• Title/Summary/Keyword: Green Hydrogen

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Experimental Study on the Mutual Influence of Thermal Management System for Hydrogen Fuel Cell Vehicle (수소연료전지 자동차 열관리 시스템의 상호 영향도 분석을 위한 실험적 연구)

  • Lee, Moo-Yeon;Won, Jong-Phil;Cho, Choong-Won;Lee, Ho-Seong
    • Transactions of the Korean hydrogen and new energy society
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    • v.22 no.6
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    • pp.852-858
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    • 2011
  • This paper is aiming to estimate the mutual influence of the stack cooling performances with the operation modes of the thermal management system for the hydrogen fuel cell vehicles. The heat capacity of the thermal management system was measured by varying the operating modes such as stack cooling heat exchanger only (Mode 1), stack cooling and electric devices cooling heat exchangers (Mode 2), and stack cooling and electric devices cooling heat exchangers with an operation of the condenser (Mode 3).As the results, Performance of the thermal management system (TMS) at Mode 3 decreased up to 34.0%, compared with the result of the Mode 1. In addition, in order to optimize the performance of TMS, the entropy change of stack cooling heat exchanger using irreversibility analysis technique was analyzed with the relationship between entropy generation and entering air velocity of the thermal management system.

Effect of Limiting Factors for Hydrogen Production in Sulfur Deprived Chlamydomonas Reinhardtii (황결핍 된 Chlamydomonas Reinhardtii 배양액에서 수소생산을 위한 제한 인자들의 영향)

  • Kim, Jun-Pyo;Sim, Sang-Jun
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.3
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    • pp.286-292
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    • 2006
  • Chlamydomonas reinhardtii is a green algae that can use light energy and water to produce hydrogen under anaerobic condition. This work reports the effect of limiting factors on hydrogen production in sulfur deprived anaerobic C. reinhardtii culture. In order to confirm the relationship between hydrogen production and limiting factors such as residual PSII activity and endogenic substrate degradation, the increase in chlorophyll concentration and the decrease in starch concentration was investigated during sulfur deprivation. The overall hydrogen production increased depending on cell density in range of $0.4{\sim}0.96\;g$ DCW/l. At this time, the increase in chlorophyll concentration during 24 h after sulfur deprivation increased in proportion to hydrogen production, however, the decrease in starch concentration was not proportional to that. Therefore, hydrogen production under sulfur deprivation using green alga was closely associated with the residual PSII activity than the endogenic substrate degradation.

An Evaluation of Net-zero Contribution by Introducing Clean Hydrogen Production Using Life Cycle Assessment (청정수소 생산 방식 도입에 따른 LCA 기반 탄소중립 기여도 평가)

  • SO JEONG JANG;DAE WOONG JUNG;JEONG YEOL KIM;YONG WOO HWANG;HEE KYUNG AN
    • Transactions of the Korean hydrogen and new energy society
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    • v.35 no.2
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    • pp.175-184
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    • 2024
  • This study focuses on investigating the importance of managing greenhouse gas emissions from global energy consumption, specifically examining domestic targets for clean hydrogen production. Using life cycle assessment, we evaluated reductions in global warming potential and assessed the carbon neutrality contribution of the domestic hydrogen sector. Transitioning from brown or grey hydrogen to blue or green hydrogen can significantly reduce emissions, potentially lowering CO2 equivalent levels by 2030 and 2050. These research findings underscore the effectiveness of clean hydrogen as an energy management strategy and offer valuable insights for technology development.

A Simulation Study of Renewable Power based Green Hydrogen Mobility Energy Supply Chain Systems (재생에너지 기반 청정 수소 운송 에너지 시스템 모사 연구)

  • Lee, Joon Heon;Ryu, Jun-Hyung
    • Korean Chemical Engineering Research
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    • v.60 no.1
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    • pp.34-50
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    • 2022
  • Since the Paris climate agreement, reducing greenhouse gases has been the most important global issue. In particular, it is necessary to reduce fossil fuels in the mobility sector, which accounts for a significant portion of total greenhouse gas emissions. In this paper, we investigated the economic feasibility of green mobility energy supply chains, which supply hydrogen as fuel to hydrogen vehicles based on electricity from renewable energy sources. The design and operation costs were analyzed by evaluating nine scenarios representing various combinatorial possibilities such as renewable energy generation, hydrogen production through water electrolytes, hydrogen storage and hydrogen refueling stations. Simulation calculations were made using Homer Pro, widely used commercial software in the field. The experience gained in this study could be further utilized to construct actual hydrogen energy systems.

Exergy Analysis and Heat Exchanger Network Synthesis for Improvement of a Hydrogen Production Process: Practical Application to On-Site Hydrogen Refueling Stations (수소 생산 공정 개선을 위한 엑서지 분석과 열 교환망 합성: 분산형 수소 충전소에 대한 실용적 적용)

  • YUN, SEUNGGWAN;CHO, HYUNGTAE;KIM, MYUNGJUN;LEE, JAEWON;KIM, JUNGHWAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.5
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    • pp.515-524
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    • 2022
  • In this study, the on-site hydrogen production process for refueling stations that were not energy-optimized was improved through exergy analysis and heat exchange network synthesis. Furthermore, the process was scaled up from 30 Nm3/h to 150 Nm3/h to improve hydrogen production capacity. Exergy analysis results show that exergy destruction in the SMR reactor and the heat exchanger accounts for 58.1 and 19.8%, respectively. Thus, the process is improved by modifying the heat exchange network to reduce the exergy loss in these units. As a result of the process simulation analysis, thermal and exergy efficiency is improved from 75.7 to 78.6% and 68.1 to 70.4%, respectively. In conclusion, it is expected to improve the process efficiency when installing on-site hydrogen refueling stations.

