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도로터널 화재시 연기의 전파특성과 구조체에 미치는 영향에 관한 수치 해석적 연구
유지오,오병칠,김효규,Yoo, Ji-Oh,Oh, Byung-Chil,Kim, Hyo-Gyu 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.3
This study numerically considered the characteristic of smoke movement and the effect of hot smoke gas on tunnel wall surface temperature during road tunnel fire under boundary condition of fire growth curve that is applied to fire analysis in road tunnels. The maximum heat release rate were 20 MW and 100 MW and tunnel air velocities were 2.5 m/s and velocity induced by thermal buoyancy respectively, also the cooling effect of tunnel wall was considered. As results, when tunnel air velocity was constant at 2.5 m/s during tunnel fire, due to the cooling effect of tunnel wall, the smoke layer was rapidly descent after some distance and it flowed the same patterns at the downstream. When heat release rate was 100 MW (and jet fan was not installed), the maximum temperature of tunnel wall surface has risen up to $615^{\circ}C$. The heat transfer coefficient of tunnel wall surface was varied from 13 to $23W/m^2^{\circ}C$ approximately. 본 연구에서는 도로터널 화재해석에 적용하는 화재성장곡선을 적용하여 도로터널 화재시 열기류의 전파특성과 터널벽면에 미치는 열적특성을 수치 해석적으로 고찰하였다. 최대화재강도는 20, 100 MW로 하였으며, 터널내 풍속은 2.5 m/s로 유지하는 경우와 열부력에 의한 풍속으로 하는 경우에 대해서 터널연장 및 경사도에 따른 연기의 전파특성을 분석하고 열기류가 벽체에 미치는 영향을 평가하기 위해서 벽체표면온도와 벽체표면 열전달계수를 분석하였다. 터널내 열기류는 풍속을 2.5 m/s로 하는 경우에 벽체의 냉각효과에 의해서 일정거리 이후에는 급격하게 하강하여 하류까지 동일한 양상으로 흐르는 특성을 보이고 있으며, 벽체표면의 최대온도는 화재강도가 100 MW일 경우에 최대 $615^{\circ}C$까지 상승하고 있으며, 표면온도가 $380^{\circ}C$를 초과하는 면적은 아주 작은 것으로 나타나고 있다. 벽체의 표면열전달계수는 화재강도 및 터널내 풍속에 따라서 변하며 약 $13{\sim}23W/m^{\circ}C$의 범위에 있는 것으로 나타났다.
김종현(Kim Jong-Hyun),오병칠(Oh Byung-Chil),신우철(Shin U-Cheul),백남춘(Baek Nam-Choon) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
The purpose of this paper is to investigate the application of solar thermal systems to the apartment. The calculation was performed for two systems: solar hot water system and solar space heating system. And the simulation was carried out using the thermal simulation code TRNSYS, of which results were verified the its reliability by the experimental ones. As a result, it was anticipated that the solar space heating can apply to two households with 105 square meters and the solar hot water system can supply about 55% of hot water load for nine household applications.
서울지역 고등학교 건물의 에너지소비특성에 관한 사례분석
김성범(Kim Sung-Bum),오병칠(Oh Byung-Chil),신우철(Shin U-Cheul) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.6
In this study, we analyzed five-year(2011~2015) data for D high school in Seoul area to analyze energy consumption characteristics in high school. The results are summarized as follows. (1) In the result of comparison analysis about 2015 energy consumption by usage, based on primary energy, 18% of energy was consumed in cafeteria, and 82% was consumed in main building. In the case of main building, base and constant load excepting hot water supply in restroom took 40%, heating including freeze protection took 20%, hot water supply in restroom took 14%, and cooling took 8% in order. (2) In the 2015 total energy consumption in D high school based on primary energy, heating energy takes 28%. The range and limit of energy savings coming from the reinforcement of insulation and window performance could be estimated. (3) To introduce new & renewable energy system in high school, electricity-based system is suitable than heat-based system because usage of electric energy is larger than that of heat energy in high school. (4) Five-year energy consumption unit according to heating degree-day showed a linearly increasing trend, and the coefficient of determination(R2) was 0.9763, which means high correlation.
이왕제(Wang-Je Lee),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee),오병칠(Byung-Chil Oh),신우철(U-Cheul Shin) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.7
To fulfill the demands concerning energy efficiency for zero energy buildings, various technologies of architects and engineers are required. This study aims to estimate the thermal performance of heat source equipment in which part load characteristics are considered in an office building. Overestimation of heat source equipment was reviewed through literature survey, and heating and cooling loads depending on the capacity and division of the equipment were analyzed through a simulation program (DOE-2.1E). The conclusions gained from this study are as follows; 1) The more the division of equipment, the less the heating and cooling energy consumption. 2) When a large item of equipment is divided into two small items of equipment, the optimum application rate showed as 5:5 for chiller, and 7:3 for boiler, respectively.
이왕제(Wang-Je Lee),강은철(Eun-Chul Kang),이의준(Euy-Joon Lee),오병칠(Byung-Chil Oh),신우철(U-Cheul Shin) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.10
This study investigated the total energy consumption and the energy consumption by type of 31 apartment complexes in Daejeon. The energy is supplied to the apartments from district heating, and can be divided into hot water, electricity, and gas. Hot water is used in for space heating and for domestic hot water (DHW), and electricity is used for plugs, cooling, ventilation, and public utilities (street lights, pumps, elevators, etc.). All gas supplied from district heating is used for cooking. As a result, the consumption unit of each energy source of independent dwelling areas was calculated to be 103.7 kWh/㎡?a (15,692 kWh/H?a) for thermal energy, 48.0 kWh/㎡?a (4,646 kWh/H?a) for electricity, and 10.5 kWh/㎡?a (1,015 kWh/H?a) for gas, so the entire consumption was calculated to be 162.3 kWh/㎡?a (15,692 kWh/H?a).
오병칠 신한대학교 2020 신한대학교 논문집 Vol.43 No.
For the purpose of energy saving for heating and cooling in high school building, this case study investigated the real energy usage by record and field instrumentation, predicted the usage by simulation with high school design drawing in Gincheon innovation city, and compared and analyzed cooling and heating load which change according to building permeability and window-grade. Drawn conclusions are as follows. 1. In the distribution of cooing load of high school, the heat generation from lights takes 40 % of it; therefore reducing the load from lights, which takes major part of the entire load, would be the most effective way to reduce cooling load. That is, reducing the heat generation from lights is most important to save cooling energy. 2. By reducing number of air change per hour due to infiltration from 5 times to 3 times, entire cooling and heating load is reduced by approximately 25%, and thermal losses due to infiltration are reduced by approximately 48%; therefore reducing infiltration is important to save cooling and heating energy, and it is more efficient in saving heating energy than saving cooling energy. That is, reducing thermal losses due to infiltration in winter is most important to save heating energy. 3. As a result of analysis of heating and cooling load due to alteration of performance of window, using 2nd-grade window is advantageous in cooling and disadvantageous in heating compared to using 3rd-grade window, as the SHGC gets less; the entire cooling and heating load decreases by 1.4%. Therefore raising the window grade is not so efficient to save cooling and heating energy. By the way of energy saving method drawn by this process, the building energy saving is practicable, and it is available in the way of the optimal design of new and recycle energy for the efficient energy supply later.