• 자원ㆍ환경경제연구
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• 제28권2호
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• pp.231-276
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• 2019

본 연구는 정태적 계산가능일반균형 모형을 사용하여 전기 및 수소차 도입이 국내총생산과 이산화탄소 배출 등에 미치는 영향을 분석하고 평가하였다. 전기 및 수소차 확산이 경제에 미치는 영향에 대한 기존의 견해는 투입구조가 투입절약적으로 변화하기 때문에 경제에 부정적인 영향을 미칠 수 있다는 견해와 전기 및 수소차의 투입절약적 기술진보가 경제에 긍정적인 영향을 준다는 견해가 병존하고 있다. 또한 전기 및 수소차 도입이 가져올 이산화탄소 배출에 관하여서도 분명한 결론은 부재하다. 본 연구는 이러한 전기차 수소차의 환경적 경제적 영향에 대한 견해의 불일치에 대한 하나의 답을 모색하기 위한 시도이다. 본 연구는 전기차 및 수소차가 자동차산업 내에서의 확산에 대한 Bass 모형의 결과를 계산가능일반균형모형(CGE)에 충격으로 통합시키는 방식의 접근을 취하였다. 자동차산업과 자동차 사용 산업의 투입계수와 에너지 최종수요의 변화를 충격으로 주는 계산가능일반균형모형 분석을 통하여 경제 환경적 영향을 추정한 결과 전기차는 이산화탄소 배출 면에서 부정적인 영향을 주고 반면에 수소차는 이산화탄소 배출을 감소시키며, 국내총생산 면에서는 전기차와 수소차 공히 긍정적인 영향을 가져오는 것으로 나타났다. 수소차는 전기차보다 이산화탄소와 국내총생산 면에서 우위를 가지고 있는 것으로 나타났다. 전기차 수소차의 이산화탄소 배출량 변화패턴은 다음과 같이 설명된다. 자동차 사용부문 이산화탄소 배출 측면에서 전기차는 배출량 소폭 증대, 수소차는 소폭감소라는 상반된 결과를 보인다. 그러나 전기차 수소차 공히 자동차 제조 관련 부문에서의 이산화탄소 배출이 증대하는 것으로 나타나고 있으나 이 증가 폭이 자동차 사용부문에서의 변화의 크기보다 상당히 작다. 전기차 수소차의 이산화탄소 배출 패턴은 이 두 가지 효과가 결합하여 나타난 것으로 해석된다.

• 전기학회논문지
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• 제59권2호
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• pp.306-310
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• 2010

On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet synchronous motors have a number of merits such as high efficiency and high power density. Therefore, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted permanent magnet synchronous motor (SPMSM) of them is mainly used as a high-speed machine. However, the motor has a fatal flaw due to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the SPMSM. Thus, in this paper, an interior permanent magnet synchronous motor (IPMSM) is applied in order to drive the air-blower of FCEV instead of the SPMSM, and the experimental results of two models are compared to verify the capability of the IPMSM for high-speed applications.

• 융복합기술연구소 논문집
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• 제7권2호
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• pp.13-16
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• 2017

The design of sealing mechanisms of a manual pressure valve was analyzed with FE analysis for a hydrogen fuels charge and discharge system of FCEV. The damage prediction of the O-ring with respect to the material models of rubbers was calculated by the gap analysis of the backup ring and O-ring according to the internal pressure. Two kinds of the rubber material characteristic models were adopted to the O-ring. One was the linear elastic and the other was hyperelastic of Ogden $3^{rd}$ order model. The experimental data of urethane of Shore hardness 90 was utilized to the curve fitting of hyperelastic properties. It was found that the contact pattern of the backup ring was different in two models and the sealing mechanism was better in the case of the hyperelastic characteristic model.

• 한국수소및신에너지학회논문집
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• 제30권4호
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• pp.356-361
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• 2019

Since the government announced the roadmap to revitalize the hydrogen economy, we are constantly making the effort to expand the use of fuel cell electric vehicles (FCEV) and hydrogen charging stations. There is however a significant issue to build and operate the hydrogen charging station due to the lack of the profit model. Many researchers believe that the supply of FCEV will be increased in the near future and finally ensure the economy of hydrogen charging stations. This study shows that the sales changes of hydrogen gas and consumption patterns by the operation of the hydrogen charging station in Changwon City. The results will be used as the evidence to support for operating the hydrogen charging station by private businesses and the validity of additional establishment of hydrogen charging stations.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.412-414
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• 2009

In recent times, starting up polymer electrolyte membrane fuel cells(PEMFC) in sub-zero condition is a great challenge of fuel cell electric vehicle(FCEV). The water produced in a cathode during PEMFCs operate. The water changes into the form of solid/ice in sub-zero temperatures and this makes trouble in PEMFC cells. Voltage of PEMFC drops and cold startup is failed. This paper describes an experimental study on the effect of thermal cycle to degradation of MEA in PEMFC.

