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김성철(Kim, Sung-Chul),박민수(Park, Min-Su),정승훈(Jung, Seung-Hun),윤석호(Yoon, Seok-Ho),김민수(Kim, Min-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
There is a close relation between the heat generation in the fuel cell stack and the fuel cell performance. In PEM fuel Gell vehicles, the stack coolant temperature is about 65?C, which is far lower than that for general automobile engine. Therefore, it is hard to release heat generated in the stack by using a radiator of limited size because of the reduced temperature difference between the coolant and the ambient air. In this study, indirect stack cooling system using CO₂ heat pump was designed and its stack cooling performance in releasing heat to the ambient was investigated. This work focuses on a series of processes that grasp the relation among the fuel cell power, the radiator capacity and the stack temperature. The purpose of this work is to find out a way to properly release sufficient amount of heat through the finite sized radiator, so that the stack power general ion can not be deteriorated due to the stack temperature increase. The optimization between the compressor power consumption and the fuel cel1 output power can be carried out to maximize the performance of fuel cell system.
김민수(Kim, Min-Soo),김성철(Kim, Sung-Chul),박민수(Park, Min-Su),정승훈(Jung, Seung-Hun),윤석호(Yoon, Seok-Ho) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.4
There is close relation between the heat generation in the fuel cell stack and the fuel performance. In PEM fuel cell vehicles, the stack coolant temperature is about 65?C, which is far lower than that for general automobile engine. Therefore, it is hard to release heat generated in the stack by using a radiator of limited size because of the reduced temperature difference between the coolant and the ambient air. In this study, indirect stack cooling system using CO₂ heat pump was designed and its stack cooling performance in releasing heat to the ambient was investigated. This work focuses on a series of processes that grasp the relation among the fuel cell power, the radiator capacity and the stack temperature. The purpose of this work is to find out a way to properly release sufficient amount of heat through the finite sized radiator, so that the slack power generation can not be deteriorated due to the stack temperature increase. The optimization between the compressor power consumption and the fuel cell output power can be carried out to maximize the performance of fuel cell system.
한국 상수리나무(Quercus acutissima)림의 분포와 군집구조 분석
김인택(In-Taek Kim),송민섭(Min-Sub Song),정승훈(Sung-Hun Jung) 한국생명과학회 2009 생명과학회지 Vol.19 No.3
본 연구는 우리나라에 분포하고 있는 상수리나무림을 대상으로 식물사회학적 조사를 통하여 상수리나무림의 군집을 분류하고 각 군집간의 상관관계, 잠재자연식생, 입지에 따른 상수리나무의 분포 양상 등을 분석하여 한국 상수리나무림의 특성을 밝히고자 한다. 1. 한국 상수리나무림의 군집구분은 1군단, 3군집, 3아군집, 3전형아군집으로 유형화되었다. Ⅰ. 상수리나무군단(Quercion acutissimae) A. 상수리나무-졸참나무군집(Quercetum serrato-acutissimae ass. nov.) A-1. 갈참나무아군집(Quercetum serrato-acutissimae quercetosum subass. nov.) A-2. 전형아군집(Quercetum serrato-acutissimae typicum subass. nov.) B. 상수리나무-신갈나무군집(Quercetum mongolicoacutissimae asso. nov.) B-1. 갈참나무아군집(Quercetum mongolico-acutissimae quercetosum subass. nov.) B-2. 전형아군집(Quercetum mongolico-acutissimae typicum subass. nov.) C. 상수리나무-서어나무군집(Carpino-Quercetum acutissimae asso. nov.) C-1. 갈참나무아군집(Carpino-Quercetum quercetosum subass. nov.) C-2. 전형아군집(Carpino-Quercetum typicum subass. nov.) 2. DECORANA에 의한 요인분석 결과 상수리나무-졸참나무군집은 저지대 산지, 상수리나무-신갈나무군집은 상대적으로 해발이 높은 지역의 산지대, 상수리나무-서어나무군집은 주로 계곡부에 형성되어 있음을 입증하고 있다. 그러나 각 군집들이 서로 혼재되어 있는 경우가 많아 그다지 명료하게 나타나지는 않았다. 이러한 결과는 상수리나무림의 대부분이 저지대 및 농경지 주변의 교란요인이 심한 지역에 분포하고 있기 때문으로 사료된다. 3. 상수리나무림의 잠재자연식생을 추정한 결과는 다음과 같다. 1) Quercetum serrato-acutissimae asso. nov. → Quercus serrata-Quercus aliena Community → Quercus serrata Community 2) Quercetum mongolico-acutissimae ass. nov. → Quercus mongolica-Quercus aliena Community → Quercus mongolica Community 3) Carpino-Quercetum acutissimae asso. nov. → Carpinus laxiflora-Quercus aliena Community → Carpinus laxiflora Community. This study has targeted Quercus acutissima forests in Korea and has classified the association between Quercus acutissima forests by using the phytosociological method. In addition, the correlation between each association, distribution, potential natural vegetation, and aspect of Quercus acutissima forest according to location have been analyzed to examine the characteristics of the Korean Quercus acutissima forests. Through factor analysis of DECORANA, it was revealed that Quercetum serrato-acutissimae forms in the basal zones of mountains, Quercetum mongolico-acutissimae is formed in the highlands, in the relatively high mountain area, and Carpino-Quercetum acutissimae is mainly distributed in valleys. However, this phenomenon is not very obvious, as each association structure is often mixed up. This result is caused by inhomogeneity of the Quercus acutissima forests, and most of it is distributed in basal zones or around farmlands where there are severe disturbance factors. The proposed potential natural vegetation of the Quercus acutissima forests in Korea is as follows; Quercetum serrato-acutissimae → Quercus aliena-Quercus serrata community → Quercus serrata community, Quercetum mongolico-acutissimae → Quercus aliena-Quercus mongolica community → Quercus mongolica community, Carpino-Quercetum acutissimae → Quercus aliena-Carpinus laxiflora community → Carpinus laxiflora community.