• Journal of Mechanical Science and Technology
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• v.20 no.7
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• pp.1068-1076
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• 2006

A plate-fin type recuperator for a gas turbine/fuel cell hybrid power generation system was designed, manufactured, and tested. Performance analysis shows that the performance of the system is directly affected by the performance of the recuperator. Therefore, the recuperator should be designed and manufactured carefully, and its performance should be tested and verified before it is integrated into the system. In this paper, the developing procedure including designing, manufacturing, and testing of a cross flow plate-fin type recuperator was presented. Performance test results showed that the design requirements of the recuperator were almost satisfied. Based on the test results, improved design to reduce the size of the recuperator was suggested.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.470-473
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• 2005

Spent nuclear fuels are regarded as a high level radioactive waste and they will be disposed in a deep geological repository. To maintain the safety of the repository for hundreds of thousands of years, the spent fuels are encapsulated in a disposal canister and the canister containing spent fuels should have the structural integrity and the corrosion resistance below the several hundreds meters from the ground surface. In this study, the concept of the spent fuel encapsulation process and the process equipment fur deep geological disposal were established. To do this, the design requirements, such as the functions and the spent fuel accumulations, were reviewed. Also, the design principles and the bases were established. Based on the requirements and the bases, the encapsulation process and the equipment from spent fuel receiving process to transferring canister into the underground repository including hot cell processes was established. The established concept of the spent fuel encapsulation process and the process equipment will be improved continuously with the future studies. And this concept can be effectively used in implementing the reference repository system of our own case.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.682-684
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• 2000

에너지 절약과 환경 공해분제 그리고 최근에 부각되고 있는 지구온난화 문제 등을 해결하기 위해 고효율 발전시스템인 연료전지가 주목을 받고 있다 연료전지는 연소과정 없이 화학에너지를 전기 화학적으로 직접 전기로 변환시키는 시스템으로 효율이 높고 공해 물질의 배출이 거의 없기 때문에 매우 이상적인 발전장치이다. 연료전지 발전시스템의 철거 제어기 설계를 위해 필요한 운전 조건 즉 운전온도 압력 등의 운전조건과 연료 농도 공급량이 전지의 성능에 미치는 영향에 대한 특성을분석하였고 이들을 정리하여 최적제어를 위한 기본방식을 얻기 위해 이용하였다 실재 스택에 적용하기 위한 관련 측정시스템과 제어기는 dSPACE-1103과 ControlDesk를 사용하여 구성하였다.

• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.268-269
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• 2007

본 논문은 여러 컨버터 토플로지 중 연료전지의 특성에 맞는 컨버터를 선정하고 인버터 설계를 통하여 연료전지용 PCS시스템을 구현하였으며 시뮬레이션을 통하여 검증하였다.

• Proceedings of the KIEE Conference
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• 2007.11c
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• pp.51-54
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• 2007

In this paper, the dynamic models of a SOFC are rearranged. It consists of electrochemical model, thermal model, voltage equation and several loss equations. Experiment results of the real SOFC system are shown to evaluate the steady voltage characteristics. Control problems on tracking steady voltage by air flow is discussed and an adaptive controller is designed to withstand to the variation of stack current. Simulation is done to prove the solution of control algorithms.

• Proceedings of the SAREK Conference
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• 2005.06a
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• pp.223-223
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• 2005

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1757-1764
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• 2004

It is the urgent task of induce the inhabitants to utilize the public transportation instead of the personal transportation to dissolve the traffic jam. But construction of the subway, the representative substitute means, demands a great of investment expense including various kinds of expenses. So the technical development and research of standardization of FRT(Fuel cell Rubber tired Train), the eco-friendly public transportation system low in construction expenses, effective, excellent in approach as well as in traffic, are propelled positively. This project wants to propose exterior design FRT in which original creative methods are utilized with the target of development and construction of FRT which coincide with anthropocentric eco-friendly traffic system. Utilizing the proposed style as the basic materials, this project wants to grasp difficulties, and to establish the way to solve and develop them.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.14 no.4
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• pp.104-109
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• 2005

The catalyst layer design is one of the most important factors to enhance the performance of PEMFC(Proton Exchange Membrane Fuel Cell) system. The hydrophobic and ion conductive type is studied for the MEA(Membrane Electrolyte Assembly). It is found that those have some limitations for performance enhancement when they are used separately. Thus, the dual catalyst type, a mixed model, is developed for the better MEA performance. In the meantime, the design of flow field plate is subsequently carried out in order to give more enhanced output during its operation. The conductivity of flow field plate showed better performance in the case of manufactured by the more compressed process(20MPa) than by the less compressed process(10MPa). The micro-structure of the flow field plate is examined in details using SEM(Scanning Electron Microscope) to analyse the effects on the different compression processes.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.11
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• pp.57-68
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• 2013

The market for distributed power generation based on renewable energy is increasing, particularly for standalone mini-grid applications in developing countries with limited energy resources. Stand-alone power systems (SAPS) are of special interest combined with renewable energy design in areas not connected to the electric grid. Traditionally, such systems have been powered by diesel engine generator sets (DEGS), but also hybrid systems with photovoltaic and/or wind energy conversion systems (WECS) are becoming quite common nowadays. Hybrid energy systems can now be used to generate energy consumed in remote areas and stand-alone microgrids. This paper describes the design, simulation and feasibility study of a hybrid energy system for a stand-alone power system. A simulated model is developed to investigate the design and performance of stand-alone hydrogen renewable energy systems. The analysis presented here is based on transient system simulation program (TRNSYS) with realistic ventilation load of a large store. Design of a hybrid energy system is site specific and depends on the resources available and the load demand.

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.703-707
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• 2001

A performance analysis of a SOFC/MGT hybrid system has been carried out for concept design. Thermo-dynamic models for each component being able to describe electrochemical characteristics and heat and mate-rial balance are proposed. Estimated is the power capacity of a SOFC suitable for the hybrid operation with a 5kW class MGT. Effects of current density and operating pressure are also investigated. Electric efficiency showed weak dependence on operating pressure and current density. It is desirable that the SOFC operates at high current density in manufacturing cost's point of view though operating with high current density slightly decreases the electric efficiency find specific power.