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수치해석 및 CFD를 이용한 소형챔버내 복합건축자재의 오염물질 방출량 예측
김창남(Chang Nam Kim),이승복(Seung Bok Leigh),김태연(Taeyeon Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
In order to predict the indoor air pollutant, the VOCs emission rate is used through small chamber in the design process. However, the small chamber method has limitations as the convective mass transfer coefficient, the most important factor when predicting VOCs contamination of indoor air, is different between the small chamber result and the measured data in the actual building. Furthermore, the existing studies which analyzed mass transfer coefficient in the small chamber were directed on the small chambers developed at the time and FLEC(Field and Laboratory Emission Cell), thus, are different from the current small chamber which has been changed with improvements. The purpose of this study is to determine the emission rate of pollutant in double-layered building materials through the CFD(Computational of Fluid Dynamics) and Numerical analysis based on the mass transfer coefficient on singled-layered building material by using the current small chamber widely used in Korea. Futhermore, this study used the new convective mass transfer coefficient(h<SUB>m</SUB>') which indicates the existing convective mass transfer coefficient(h<SUB>m</SUB>) including VOC partition coefficient(k). Also, formaldehyde was selected as target pollutant.
최원석(Wonsuk Choi),김재운(Jea Woon Kim),김종형(Jong Hyeong Kim),김주한(Joohan Kim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.1
LIFT(Laser-Induced-Forward-Transfer) 공정은 선택적으로 마이크로 크기의 물질을 이동시키는데 사용할 수 있는 레이저 공정이다. 본 연구에서 이 공정은 전자부품의 마이크로 시스템 패키징을 위한 솔더볼의 적층을 위해 적용되었다. 레이저 펄스에 의해 국부적으로 녹은 솔더 페이스트는 단단한 기저부분에 이동 적층되었다. 솔더 크림층을 지닌 박판유리플레이트가 도우너 필름으로 사용되었고 1070nm 파장의 IR 레이저 펄스를 조사하여 리셉터에 마이크로 솔더를 이동적층하였다. 물질 및 에너지 평형 방정식 등이 솔더 페이스 드롭의 모양과 온도 분포를 분석하기 위해 적용되었다. 실제 실험에서 얻어진 이동적층된 솔더 범프는 30~40 ㎛의 직경과 50 ㎛의 두께를 가진 것으로 측정되었다. 본 공정의 한계 및 적용에 대해서도 논의한다. LIFT (laser-induced forward transfer) is an advanced laser processing method used for selectively transferring micron-sized objects. In our study, this process was applied in order to deposit solder balls in microsystem packaging processes for electronics. Locally melted solder paste could be transferred to a rigid substrate using laser pulses. A thin glass plate with a solder cream layer was used as a donor film, and an IR laser pulse (wavelength = 1070 nm) was used to transfer a micron-sized solder ball to the receptor. Mass balance and energy balance were applied to analyze the shape and temperature profiles of the solder paste drops. The transferred solder bumps had measured diameters of 30?40 ㎛ and thicknesses of 50 ㎛ in our experiment. The limits and applications of this method are also presented.
수치해석을 활용한 합판마루 바닥재의 VOCs 방출에 관한 연구
김지혜,강동화,최동희,김선숙,여명석,김광우 대한설비공학회 2005 설비공학 논문집 Vol.17 No.12
The floor material is known as the most influential emission source of the residential building, because most floor material is made of wood compound and adhesive like a plywood flooring. Moreover, floor heating system keeps the inside temperature of the material high. As the emission of hazardous chemical compound from the construction material is influenced by many factors, it is necessary to analyze the emission characteristics of the floor material to improve IAQ. In this study, numerical analysis is performed to investigate the emission characteristics of the floor material affected by several factors such as temperature, air exchange rate, initial concentration, and internal diffusion coefficient. A simulation program is also written based on the mass transfer theory. The simulation results show that there is some level of difference on the TVOC concentration when each of the factors is variable.
