汚染物質 放出量 측정챔버 製作 및 輕量칸막이벽의 VOCs 放出特性

방승기(Seung-Ki Pang),손장열(Jang-Yeol Sohn),백용규(Yong-Kyu Baik),조현(Hyun Cho) 한국생활환경학회 2004 한국생활환경학회지 Vol.11 No.1

In this research, the purpose was to understand the emission characteristics of VOCs from lightweight panel in different experimental condition, in order to compare and evaluate VOCs emitting from indoor construction materials in buildings. (l) First of all, we analyzed the problems related to the present measurement systems for VOCs, made a new measurement system, and verified the performance of the system. (2) With the new measurement system, we evaluated the emission rate of VOCs which is the basic material composing lightweight panel. (3) After we made various types of lightweight panel using the materials selected in process (2), we compared and evaluated the emission rate of VOCs in different temperature (20℃, 28℃), relative humidity (40%, 60%), and air exchange rate (0.5 time/h, 0.7 time/h) condition. We acquired the following conclusion as a result of the experiment. In case of constant temperature and relative humidity condition, the emission rate of VOCs from general oil paint was 250 times higher than that from vegetable water paint. As air exchange rate, temperature, and relative humidity rose, the emission rate of VOCs rose simultaneously. In case of the experiment of lightweight panel, the emission rate of Type Ⅰ composed of general paint and general adhesive was higher than that of Type Ⅱ, Ⅲ, Ⅳ. Therefore, it would be well-advised to use vegetable paint, vegetable adhesive, and general water paint for the improvement of Indoor Air Quality.

설계단계에서 건축물의 종합성능 평가

방승기(Seung-Ki Pang),백용규(Young-Gyu Baik),이철구(Chul-Goo Lee),조현(Hyun Cho) 한국생활환경학회 2005 한국생활환경학회지 Vol.12 No.4

We carried out this research in order to examine life-time cost of the building after its completion, its acoustical performance, and the time required for evacuation in the event of a fire. Our research was based on the data obtained from buildings for teenagers. We obtained the following results. First, the analysis of the total cost estimates showed that the most economical case was the case when we used a hot and chilly water generator. Second, the simulation results from an auditorium experiment indicated that the reverberation time at 500 ㎐ was 1.34 seconds when all seats were not occupied whereas it reached 1.1 seconds when all seats were occupied. The differences between the calculated RTs and target RTs were respectively 0.04 and 0.02 seconds. Third, we found that the sound pressure level was relatively uniform because it was located within 4 ㏈. Fourth, simulation results showed that the ZONE 3 turned out to be most effective because its occupants were able to go through each emergency exit within regulated time.

CFD와 TDR을 이용한 고층 공동주택의 결로 판정 도구 개발

방승기(Seung Ki Pang),김철현(Chul Hyun Kim) 한국지열·수열에너지학회 2013 한국지열에너지학회논문집 Vol.9 No.4

On this Thesis, We conduct a research of curtain wall high-rise apartment located in Songdo for preparing a simple method to check possibility of condensation on each part of curtain wall using only indoor temperature, humidity and outdoor temperature. According to CFD analysis result, condensation occurred if indoor environment did not ventilated. On the other hand, in case of ventilation on indoor environment, condensation did not appear; so I could find ventilation prevent surface condensation on inside surface of curtain wall. Moreover, when temperature of the floor is higher, condensation is decrease more than lower floor temperature.

수치해석을 이용한 바닥공조 시스템의 공기환경 평가

방승기(Seung-Ki Pang),안혜린(Hye-Rin Ahn),이원근(Won-Keun Lee),문기선(Ki-Sun Moon),김종률(Jongryul Kim),이광호(Kwang-ho Lee) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.4

In order to improve air quality of indoor environment, studies of the underfloor air distribution (UFAD) system for application in buildings are actively in progress based on temperature and air flow distribution. However, although the age of air is the major evaluation parameter, there has been very little study on this parameter for the UFAD system. In this study, we investigated the age of air to reach the air diffuser, which is installed at the bottom of the interior by the UFAD system. Computational fluid dynamics simulations showed no regular pattern to the maximum value of the age of air in accordance with air flow rate and the velocity at air diffuser. These factors can be deduced from air movement by considering that air emitted from air conditioners was rotated according to the bottom shape of the floor, and then, the age of air in the rotation center was increased. The average age of air of internal interior was reduced considerably as the flow velocity at the underfloor air diffuser was increased from 0.5 m/s to 1.0 m/s However, the age of air was not substantially affected with change in the air volume. Moreover, when the flow velocity at the underfloor air diffuser was higher than 1.0 m/s, the age of air showed no significant difference with change in air volume or height of measurement. These results imply that indoor air quality is more substantially influenced by flow velocity than air volume, and the appropriate flow velocity is 1 m/s or more.

어린이 전용병원의 열원설비 대안별 Life Cycle Cost 분석

방승기(Seung-Ki Pang),채영태(Young-Tae Chae),이철구(Chul-goo Lee) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1

By increasing energy resource cost, the annual energy consumption for a HVAC has been an important factor as well as an initial cost of mechanic system to select a primary plant system. Hence, Life Cycle Cost (LCC) analysis is inevitable and needs to evaluate the efficiency of plant system. In this study, an economical efficiency of various plant system was validated to present the optimized plant solution for the new hospital for children. An annual HVAC energy consumption was calculated by energy simulation program (DOE 2.lE) and an economic efficiency of each plant system evaluated by LCC analysis method. The essential conclusions of this study are as follows; I) Because of many specific rooms which need 24 hour HAVC, energy consumption per area of the design building is higher than other buildings, 2) A totally hot and chilled water generator (HCWG) system (ALT-I) is the most profitable system in the point of initial cost, However 3) Considering a annual gross energy bill, which is fluctuated by energy source type and a initial cost of system, a composit system (ALT-2), a coupled system by an ice storage system and a HCWG system, is more effective than other systems during system life cycle, 4) A totally absorption system (ALT-3) has no merits of installing the plant system in the point of initial and running cost. Consequently, it is revealed that a composit system (ALT-2) is the most economical plant system for the new constructed building.

