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다중노출 입자영상해석을 통한 자연대류 유속측정에 관한 연구
한화택,김용식,Han, H.T.,Kim, Y.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
Using the film-based particle image velocimetry, natural convective flows have been measured quantitatively in a rectangular enclosure with a heater located on the bottom surface. The success rate of the present interrogation method has been obtained as a function of the number of particle pairs and the distance between the particle pairs. The influence of the diffraction halo at the center have been effectively eliminated by rotating-subtracting the original Fourier-transformed image. By utilizing the coded multiple pulsed illumination with two different time intervals, the minimum measurable velocity have been improved. The results of the velocity distributions and the heat transfer correlations have been obtained for different locations of heater in the enclosure.
한화택,Han, H.T. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.4
A numerical procedure is introduced to calculate local ventilation effectiveness using the definitions of local decay rate and local mean age. A low Reynolds number $k-{\varepsilon}$ model is implemented to calculate steady state turbulent velocity distributions, and a step-down method is used to calculate transient concentration distributions. Simulations are carried out for several different values of air change rates and several different diffuser angles in a two-dimensional model of a half scale office room. The results show that the local ventilation effectiveness within a room could vary significantly from one location to another. The nominal air change rate based on the assumption of complete mixing of room air does not provide the local ventilation effectiveness information. It is numerically proved that the local mean age distribution obtained from the transient calculation is equivalent to the steady state concentration distribution with homogeneously distributed contaminant sources.
사각공간내에서의 부분바닥가열에 의한 자연대류에 관한 연구
한화택,Han, H.T. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.2
In this study, the geometry consists of a two-dimensional rectangular enclosure with localized heating from below. The size and the location of the heater on the floor has been varied, and one of the vertical walls remains at a low temperature simulating a cold window. The governing equations for momentum, energy and continuity, which are coupled with turbulent equations have been solved using a finite volume method. A low Reynolds number $k-{\varepsilon}$ model has been incorporated to solve the turbulent kinetic energy and the dissipation rate. The heat transfer characteristics and the thermal environmental characteristics of the room have been obtained for various system parameters in a room with a partially heated floor.
이권재(K. J. Lee),김정석(J. S. Kim),백대성(D. S. Back),이상재(S. J. Lee),한화택(H. T. Han),이인복(I. B. Lee),한건수(G. S. Han) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
An experimental study has been performed to investigate the heating performance of the heat pump with the ventilation system under a heating condition. The heating performance of the heat pump were measured by the psychrometric calorimeter and were experimented at the heating standard condition of KS C 9306. Also, the heating performance was studied under the temperature conditions of the ventilation system along the temperature efficiency by using EES program. The heat pump with the ventilation system was higher about 1.5%~3% for the heating capacity and about 4%~9% for COP than that without the ventilation system. The effect of the effective enthalpy efficiency of the ventilation system was not significant for the heat pump performance.