• 한국수소및신에너지학회논문집
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• 제19권4호
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• pp.266-275
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• 2008

The performance improvement of each part for durability, safety and cost of high pressure storage system for fuel cell vehicle has been focused so far. However, for the mass production of fuel cell vehicle, it is necessary to evaluate durability and safety in system module and vehicle level. The test procedure to evaluate vibration and collision safety of high pressure hydrogen storage system for the fuel cell vehicle is established and its reliability is verified.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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• pp.212-214
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• 2009

The polymer electrolyte membrane fuel cell(PEMFC) with the advantages of low-operating temperature, high current density, low cost and volume, fast start-up ability, and suitability for discontinuous operation becomes the most reasonable and attractive power system for transportation vehicle and micro-grid power plant in a household. 200W PEMFC(Polymer electrolyte membrane fuel cell) system applied to middle and small-scaled micro-grid power system was constructed by this study, then the electrical characteristics and diagnosis of the fuel cell were analyzed with thermal variation.

• 대한기계학회논문집B
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• 제27권11호
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• pp.1579-1586
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• 2003

A gun-type burne. fur a LPG(Liquified Petroleum Gas) boiler was utilized for hydrogen combustion. The study was performed to obtain fundamental data prior to the design of a very low NO$\_$x/, hydrogen-fueled burner. First, numerical simulations were performed to predict mixing characteristics between air and fuel flows, and temperature distributions, etc. Experimental study was then performed to find out flame lengths, temperature distributions, and NO$\_$x/ concentrations. The results showed that a gun-type burner for a LPG boiler can be successfully used for hydrogen combustion without any major retrofitting. The hydrogen flame was very stable and 75 ppm of NO$\_$x/ in average was observed for the conditions considered in this study. Hydrogen combustion could be therefore a solution to avoid the problem of green-house gas(CO$_2$) if hydrogen becomes cost-effective.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.720-722
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• 2009

This work is mainly focused at developing the hydrogen production unit with the capacity of 20 $Nm^3/h$ of high purity hydrogen. At present steam reforming of natural gas is the preferable method to produce hydrogen at the point of production cost. The developed hydrogen production unit composed of natural gas reformer and pressure swing adsorption system. To improve the thermal efficiency of steam reforming reactor, the internal heat recuperating structure was adopted. The heat contained in reformed gas which comes out of the catalytic beds recovered by reaction feed stream. These features of design reduce the fuel consumption into burner and the heat duty of external heat exchangers, such as feed pre-heater and steam generator. The production rate of natural gas reformer was 41.7 $Nm^3/h$ as a dryreformate basis. The composition of PSA feed gas was $H_2$ 78.26%, $CO_2$ 18.49%, CO 1.43% and $CH_4$ 1.85%. The integrated production unit can produce 21.1 $Nm^3/h$ of high-purity hydrogen (99.997%). The hydrogen production efficiency of the developed unit was more than 58% as an LHV basis.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2010년도 춘계학술대회
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• pp.465-470
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• 2010

Korea government declared that "low carbon, green growth" through green technologies and clean energy to be the new national vision for the next 60 years(President's Liberation Day speech on Aug. 15, 2008). And succeeding "Green New Deal" plan involves nine core projects including energy saving, recycling, clean energy development. It is because hydrogen fuel cell vehicles, using electricity from chemical reaction of hydrogen and oxygen, let out water which is a by-product of such chemical reaction instead of emitting harmful particulate and gases such as NOX, SOX and CO2 that hydrogen fuel cell vehicles and its technology are drawing public attention as one of the sensible solutions in accomplishing "low carbon, green growth" agenda. Nevertheless There are many chances that let the people have a practical experience of hydrogen fuel cell vehicles. Sometimes new products, including hydrogen fuel cell vehicles, made by advanced technology can not penetrate through the market when it faces public skepticism that is stimulated from lack of knowledge and experience. That is the reason why not only cost benefit analyses and scientific risk assessments but also public acceptance studies toward hydrogen fuel cell vehicles have to be performed [Schulte, 2004]. This research address a need for comprehensive study on factors influencing public acceptance of hydrogen fuel cell car, specifically focusing on impacts of personal experience related to governmental science and technology policy toward public acceptance.

