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유상석(Sangseok Yu),이영덕(Youngduk Lee),안국영(Kookyoung Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A PEMFC(proton exchange membrane fuel cell) is a good candidate for residential power generation to be cope with the shortage of fossil fuel and green house gas emission. The attractive benefit of the PEMFC is to produce electric power as well as hot water for home usage. Typically, thermal management of vehicular PEMFC is to reject the heat from the PEMFC to the ambient air. Different from that, the thermal management of PEMFC for RPG is to utilize the heat of PEMFC so that the PEMFC can be operated at its optimal efficiency. In this study, dynamic thermal management system is modeled to understand the response of the thermal management system during dynamic operation. The thermal management system of PEMFC for RPGFC is composed of two cooling circuits, one for controling the fuel cell temperature and the other for heating up the water for home usage. Dynamic responses and operating strategies of the PEMFC system are investigated during load changes.
단순모델을 이용한 막 가습기 열 및 물질 전달 특성 해석
유상석(Sangseok Yu),이영덕(Youngduk Lee),배호준(Hojune Bae),황준영(Joonyoung Hwang),안국영(Kookyoung Ahn) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.8
The performance of proton exchange membrane fuel cell (PEMFC) is seriously changed by the humidification condition which is intrinsic characteristics of the PEMFC. Typically, the humidification of fuel cell is carried out with internal or external humidifier. A membrane humidifier is applied to the external humidification of residential power generation fuel cell due to its convenience and high performance. In this study, a simple static model is constructed to understand the physical phenomena of the membrane humidifier in terms of geometric parameters and operating parameters. The model utilizes the concept of shell and tube heat exchanger but the model is also able to estimate the mass transport through the membrane. Model is constructed with FORTRAN under Matlab/Simulink<SUP>®</SUP>□ environment to keep consistency with other components model which we already developed. Results shows that the humidity of wet gas and membrane thickness are critical parameters to improve the performance of the humidifier
대면적 셀 고분자 막전해질 연료전지의 열관리를 위한 2 차원 수치 해석 모델
유상석(Sangseok Yu),이영덕(Youngduk Lee),안국영(Kookyoung Ahn) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.5
A two-dimensional thermal model of proton exchange membrane fuel cell with large active area is developed to investigate the performance of fuel cell with large active area over various thermal management conditions. The core sub-models of the twodimensional thermal model are one-dimensional agglomerate structure electrochemical reaction model, one-dimensional water transport model, and a two-dimensional heat transfer model. Prior to carrying out the simulation, this study is contributed to set up the operating temperature of the fuel cell with large active area which is a maximum temperature inside the fuel cell considering durability of membrane electrolyte. The simulation results show that the operating temperature of the fuel cell and temperature distribution inside the fuel cell can affect significantly the total net power at extreme conditions. Results also show that the parasitic losses of balance of plant component should be precisely controlled to produce the maximum system power with minimum parasitic loss of thermal management system.
가정용 연료전지 시스템의 열관리 해석을 위한 시스템 운전 모델 개발
유상석(Sangseok Yu),이영덕(Youngduk Lee),안국영(Kookyoung Ahn) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.1
이온교환막 연료전지는 전세계적인 에너지 고갈 문제와 온실효과에 대한 대응책의 하나이다. 특히, 이온교환막 연료전지는 전기화학반응에 의해 전기를 생산함과 동시에 열을 발생하기 때문에 가정용으로 적용하기에 적당하다. 가정용 연료전지의 열관리 목적은 연료전지가 최적조건에서 운전할 수 있도록 적절히 온도를 제어해 주는 것으로, 본 연구에서는 부하 변화 시 가정용 연료전지 시스템의 응답 특성과 열관리 특성을 알아보기 위한 해석 모델을 개발하였다. 열관리 해석 모델은 연료전지의 온도를 조절하기 위한 펌프와 열교환기로 구성된 1차측, 주택에 온수를 공급하기 위한 탱크와 펌프 계통의 2차측으로 구성되었다. 부하를 순차적으로 증가시킬 때와 감소시킬 때를 구분하여 열관리 계통의 응답특성을 확인하였다. 결과적으로 탱크의 초기 승온에 많은 시간이 소요되기 때문에 부하를 다단으로 오랜 시간 동안 서서히 증가시키면서 시스템 응답 특성을 확인하였다. 또한, 본 연구에서는 가정용 연료전지의 부하 변화시의 열관리 특성을 고려한 운전 전략에 대해서도 조사하였다. A PEMFC(proton exchange membrane fuel cell) is a good candidate for residential power generation to be coped with the shortage of fossil fuel and green house gas emission. The attractive benefit of the PEMFC is to produce electric power as well as hot water for home usage. The thermal management of PEMFC for RPG is to utilize the heat of PEMFC so that the PEMFC can be operated at its optimal efficiency. In this study, thermal management system of PEMFC stack is modeled to understand the dynamic response during load change. The thermal management system of PEMFC for RPGFC is composed of two cooling circuits, one for controling the fuel cell temperature and the other for heating up the water for home usage. The different operating strategy is applied for each cooling circuit considering the duty of those two circuits. Even though the capacity of PEMFC system (1kW) is enough to supply hot domestic water for residence, heat-up of reservior takes some hours. Therefore, in this study, time schedule of the simulation reflects the heat-up process. Dynamic responses and operating strategies of the PEMFC system are investigated during load changes.
가역적 고온 고체산화물 연료전지-수전해 시스템 성능해석
강상규(Sanggyu Kang),이상호(Sangho Lee),김영상(Youngsang Kim),이영덕(Youngduk Lee),안국영(Kook-Young Ahn) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Various types of the energy storage system (ESS) have been developing to compensate for the renewable power generation. The objective of the study is to develop the novel renewable hybrid system composed of the reversible solid oxide fuel cell (SOFC)/solid oxide electrolyser cell (SOEC) system and waste steam. In case of SOEC operation mode, the surplus electricity and the steam of 3 bar and 750 ℃ are supplied to the SOEC system to generate the hydrogen. The steam is generated by the boiler using the solid refuse fuel (SRF). The generated hydrogen is de-humidified by flowing through the heat exchanger and dryer, then heated and compressed to be stored at the metal hydride. In case of the SOFC operation mode, the hydrogen from the metal hydride enters to the SOFC system to generate the power. In order to improve the system efficiency, the off gas from the hydrogen electrode of the SOFC/SOEC system is recirculated by regenerative blower or ejector. And the system exhaust heat could be used for the hydrogen storage/release. The system analysis has been conducted to determine the system efficiency by Aspen Plus®. In order to achieve the system optimization, the efficiency of the various system configurations have been compared.