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김종훈,박원희,김운형,명상엽,Kim, Jong-Hoon,Park, Won-Hee,Kim, Woon-Hyung,Myoung, Sang-Yup 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.1
연구목적: 본 연구는 미분무 소화설비의 FDS모델링 수행에 있어 액적과 관련된 변수의 설정 변화가 살수밀도에 미치는 영향을 알아보았다. 연구방법: 미분무 노즐의 살수 현상을 FDS에서 해석할 경우 액적과 관련하여 설정할 수 있는 항목 중 초당액적수, 액적속도, 입경분포함수, 분사패턴형태의 값을 입력하여 분석된 결과를 검토하였다 연구결과: 분석결과에서, 초당미립자 수 설정은 일정 값 이상이 되면 유사한 바닥면의 살수밀도를 보여주었다. 액적속도는 낮아짐에 따라 중심부분의 살수밀도를 높이지만 0.15m 이상 떨어진 거리에서는 낮아짐을 알 수 있었다. 입경분포함수의 변화에 대한 분석에서, 𝛾값의 증가는 중심부분의 살수밀도의 증가를 가져오지만, 떨어진 위치에서의 값은 감소를 가져온다는 점을 알 수 있었다. 가우시안 분포를 적용한 결과에 비하여 균등분포를 적용하는 경우 중앙값은 극적으로 낮아지지만 인접위치에서의 값은 증가함을 보여준다. 결론: FDS의 액적특성에 관련된 변수들은 각각 바닥면의 살수밀도에 영향을 준다. 그러므로 화재 진압이나 냉각 등의 해석에 들어가기 전 신뢰성을 확보하기 위하여 입력변수에 대한 면밀한 검토가 필요하다. Purpose: In this study, the effect of changes in the variables related to water droplets on the spray density on the floor in the analysis of the water mist fire protection system using FDS was analyzed. Method: When the spray of the water mist nozzle was analyzed in FDS, Particles Per Seconds, Particle Velocity, Size Distribution, and Spray Pattern Shape that can be set in relation to droplets were input to review the analyzed results. Result: In the analysis results, when the number of particles per second was set above a certain value, the spray density of the floor was similar. In the case of Particle Velocity, as the velocity decreases, the spray density of the central portion increases but decreases at a distance of 0.15m or more. From the analysis of the change in the size distribution function, it was found that an increase in the 𝛾 value increases the spray density of the central part, but the value at a remote location decreases. Compared to the result of applying the Gaussian distribution, the median value decreases dramatically when the uniform distribution is applied, but the value at the adjacent position increases. Conclusion: Variables related to the droplet properties of the FDS affect the spray density of the floor. Therefore, in order to increase the reliability of results before performing analyses such as fire suppression or cooling, a sufficient review of input variables is required.
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박원훈,이시우,박원희 ( Won Hoon Park,Shi Woo Rhee,Won Hee Park ) 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.2
The solar energy is presently the most promising as an alternative energy source, and R&D activities on its utilization are reviewed to provide a stimulant for similar efforts in energy-importing Korea. The so-called low, temperature utilization such as solar space heating and cooling, greenhouse, solar still and solar dehydration is more emphasized as practical means of implementation in developing countries. Whereas sophisticated solar thermal power generation employing solar concentration principle, heliochemical and helioelectric researches are briefly reviewed. Part I discusses the systematic classification of solar energy utilization, flat-plate solar collector upon which solar energy economics depends mostly, and the simplest system made of this collector, namely, solar water heater.
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태양에너지 활용연구 2 . 태양열난방과 냉방 , 태양증발기 , 온실 및 태양열건조
박원훈,이시우,박원희 ( Won Hoon Park,Shi Woo Rhee,Won Hee Park ) 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.3
Solar residential heating and cooling, solar stills producing potable water, greenhouse and solar dehydration as agricultural applications are reviewed with an emphasis on similar R & D activities in Korea. These phases of solar energy utilization at low temperature are considered the most attractive as practical means. Solar space heating and solar stills are already in operation in many localities competing with conventional methods. As for greenhouse and solar dehydration research efforts are concentrated on effective energy management by reducing heat loss and cost-effective system development, respectively. Technical details of solar space cooling are still under tests. Solar energy utilization at high temperature will be reviewed in part Ⅲ of this series.
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태양에너지 활용 연구 3 . 집광집열기 , 태양열발전 및 태양광발전
박원훈,이시우,박원희 ( Won Hoon Park,Shi Woo Rhee,Won Hee Park ) 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.4
In this last part of review series intermediate and high temperature application of solar concentrator, solar thermal power generation, and solar photovoltaic conversion are described. At higher temperatures efficient and large-scale industrial utilization of solar energy are expected by generating electricity. However, since R&D works on these fields require large investment and highly advanced technology, economic and technical feasibility is not forseeable in the near future.
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박원희,이인철,박원훈,이현구 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.4
가정용 구멍탄과 동일한 조성을 갖는 석탄배합물을 대상으로 연소실험을 실시하여 그 연소특성을 규명하는 한편, 연소모델을 제시하고 그 해석 결과를 실험관측과 비교 검토하였다. 연소시료는 구형으로 성형하여 열천칭으로 감량곡선을 측정하였으며 반응온도, 공기의 공급유량 및 시료크기 등 주요인자들이 연소특성에 미치는 영향을 분석하였다. 미반응 석탄표면에서 일산화탄소의 생성, 회분층내에서 일산화탄소의 재연소반응과 각 성분에 대한 확산저항 그리고 입자 외부의 물질전달저항을 고려하여 수축핵 모델을 설정하고 이론적인 해석을 시도하였다. 모델해석의 결과는 실험관측과 어느 정도 일치되는 경향을 나타내었으나 비등온 효과를 고려하여 모델을 더 개선할 필요가 있음을 제시하였다. An experimental study was performed for the combustion of coal mixture having the same composition as the anthracite briquette in domestic use. A mathematical model was also proposed and the results of theoretical analysis were compared to the experimental results. The purpose here is to investigate the combustion characteristics of the anthracite briquette and to develop a relevant mathematical model. Using a spherical sample, we measured the weight change as a function of reaction time by virtue of a spring thermo-balance. Examined and discussed here are the effects of major parameters on the combustion characteristics such as reaction temperature, flow rate of air, and sample size. A shrinking core model was established by taking into account the generation of carbon monoxide on the surface of unreacted core, the oxidation of carbon monoxide in the ash layer and the diffusional resistance through the ash layer as well as the external mass transfer resistance. The result of model analysis reveals that, although the overall trend is in agreement with the experimental observations, it would be necessary to improve the model by considering the non-isothermal aspect of the combustion system.
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