• 한국초전도ㆍ저온공학회논문지
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• 제15권2호
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• pp.1-8
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• 2013

This paper reviews the development status of magnetic refrigeration system for hydrogen liquefaction. There is no doubt that hydrogen is one of most important energy sources in the near future. In particular, liquid hydrogen can be utilized for infrastructure construction consisting of storage and transportation. Liquid hydrogen is in cryogenic temperatures and therefore high efficient liquefaction method must be studied. Magnetic refrigeration which uses the magneto-caloric effect has potential to realize not only the higher liquefaction efficiency > 50 %, but also to be environmentally friendly and cost effective. Our hydrogen magnetic refrigeration system consists of Carnot cycle for liquefaction stage and AMR (active magnetic regenerator) cycle for precooling stages. For the Carnot cycle, we develop the high efficient system > 80 % liquefaction efficiency by using the heat pipe. For the AMR cycle, we studied two kinds of displacer systems, which transferred the working fluid. We confirmed the AMR effect with the cooling temperature span of 12 K for 1.8 T of the magnetic field and 6 second of the cycle. By using the simulation, we estimate the total efficiency of the hydrogen liquefaction plant for 10 kg/day. A FOM of 0.47 is obtained in the magnetic refrigeration system operation temperature between 20 K and 77 K including LN2 work input.

• Korean Chemical Engineering Research
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• 제45권1호
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• pp.25-31
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• 2007

석유화학단지내에서 석유화학공장과 정유공장과 같은 산업현장에서는 상당량의 수소가 부산물로 발생되고 있으나, 이는 대부분 자체적으로 연료로 사용되고 있다. 그러나 연료로 사용되는 상당량의 수소를 에너지원의 원료나 기타 공정의 원료로 재활용할 경우, 현재보다 수소의 가치를 높여서 사용할 수 있다. 본 연구에서는 석유화학단지내 공장간 수소 재활용 네트워크를 설계하였다. 수소 핀치 분석을 통하여 교환망 구성에 필요한 최소의 수소 요구 및 정제량을 파악하고, 네트워크 구성에 필요한 비용과 기타 제약 조건으로 최적화 문제를 구성하여 공급처(source)와 수요처(sink) 공장간에 최적으로 수소를 재활용하기 위한 네트워크를 설계하였다.

• Korean Chemical Engineering Research
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• 제43권3호
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• pp.344-351
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• 2005

수소에너지는 기존의 석유화학공업의 원료로서 뿐만 아니라 연료전지와 연계하여 소요량이 급속히 증가할 것으로 예측된다. 장기적으로는 재생에너지를 사용한 물 전기분해, 원자력을 이용한 수소 제조가 주목받고 있지만, 안정된 기술이 확보되기까지는 화석연료를 사용한 수소 제조법이 대용량 수소 제조법 중 가장 경제적인 것으로 분석되고 있다. 현재 화석 연료 중 천연가스를 이용한 수증기 개질 수소 제조법이 상업적인 공정으로 채택되고 있으나 $CO_2$ 분리 처리 비용이 경제성 평가에 중요한 항목으로 부각되고 있다. 따라서 천연가스를 이용한 수소 제조에도 다양한 공정이 제안되고 있으므로 천연가스를 원료로 한 수소 제조 기술의 개발 현황을 살펴보았다.

• 한국수소및신에너지학회논문집
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• 제31권2호
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• pp.177-183
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• 2020

To utilize hydrogen energy, high-yield, high-purity hydrogen needs to be produced; therefore, hydrogen separation membrane studies are being conducted. The membrane reactor that fabricates hydrogen needs to have high hydrogen permeability, selective permeability, heatresistant and a stable mechanical membrane. Dense membranes of Pd and Pd alloys are usually used, but these have drawbacks associated with high cost and durability. Therefore, many researchers have studied replacing Pd and Pd alloys. Dense TiN membrane is highly selective and can separate high-purity hydrogen. The porous alumina has a high permeation rate but low selectivity; therefore, separating high-purity hydrogen is difficult. To overcome this drawback, the two materials are combined as composite reclamations to produce a separation membrane with a high penetration rate and high selectivity. Accordingly, TiN-alumina was manufactured using a high-energy ball mill. The TiN-alumina membrane was characterized by X-ray diffraction analysis, scanning electron microscopy, and energy dispersive spectroscopy. The hydrogen permeability of the TiN-alumina membrane was estimated by a Sievert-type hydrogen permeation membrane apparatus. Due to the change in the diffusion mechanism, the transmittance value was lower than that of the general TiN ceramic separator.

• 설비공학논문집
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• 제21권5호
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• pp.311-318
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• 2009

In previous study, a new allocation methodology of common cost on multi-product have been suggested. The aim of this study is to suggest the methodology that allocates an environment pollution cost including carbon emission cost to each cost of multi-product. For this study, a supposed multi-energy system composed of twenty kinds of systems was made. The multi-energy system produces eighteen kinds of outputs that are electricity, steam, hot water, chilled water, ice, warm air, and cooling air from seven kinds of energy source that are LNG, coil, geothermal energy, sun heat, hydrogen, bio-mass, and waste. The new methodology was applied to the multi-energy system in order to allocate the environment pollution cost to each production cost, and twenty seven equations were induced. From this result, it is concluded that this methodology can estimate each unit cost and allocate each cost flow in any product of any energy system.