• 한국자동차공학회논문집
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• 제22권7호
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• pp.117-126
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• 2014

Recently, due to various environmental problems such as global warming, increasing of international oil prices and exhaustion of resource, a paradigm of world automobile market is rapidly changing from vehicles using internal combustion engine to eco-friendly vehicles using electric power such as EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid electric Vehicle) and FCEV (Fuel Cell Electric Vehicle). There are many driving cycles for performance evaluation of conventional vehicles. However there is a lack of researches on driving cycle for EV. This study is composed of part 1 and part 2. In this paper part 1, in order to develop urban driving cycle for performance evaluation of electric vehicles, Gwacheon-city patrol route of police patrol car was selected. Actual driving test was performed using EV. The driving data such as velocity, time, GPS information etc. were recorded. GUDC-EV (Gwacheon-city Urban Driving Cycle for Electric Vehicles) including road gradient was developed through the results of analyzing recorded data. Reliability of the driving cycle development method was substantiated through comparison of electricity performance. In the second part of this study, the developed driving cycle was compared to simulation result of the existing urban driving cycle. Verification of the developed driving cycle for EV performance evaluation was described.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.857_858
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• 2009

On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet (PM) synchronous motors have a number of merits such as high efficiency and high power density. Accordingly, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted PM motor of them is mainly used as a high-speed machine. However, the motor has a fatal flaw owing to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the surface-mounted PM motor. Thus, in this paper, an interior PM motor is designed in order to drive the air-blower of FCEV instead of the surface-mounted PM motor, and the experimental results of two models are compared to verify the capability of the interior PM motor for a high-speed machine.

• 한국산학기술학회논문지
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• 제19권12호
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• pp.924-930
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• 2018

본 연구의 목적은 수소연료전지 자동차의 난방부하 대응을 위한 스택 냉각수를 활용하여서, 전동식 히트펌프 시스템에 대한 난방성능 특성을 다양한 운전조건 변화에 대해서 고찰하는 것이다. 냉각수와 냉매(R-134a)와의 열교환을 위해서 판형열교환기를 적용하였고, 전동식 히트펌프 시스템에 적용되는 실내열교환기 입구의 공기온도와 압축기 회전수를 변화시키면서 난방 성능 특성을 분석하였다. 실내열교환기 입구 공기 온도 변화에 대해서 난방 성능은 거의 동일한 결과를 보이고 있는데, 이는 입출구 온도차와 공기 측 밀도의 변화가 균형을 이루었기 때문으로 판단된다. 반면, 히트펌프 시스템 효율(COP)의 경우, 난방 성능은 온도변화에 따라 동일하였지만, 유량 변화로 인하여서, 압축기 소모동력이 감소하였기 때문에, 실내열 교환기 입구 온도가 감소함에 따라서, 시스템 효율은 증가하는 경향을 보이고 있다. 추가적으로, EEV개도가 45%정도까지 열리는 구간에서는, 압축기 소모전력 감소하였기 때문에, 시스템 효율이 증가하였고, 그 이후에는 동일한 시스템 효율을 유지하는 것을 알 수 있었다. 압축기 회전수 변화 시에는 난방성능이 증가하면, 시스템 효율은 감소하는 경향을 보여주고 있다. 이러한 원인은 압축기 회전수 증가에 따른 유량의 증가로 판단된다. 향후, 열원으로 사용하는 냉각수에 대한 운전조건을 변화시켜가면서, 난방성능 특성을 분석하여, 전동식 히트펌프의 난방부하 대응을 위한 제어 방안을 연구하고자 한다.

• 한국소음진동공학회논문집
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• 제18권9호
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• pp.972-981
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• 2008

The blower which is installed in a FCEV(fuel cell electric vehicle) may cause noise due to misalignment and unbalance of mechanical components that rotate at high speed. One of the key points in efforts to minimize the noise radiation from a blower is the knowledge of the main radiating component and the relation between the surface vibration of a blower and the sound pressure. In this research, the blower model is developed based on FEM(finite element method). FE(finite element) model is reliable by correlation of frequencies and MAC(modal assurance criterion) values between EMA(experimental modal analysis) and FEA(finite element analysis). This model is applied to predict the vibration of a blower by using inverse force identification method and predict the radiating noise by using BEM(boundary element method). Comparing the frequencies of resonance and those mode shapes between EMA and FEA, a structural modification of the FE model is evaluated for reducing the parameters of the blower noise.

• Corrosion Science and Technology
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• 제22권4호
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• pp.232-241
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• 2023

The mechanical properties of the hydrogen valve responsible for supplying and blocking hydrogen gas in a hydrogen fuel cell electric vehicle (FCEV) were researched. Mechanical properties by hydrogen embrittlement were investigated by coating chromium nitride (CrN) and titanium nitride (TiN) on aluminum alloy by arc ion plating method. The coating layer was deposited to a thickness of about 2 ㎛, and a slow strain rate test (SSRT) was conducted after hydrogen embrittlement to determine the hydrogen embrittlement resistance of the CrN and TiN coating layers. The CrN-coated specimen presented little decrease in mechanical properties until 12 hours of hydrogen charging due to its excellent resistance to hydrogen permeation. However, both the CrN and TiN-coated specimens exhibited deterioration in mechanical properties due to the peeling of the coating layer after 24 hours of hydrogen charging. The specimens coated at 350 ℃ presented a significant decrease in ultimate tensile strength due to abnormal grain growth.