http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박희용,박신배 한국태양에너지학회 1985 한국태양에너지학회 논문집 Vol.5 No.1
In this study, heat transfer and flow characterics by laminar natural convection in a two dimensional partitioned enclosure were studied numerically. The enclosure was consisted of two vertical side walls, two partitions fixed to the ceiling and the floor and a long partition between the fixed partitions. It was assumed that the vertical side walls were isothermal and all the other surfaces were insulated. The governing equations for a fully buoyancy-driven-flow were solved by means of Elliptic SIMPLE finite difference method. Under steady condition, temperature, velocity, pressure and flow field were obtained at different sizes and locations of partitions over the range of Grashof numbers between 10⁴ and 10^7. As the result of this study, it was found that, increasing a long partition size, by enlarging its width. decreased the average heat transfer across the enclosure and the total heat transfer was reduced when the partitions were moved close to the side walls.
부분밀폐공간내에서 화재로 야기되는 열 및 유동특성에 관한 연구
박희용,한철희,박경우 대한기계학회 1994 대한기계학회논문집 Vol.18 No.5
Mathematical modeling and numerical calculation on the flow and thermal characteristics induced by fire in a partial enclosure are performed. The solution procedures include the Shvab-Zeldovich approximation for the physical transport equations, low Reynolds number k-.epsilon. model for the turbulent fluid flow and Discrete Ordinate method(DOM) to calculate the radiative heat transfer. PMMA(Polymethylmethacrylate) is adopted as a solid fuel. Two different cases are considered : combustions with and without gas radiation occuring in a open cavity for variable pyrolyzing location of PMMA. When the fire source is located at the left-wall, the flow region of flame gas is limited at the left-wall and ceiling and recirculation region of inlet gas is formulated at neat the floor. In case of neglecting the radiative heat transfer, more large flame size and higher temperature is predicted. It is essential to consider the radiative heat transfer for analysis of fire phenomenon.
박희용,박경우,차재병 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9
In this study, the computer modeling for prediction of the performance of fin-tube heat exchanger using alternative refrigerant, HFC-134a was developed and the computer program for calculating the various properties of HFC-134a and the existing refrigerant CFC-12 and HCFC-22 was made. The heat exchanger modeling is based on a tube-by-tube approach, which is capable of analysis for the complex coil array. Performance of each tube is analyzed separately by considering the cross-flow heat transfer with external airstream and the appropriate heat and mass transfer relationships. A performance comparison according to the different refrigerants is provided using this developed model. As the result of this study, total heat transfer rate of evaporator and condenser using HFC-134a were found higher than that of using CFC-12 for the same operating conditions. When the mass flow rate of HFC-134a was less than CFC-12 about 18. 16%, the cooling capacities of evaporator were found to be the same.
학회순례 - 71년 창립, 회원 3천3백여명 규합 '공기조화냉동공학회'
박희용,Park, Hui-Yong 한국과학기술단체총연합회 1999 과학과 기술 Vol.32 No.7
1971년 9월 공기조화, 냉동, 위생, 환경과 각종 설비에 관한 학문적 연구와 기술발전을 위해 창립한 공기조화냉동공학회는 현재 3천3백여명이 똘똘 뭉쳐 모범적으로 학술활동을 펼치고 있다. 해마다 학회지 6회, 논문집 6회, 영문논문집 2회를 발간하는 등 96년에는 창립 25돌을 맞아 '온돌'을 주제로 국제학술대회를 열었으며 30돌인 2001년에도 국제학술대회 유치를 계획하고 있다.
캐비티내에서 표면복사를 고려한 2차원 층류 자연대류 열전달
박희용,박경우,한철희,Park, H.Y.,Park, K.W.,Han, C.H. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.3
A Numerical study on two-dimensional laminar natural convection with and without surface radiation in fully or partially open square cavity was performed. The cavity has one vertical heated wall facing a vertical opening and two horizontal insulated walls. The pressure boundary condition was applied to the opening instead of the velocity boundary condition. The results of this study showed that the increase of partition length decreased the convective and the radiative Nusselt numbers. It was also found that the increase of wall emissivity decreased the convective Nusselt numbers but increased the radiative Nusselt numbers.
박희용,박경우,Pak, H.Y.,Park, K.W. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.3
The Combustion gas behavior induced by fire in a building is numerically investigated. The typical building for this analysis is partially divided by a vertical baffle projecting from the ceiling. The solution procedure includes the low Reynolds number ${\kappa}-{\varepsilon}$ model for the turbulent flow and the discrete ordinates method is used for the calculation of radiative heat transfer equation. The effects of the location and size of fire source and baffle length on velocity and temperature distributions, species mass fraction and flame location are analyzed. As the results of this study, it is found that the case when the fire source is located at the vertical wall is more dangerous than at the bottom wall in view of the combustion products and flame location. It is also found that the radiation effect cannot be neglected in analyzing the building in fire.
박희용,임경빈 대한기계학회 1987 대한기계학회논문집 Vol.11 No.2
The behaviors of layers developed in a solar pond were studied by experimental and analytical methods. An experimental solar pond heated from below was constructed and operated at the net heat fluxes of 110 and 160W/m$^{2}$ and at the initial salt concentration gradients of 18.2, 27.3 and 36.4%/m. The thicknesses, growth rates, temperature and salt concentration in the top and the bottom mixed layers, the diffusive layer and the upper and the lower interfacial boundary layers were measured. The shadowgraph technique was used in order to observe all layer formation and an electroconductivity-temperature probe consisting of four electrodes was fabricated and used in measuring the salt concentration. Based on the experimental results, a model for the solar pond was developed and the governing equation and the assumptions were established. The governing equations were solved by the numerical method. The calculated results obtained from the analysis were compared with the experimental results. 본 논문에서는 하부가열식 실험용 태양연못을 제작하여 열유속과 초기의 소금 농도구배를 변화시켜 가면서 실험을 수행하였다.실험을 통하여 측정한 각 층안의 온도와 소금농도구배 및 하부혼합층의 성장율 등을 바탕으로 지배방정식과 가정을 세 운뒤 이들 방정식을 풀어 실험테이터와 비교하였다.