Process Modeling and Economic Analysis of Hydrogen Production System on 500 kg-H2/d-class Green Hydrogen Station using Biogas (바이오가스 이용 500 kg-H2/d급 그린수소충전소의 수소추출시스템 공정모델링 및 경제성 분석)

  • Hong, Gi Hoon;Song, Hyoungwoon
    • Journal of the Korean Institute of Gas
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    • v.25 no.4
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    • pp.19-26
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    • 2021
  • In this paper, we carried out the process modelling and economical analysis of the 500 kg-H2/d-class green hydrogen production system process based on biomethane from the Food Bio Energy Center in Chungju. As a result of economic analysis, the NPV(Net present value) after 15 years of operation is 3.831 billion won, the PI(Profitability index method) is 1.42. It was found that the project of 500 kg-H2/d-class green hydrogen production system has a 20.25% of IRR, which is higher than social discount rate of 4.5% and feasibility is ensured.

Enzymatic Hydrolysis of Pre-treated Ulva pertusa with Alkaline Peroxide (구멍갈파래의 알칼리 과산화수소 전처리 및 효소 가수분해 특성)

  • Yoon, Byung-Tae;Kim, Young-Wun;Chung, Keun-Wo;Kim, Jin-Seog
    • Applied Chemistry for Engineering
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    • v.22 no.3
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    • pp.336-339
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    • 2011
  • Algae is an abundant and potential fermentation substrate. The enzymatic hydrolysis of algae was investigated by pre-treating an alkaline hydrogen peroxide with commercial cellulase and viscozyme. Algae used in this study was the Ulva pertusa. The evaluated response was the yield of released glucose after the enzymatic hydrolysis. Alkaline hydrogen peroxide containing mixtures of 1 wt% hydrogen peroxide and 1~1.75 wt% sodium hydroxide was also used. The results show that the highest glucose conversion was obtained for Ulva pertusa using 5 wt% hydrogen peroxide at $60^{\circ}C$ for 3 h. The required amount of enzymes after the pre-treatment with alkaline hydrogen peroxide were reduced by far compared to that of untreated Ulva pertusa. Also, the amount of glucose that is released during the enzymatic hydrolysis was increased.

A Study on the Quantitative Risk Assessment of Mobile Hydrogen Refueling Station (이동식수소스테이션 정량적 위험성평가에 관한 연구)

  • KIM, DONG-HWAN;LEE, SU-MIN;JOE, CHOONG-HEE;KANG, SEUNG KYU;HUH, YUN-SIL
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.6
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    • pp.605-613
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    • 2020
  • In July and October of this year, the government announced the 'Green new deal plan within the Korean new deal policy' and 'Strategies for proliferation of future vehicles and market preoccupation'. And, in response to changes in the global climate agreement, it has decided to expand green mobility such as electric vehicles and hydrogen electric vehicles with the aim of a "net-zero" society. Accordingly, the goal is to build 310 hydrogen refueling stations along with the supply of 60,000 hydrogen vehicles in 2022, and the hydrogen infrastructure is being expanded. however, it is difficult to secure hydrogen infrastructure due to expensive construction costs and difficulty the selection of a site. In Korea, it is possible to build a mobile hydrogen station according to the safety standards covering special case of the Ministry of Industry. Since the mobile hydrogen station can be charged while moving between authorized place, it has the advantage of being able to meet a large number of demands with only one hydrogen refueling station, so it is proposed as a model suitable for the early market of hydrogen infrastructure. This study demonstrates the establishment of a hydrogen refueling station by deriving a virtual accident scenario for leakage and catastrupture for each facility for the risk factors in a mobile hydrogen station, and performing a quantitative risk assessment through the derived scenario. Through the virtual accident scenario, direction of demonstration and implications for the construction of a mobile hydrogen refueling station were derived.

Technical Review on Liquid/Solid (Slush) Hydrogen Production Unit for Long-Term and Bulk storage (장주기/대용량 저장을 위한 액체/고체(Slush) 수소 생산 장치의 해외기술 동향분석)

  • LEE, CHANGHYEONG;RYU, JUYEOL;SOHN, GEUN;PARK, SUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.565-572
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    • 2021
  • Hydrogen is currently produced from natural gas reforming or industrial process of by-product over than 90%. Additionally, there are green hydrogens based on renewable energy generation, but the import of green hydrogen from other countries is being considered due to the output variability depending on the weather and climate. Due to low density of hydrogen, it is difficult to storage and import hydrogen of large capacity. For improving low density issue of hydrogen, the gaseous hydrogen is liquefied and stored in cryogenic tank. Density of hydrogen increase from 0.081 kg/m3 to 71 kg/m3 when gaseous hydrogen transfer to liquid hydrogen. Density of liquid hydrogen is higher about 800 times than gaseous. However, since density and boiling point of liquid hydrogen is too lower than liquefied natural gas approximately 1/6 and 90 K, to store liquid hydrogen for long-term is very difficult too. To overcome this weakness, this paper introduces storage method of hydrogen based on liquid/solid (slush) and facilities for producing slush hydrogen to improve low density issue of hydrogen. Slush hydrogen is higher density and heat capacity than liquid hydrogen, can be expected to improve these issues.