복합 건축자재의 물질전달계수를 이용한 실내 오염물질 농도 예측방법
김창남(Kim Chang-Nam),이윤규(Lee Yun Gyu),이승복(Leigh Seung Bok),김태연(Kim Tae Yeon) 한국건축친환경설비학회 2007 한국건축친환경설비학회 논문집 Vol.1 No.2
In order to predict the indoor air pollutant, the VOCs emission rate is used through small chamber in the design process. However, the small chamber method has limitations as the convective mass transfer coefficient, the most important factor when predicting VOCs contamination of indoor air, is different between the small chamber result and the measured data in the actual building. Furthermore, the existing studies which analyzed mass transfer coefficient in the small chamber were directed on the small chambers developed at the time and FLEC(Field and Laboratory Emission Cell), thus, are different from the current small chamber which has been changed with improvements. The purpose of this study is to determine the emission rate of pollutant in double-layered building materials, and predict the indoor pollutant concentration through the CFD(Computational of Fluid Dynamics) and CRIAQ2 based on the mass transfer coefficient on singled-layered building material by using the current small chamber widely used in Korea. Futhermore, this study used the new convective mass transfer coefficient(hm') which indicates the existing convective mass transfer coefficient(hm) including VOC partition coefficient(k). Also, formaldehyde was selected as target pollutant.
20L 소형 챔버를 이용한 흡착분해 저감 건축자재 실험법
김훈(Kim Hoon),타나베 신이치(Tanabe Shin-ichi),아리가 타카오(Airga Takao),오자와 아키히사(Ozawa Akihisa),모치다 케이고(Mochida Keigo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In Korea, the small chamber method complying with KS (Korean Standard) M ISO 16000-9, ISO 16000-9 and JIS A 1901 is usually used for emission test from building materials. Recently, there are increasing develpment and use of sorptive and degradation building materials, and test method of reduction performance of them is being required. In Japan, JIS A 1905-1, 2 was established Feb. 2007, but ISO and KS is not yet. Our group has developed the air flow control unit for 20L small chamber to evaluate reduction perfomance of sorptive building materials. Chamber performance was verified through measuring the air velocity near the surface of the test specimen and mass transfer coefficient when using the newly developed unit. At the end of this paper, chamber test results of two types of sorptive building materials were stated.
멀티스케일 복합 구조 기반 열-유체-에너지 전달 현상 제어
최원준(Wonjoon Choi),황하영(Hayoung Hwang),여태한(Taehan Yeo),신동준(Dongjoon Shin),서병석(Byungseok Seo),강성구(Sunggu Kang),이상준(Sang Jun Lee),서경범(Kyungbeom Seo),이재민(Jaemin Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Hybrid structures from nano-microscale to macroscale contribute to further manipulation of thermal-fluidic-energy transport making them useful in many applications. I will introduce ongoing researches utilizing thermal-fluidic-energy transports in hybrid structures. Topics will cover (1) Layer-by-Layer (LbL)-based coatings of porous structures for enhanced phase change heat transfer, (2) nanofluidic sensing of micro-nanomaterials using aqueous two-phase system, (3) active control of materials properties using structural and physicochemical transformation via the structure-guided combustion waves for the fabrication of energy materials, (4) local thermal energy control through thermal metamaterials using the manipulation of continuum heat transfer, (5) self-sustaining liquid-motion-sensing platform for continuous monitoring of dynamics using thermoelectrics and triboelectrics and (6) thermal analyses in hybrid systems, such as photo-thermal or electrical-thermal interaction.
고형물이 분포되어있는 상변화 물질의 용해시스템에서 초음파의 영향에 관한 실험적 연구
이재효,엄철준 건국대학교 산업기술연구원 1999 건국기술연구논문지 Vol.24 No.-
This paper presents experimental works on the ultrasonic influence during melting of phase change material(PCM) with solid powder. This study made experiments about four types, namely: 1) without ultrasonic vibration and solid powder 2) with ultrasonic vibration and without solid powder 3) without ultrasonic vibration and with solid powder 4) with ultrasonic vibration and solid powder. Experimental observations show that the ultrasonic vibration increases heat transfer in melting process but solid powder disturbs heat transfer.
Ir-192 10,000 Ci와 I-131 80 Ci 운반에 적합한 운반용기 구조 분석
박종한,홍진태,양태호,손광재 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.1
This transport cask for radioactive materials will be used in the Gijang reactor. It will transport the Ir-192 10,000 Ci or I-131 80 Ci. In this case, the safety evaluation, such as protection of leakage of radioactive material, and radiation shield should be carried out before it is used in the research reactor. The safety regulation requires various tests, such as water spray, free drop, penetration, and water immersion. But this paper considers only the regulations related with thermal-stress and drop impact under the normal conditions because it will be used only in the research reactor building. In this paper, coupled numerical analysis was performed using finite element simulation to investigate the effect of position of tungsten and lead to enhance the safety of transport cask. As a result of simulation, it was verified that the Tungsten-Lead structure is the most durable among the cases considered in the study with a viewpoint of thermal-stress and drop impact.