• Transactions of the Korean hydrogen and new energy society
• /
• v.29 no.1
• /
• pp.117-123
• /
• 2018

The long-term perception investigation of environment is needed for the persistence of each country's policy on climate change, which is greatly influenced by external factors. Long term data on perception and attitudes of people's thought can be a big data point for climate change and consistent policies can be implemented with the need for public demand. Information on the perception of the general public regarding the environment should be carried out as a basis for the national environmental policy.

• Transactions of the Korean hydrogen and new energy society
• /
• v.19 no.6
• /
• pp.552-560
• /
• 2008

In 1997, Korean government established the National Energy and Resources Plan, which targeted from 1997 to 2005 with strategic energy technology development. At the end of 2005, Korean government built a New National Energy and Resources Plan preparing for upcoming 10 years from 2006 until 2015 based on energy technology trees comparing with the previous plan, which based on the energy R&D projects. In this research, we prioritize the relative preferences and efficiency by an AHP/DEA CCR-I and BCC-I integrated model approach considering scale efficiency for well focused R&D and efficiency of developing Greenhouse Gas technologies as an extended research from a view point of econometrics as an extended research.

• Journal of Digital Convergence
• /
• v.14 no.9
• /
• pp.281-286
• /
• 2016

In this paper, we optimized the structure of hydrogen water generator and assessed by developing a generator with dissolved hydrogen amount(1,000~1,200 ppb) of world-class level. Evaluation is divided into four types, such as dissolved hydrogen amount, pH, maximum pressure, redox potential, and it was evaluated for each of the targets. It was performed through the experiment of four in all five times and all of them show superiority results appearing in the target range. In addition, the assessment got 25/30 functionality, 17/20 maintainability, 26/30 usability, and 19/20 efficiency. In particular, we proved the validity of this study in high efficiency. We developed this hydrogen water generator system as possible to be substitution of water purifier.

• Journal of Energy Engineering
• /
• v.28 no.3
• /
• pp.10-17
• /
• 2019

According to South Korea's policy of supplying eco-friendly hydrogen vehicles, related industries are actively conducting research on the development of hydrogen cars and hydrogen charging station infrastructure. On the other hand, there is a lack of empirical research and assessment of the risk of non-metallic materials (such as liners, seals, gaskets) for classified materials that directly affect the durability and reliability of hydrogen vehicles and hydrogen charging stations. In this study, the risk factors for liners and seals of non-metallic parts used in high-pressure hydrogen installations were derived using FMEA, and the RPN values were calculated by converting the severity, frequency of occurrence and degree of detection into scores. The maximum value of the RPN 600, minimum value 63, average value 278.5 was calculated and periodic control of the liner and seal was identified as important. In addition, through hydrogen soakage and oxygen aging tests for non-metallic rubber products, physical test values that can be used as basic data were presented.

• The Journal of the Korea Contents Association
• /
• v.21 no.6
• /
• pp.306-317
• /
• 2021

With a global shift from carbon economy towards hydrogen economy, leading countries such as the U.S., Europe, China, and Japan are focusing their research capabilities on hydrogen research and development(R&D) by announcing various hydrogen economy policies. South Korea also has been following this global trend by announcing hydrogen economy roadmap in January 2019 and legislating hydrogen economy related law. In this paper, we tried to figure out the national R&D trend of Fuel Cell Electric Vehicle(FCEV) and its knowledge structure by using recent 10-year project data of National Technology and Information Service(NTIS). We collected 1,479 FCEV-related projects and conducted text mining and network analysis. According to the analysis, FCEV-related R&D has been actively carried out over the entire process of hydrogen production, transport, storage, and utilization. Furthermore, the paper provides insights into the government's policy agenda building and market strategy on the hydrogen economy.