도파관 배열이 설치된 비상발전기 연도의 유속 예측 및 EMP 차폐평가

방승기(Seung-Ki Pang),김재훈(Jae-Hun Kim),육종관(Jong-Gwan Yook),김유나(Yuna Kim),김상인(Sangin Kim),김석봉(Suk-Bong Kim) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.1

Characteristics of exhaust from chimney of electricity generator are analyzed based on CFD when Waveguide-Below-Cutoff (WBC) array is installed in order to achieve the certain level of electromagnetic pulse (EMP) shielding. The main purpose is prediction of average and maximum velocity of exhaust. The results reveal that: 1) When the specification of waveguide is given as 80-diameter, 400-length, and the gap of 20 mm, the shielding effectiveness (SE) is 140dB. The average and maximum velocity of exhaust in the chimney with WBC Array can be represented as exponential functions. 2) As the number of WBC increases, the velocity in the chimney dwindles. 3) Under the situation that WBC with 80 mm diameter is located at intervals of 20 mm, the average velocity can be approximated by 25.5344 × e<SUP>(−0.0098 × NWBC)</SUP> with input velocity of 15 m/s. In addition, the determination coefficient is 0.915, which is sufficiently high.

EMP 차폐를 위한 비상발전기 연도의 최적 형상 결정

방승기(Seung-Ki Pang),김재훈(Jae-Hun Kim) 한국에너지학회 2015 에너지공학 Vol.24 No.4

환기 및 Bake-Out에 의한 하절기 신축공동주택의 휘발성유기화합물 농도 저감효과 평가

방승기(Seung-Ki Pang) 한국생활환경학회 2009 한국생활환경학회지 Vol.16 No.2

This study investigated how the concentration effects in volatile organic compounds (VOCs) in newly built apartments could be effectively reduced in summer. Four types of ventilation experiments such as close-up, natural ventilation, mechanical ventilation, and temporary ventilation(mechanical ventilation + bake-out) have been carried out for seven days in four representative households. Each experiment was evaluated by measuring concentration reduction effect per day, along with its daily concentration rate. Measurement indexes were based on Benzene, Toluene, Ethylbenzene, Xylene, Styrene and Formaldehyde. Evaluation results were as follows. Using more than two plans simultaneously by dividing stages proved to be a more efficient way of reducing indoor VOCs than using only one plan. In addition, proper mixes or application of plans such as bake-out with temporary ventilation, bake-out with natural ventilation or with machine ventilation turned out to be a more efficient way of reducing concentration of indoor VOCs in the apartments.

설계단계에서 Multiplex Cinema의 화재 및 피난 성능 평가

방승기(Seung-Ki Pang),안창환(Chang-Hwan Ahn),채영태(Young-Tae Chae) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1

In this study, It is need a phased approach which divided three steps to estimate a appropriate time for evacuating when the fire is occurred in a theater at the Multiplex cinema. First of all, the present status data of the Multiplex Cinema in Korea is collected by statistics to perceive the conditions of the building type. The geometry data and the basic condition on a fire simulation are analyzed. In addition, the simulation research is conducted to predict critical items such as a height of the smoke, fluctuations of the indoor air temperature and optical density, when the fire is ignited a certain position in the theater. Finally, a required evacuation time for total occupants in the building is estimated by SIMULEX to evaluate the location and size of the exit and the distances for evacuation. As the results, the target building could satisfy the several limitations for the occupant's evacuation.

EMP 차폐를 위한 도파관 형상과 SE에 따른 유동 특성 평가

방승기(Seung-Ki Pang),안혜린(Hye-Rin Ahn),육종관(Jong-Gwan Yook) 한국지열·수열에너지학회 2016 한국지열에너지학회논문집 Vol.12 No.3

In this study, we evaluated the flow characteristics of various types of waveguide-below-cutoff (WBC) arrays and their shielding effectiveness (SE) of electromagnetic pulses (EMP) based on computational fluid dynamics (CFD). Three types of waveguides were selected for analysis: (1) grid type, (2) honeycomb type, and (3) multi-layer types (2-ply, 4-ply, 6-ply, and 8-ply). To analyze the air flow characteristics, the flow velocities in the longitudinal center of the WBC and the differential pressures between the WBC array inlet and outlet were evaluated. Consequently, we derive the following conclusions: (1) despite an increase in the inlet velocity, the pressure drop of the 6-ply multi-layer type did not significantly increase as compared to that of other types of waveguides (waveguide thickness of 0.1 mm, SE of 100 dB); (2) the grid and honeycomb type had the fastest flow rate of 17.5 m/s, which is approximately 2.5 m/s faster than that at the inlet (waveguide thickness of 1 mm, module size of 30 mm); and (3) the average pressure drop of the grid type waveguide is the lowest in the overall model, whereas that of the 8-ply is the highest (waveguide thickness of 1 mm, module size of 30 mm, and SE of 80, 100 dB).