6mg/{\ell}$

• Rapid Communication in Photoscience
• /
• 제2권2호
• /
• pp.42-45
• /
• 2013

Natural photosynthesis utilizes solar energy to convert carbon dioxide and water to energy-rich carbohydrates. Substantial use of sunlight to meet world energy demands requires energy storage in useful fuels via chemical bonds because sunlight is intermittent. Artificial photosynthesis research focuses the fundamental natural process to design solar energy conversion systems. Nicotinamide adenine dinucleotide ($NAD^+$) and $NADP^+$ are ubiquitous as electron transporters in biological systems. Enzymatic, chemical, and electrochemical methods have been reported for NADH regeneration. As photochemical systems, visible light-driven catalytic activity of NADH regeneration was carried out using platinum nanoparticles, molecular rhodium and cobalt complexes in the presence of triethanolamine as a sacrificial electron donor. Pt nanoparticles showed photochemical NADH regeneration activity without additional visible light collector molecules, demonstrating that both photoactivating and catalytic activities exist together in Pt nanoparticles. The NADH regeneration of the Pt nanoparticle system was not interfered with the reduction of $O_2$. Molecular cobalt complexes containing dimethylglyoxime ligands also transfer their hydrides to $NAD^+$ with photoactivation of eosin Y in the presence of TEOA. In this photocatalytic reaction, the $NAD^+$ reduction process competed with a proton reduction.

• 청정기술
• /
• 제14권3호
• /
• pp.160-165
• /
• 2008

Semi-batch 고압반응기에서 구리촉매를 이용한 디메틸카보네이트(DMC) 합성에 대하여 연구하였다. DMC는 메탄올을 일산화탄소와 산소로 직접 산화성 카르보닐화하여 합성되었다. 부식속도는 반응기에 스테인레스스틸 시험 조각을 미리 넣어서 반응하는 동안 그 무게 변화를 측정하여 구하였다. DMC의 수율을 크게 낮추지 않고 부식속도를 낮추기 위하여 아민, 올레핀, 다른 금속염과 같은 첨가제를 사용하였다. 1-메틸이미다졸을 첨가제로 사용하면 부식 없이 18.6%의 DMC 수율을 얻을 수 있었다. DMC의 사용량을 줄이면 0.5%의 낮은 부식속도로 33.2%의 DMC 높은 수율을 얻을 수 있었다.

• 한국수소및신에너지학회논문집
• /
• 제33권5호
• /
• pp.470-498
• /
• 2022

Recently, the world has been considering hydrogen energy as the primary energy transition means to achieve carbon neutrality by 2050. In order to achieve the goal of reducing greenhouse gas emissions, Korea is also promoting a clean hydrogen economy. However, it is necessary to introduce various clean hydrogen from overseas so that the projected demand can not meet the domestically produced. For this study, we conducted the policy comparison approach between countries other than the generally considered technical and economic approaches. The finding proposes the direction of bilateral cooperation for a strategy of securing overseas clean hydrogen from a geopolitical perspective. Germany was a target country for the policy comparison since it has a high proportion of manufacturing, like Korea, and is taking the lead in the renewable-based energy transition policy. According to the survey and analysis of the policy establishment status and new projects of the two countries, Germany is promoting bilateral international cooperation in the hydrogen area with about 33 countries based on 7 types of activities. In comparison, Korea is involved in bilateral cooperation with about 12 countries on relatively few activities. Among the types of bilateral cooperation, R&D cooperation with advanced countries for hydrogen technology was a common activity type. Germany preemptively promotes cooperation for demonstration and commercialization, considering geopolitical means and strengthening manpower training and assistance on policy and regulation to preoccupy the market for the future. Therefore, it is necessary to consider establishing a network of an entire life cycle of supply and demand network that links the future market with securing clean hydrogen considering the geopolitical distribution. To this end, Korea also needs to expand bilateral cooperation countries by activity type, and it seems necessary to seek various geopolitical-based bilateral cooperation and support measures for developing countries to diversify the supply sources of hydrogen.

• 전기화학회지
• /
• 제6권1호
• /
• pp.13-17
• /
• 2003

직접 메탄을 연료전지의 음극 촉매로 사용되는 Pt-Ru/C를 솔-젤법을 이용하여 크라이오젤 및 에어로젤 형태로 제조하였다. 탄소의 원료가 되는 유기물의 종류에 따라 B종의 촉매를 제조하였으며 XRD분석에 의해 금속이 탄소담체 위에 고분산되어 있음을 확인하였다. 초임계건조, 탄화. 환원 공정을 거쳐 완성된 에어로젤 촉매의 전극 활성은 Cyclic voltametry를 이용한 half cell test를 통하여 평가하였다. 그 중 Phloroglucinol-Formaldehyde(PF) 형의 촉매가 가장 우수한 활성을 보였으며 내구성 또한 양호하였다.

• 청정기술
• /
• 제22권4호
• /
• pp.316-325
• /
• 2016

국내에 청정생산기술에 대한 개념이 도입된지 16년이 되었지만 아직도 청정생산기술에 대한 정의와 의미가 중소기업들에 확산이 되지 않은 상황이다. 본 연구에서는 청정생산기술에 대한 개념과 구분을 살펴보고, 환경기술과 녹색기술과의 관계 그리고 국내외에서 구분하고 있는 기술 종류 등을 비교분석하였다. 그리고 국내 중소기업들에 청정생산기술이 확산되기 위한 방안으로 현재 정부에서 지원하고 있는 지역에코혁신사업을 확대하는 정책 제안을 하였다.