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장애물을 갖는 덕트내의 유동가시화 및 수치해석에 관한 해석
문찬,박진철,김철,Moon, C.,Park, J.C.,Kim, C. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.3
Laminar flow and heat transfer in a channel with blockages are obtained numerically in a Reynolds-number range of $100{\leq}Re{\leq}400$. A boundary-fitted curvilinear coordinate system is generated for irregular boundary of the physical region, and solutions of Navier-Stokes equation and energy equation are obtained by finite analytic method in the transformed computational domain. The flow separates in downstream of the blockage and the length of separated-flow region increases with Reynolds number. The heat flux is high on the top of the blockages and increase in the heat transfer occurs where the fluid reattaches the wall. Comparison between computed streamlines and experimental flow-visualization is also presented and discussed.
김창욱(C. U. Kim),전민승(M. S. Jun),박진철(J. C. Park),차성호(S. H. Cha),송정일(J. I. Jung) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
In this study, we evaluated using the finite element analysis of the structural safety of the bolt portion and simultaneous calibration Collet Tool structure of Pipe Fittings tool. Collet Tool was subjected to structural analysis can be applied to the piston action portions of the inner and outer piston maximum acting force (187.5Ton). Collet Tool bolt portion was subjected to structural analysis by applying a force(750Ton). Result of structural analysis, it will be considered to be structurally safe.
이상형,박진철,이언구,Lee, S.H.,Park, J.C.,Rhee, E.K. 대한설비공학회 1996 설비공학 논문집 Vol.8 No.3
This study aims to present the fundamental strategies to improve the Indoor Air Quality (IAQ) in apartment buildings. To investigate the concentration of indoor air pollutants such as radon, formaldehyde, and VOCs, both the document survey and the field measurement were conducted. In addition, to identify the source of the air pollutants, the laboratory experiment was carried out for various building materials. Finally, the minimum period to be reserved befor3e building occupation to ensure healthy IAQ, which largely depends on the ventilation rates, was simulated using a simple compuer program. The results of this study can be summarized as follows: 1. In case of newly-constructed apartment houses, concentrations of formaldehyde, VOCs and radon were found to exceed the standard. Meanwhile, at existing apartment houses, concentrations of VOCs, particularly toluene and xylene, highly exceeded the standasrd level. Concentrations of formaldehyde and radon, however, had been lowered according to the duration of occupation. 2. The laboratory experiment of concentration of pollutants per square meter of building material surface area showed that radon gas was much emitted from the gypsumboard; formaldehyde from flooring and wallpaper; and VOCs from paints and kitchen furnishings. The emission rates of formaldehyde and VOCs were proportional to air temperature. 3. According to the simulation of the minimum period to be reserved before occupation, newly-constructed airtight houses required about 190-200 days, and naturally ventialted houses with fully-open-windows required about 20-45days, in order to keep the level of radon gas lower than standard. Therefore, with the current practice, the date of occupation should be delayed for about 15 days.