• Journal of Environmental Impact Assessment
• /
• v.17 no.1
• /
• pp.67-79
• /
• 2008

Global warming, which is one of the most serious challenges, has been the subject of intense debate and concern for many scientists, policy-makers, and citizens for at least the past decade. To protect the health and economic well-being of current and future generations, we must reduce our emissions like carbon dioxide. Alternatives to achieve an energy future without serious global warming are to change to clean and renewable sources of energy like the wind, the sun lights, rivers, the biomass, hydrogen, and oceans. To identify some of the key and new environmental impacts associated with renewable energy and hydrogen energy, we set up the new conceptual methodology. Specifically, new identified environmental and health impacts are related with the usage of hydrogen energy. When comparing with fossil fuel, the renewable energies can reduce the release of carbon dioxide when they are used except hydrogen produced from fossil fuel. However, all renewable energy technologies are not appropriate to all applications or locations. Our results suggest that all of alternatives to replace fossil fuel can release the several global and local impacts although they seems to be smaller than the impacts from fossil fuel. Therefore, the quantitative and detail analysis to assess environmental impacts of the alternative energies might be useful to make our decision for the future energy against the global warming.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.16 no.3
• /
• pp.313-320
• /
• 2010

Hydrogen energy begins to grab the attention as a leading alternative to solve environmental pollution and energy issue. The preparation for the hydrogen energy age is at the primary stage. But it is expected that the utilization of hydrogen energy is a feasible objective through government policy and invigoration of studies in relevant fields of industry. The preparation and research are badly in need to equip a ship with hydrogen energy engine. Some researches on ship with fuel cell are in progress, however, considering a ship that has become larger and it is being operated in special circumstances, the researches on ship with hydrogen energy engine is keenly necessary. And more concerns and supports are required in this regard.

• Journal of the Korean Institute of Gas
• /
• v.25 no.2
• /
• pp.28-33
• /
• 2021

With the recent growing interest in eco-friendly cars, as interest in eco-friendly cars increases, interest and purchase of hydrogen fuel cell vehicles that do not emit pollutants are increasing. Recently, the government is supporting the expansion of hydrogen charging station and localization of core parts according to the government's hydrogen energy dissemination policy. In this study, the flow characteristics of the hydrogen flow control valve were investigated. As the differential pressure increases, the mass flow rate and flow coefficient tend to be different from the volume flow rate. And it was confirmed that it affects the hydrogen temperature due to the nozzle effect in the bottleneck section, and the change in density affects the mass flow rate.

• Journal of Energy Engineering
• /
• v.16 no.4
• /
• pp.170-180
• /
• 2007

This paper deals with the economy of scale for domestic on-site hydrogen stations fueled with natural gas and naptha. We evaluate the economic feasibility of on-site hydrogen stations with hydrogen production capacities of $30Nm^3/hr,\;100Nm^3/hr\;and\;300Nm^3/hr$. We build a classical economic feasibility model and we make some sensitivity analyses by changing the values of input factors such as the hydrogen sale price and the discount rate. The estimated hydrogen prices of steam methane reforming stations with production capacities of $30\;Nm^3/hr,\;100\;Nm^3/hr\;and\;300\;Nm^3/hr$ are 18,472 won/kg, 10,689 won/kg and 7,758 won/kg, respectively. Also, the hydrogen prices are about the same if we use naptha as a raw material for hydrogen energy instead of natural gas. It turns out that small and medium size domestic on-site hydrogen stations will not be economical in the near future. This indicates that we need to construct large scale on-site hydrogen fueling stations even for the initial phase of the hydrogen economy.

• Transactions of the Korean hydrogen and new energy society
• /
• v.33 no.2
• /
• pp.130-141
• /
• 2022

Due to continuous climate change, greenhouse gases in the atmosphere are gradually accumulating, and various extreme weather events occurring all over the world are a serious threat to human sustainability. Countries around the world are making efforts to convert energy sources from traditional fossil fuels to renewable energy. Hydrogen energy is a clean energy source that exists infinitely on Earth, and can be used in most areas that require energy, such as power generation, transportation, commerce, and household sectors. A fuel cell, a device that produces electric and thermal energy by using hydrogen energy, is a key field to respond to climate change, and major countries around the world are spurring the development of core fuel cell technology. In this paper, research trends in China, the United States, Germany, Japan, and Korea, which have the highest number of papers related to fuel cells, are analyzed through keyword network analysis.