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빙축열 시스템의 제빙용 열교환기내에서 유동 및 열전달 특성
백영렬,이재헌,Back, Young-Ryoul,Lee, Jae-Heon 대한설비공학회 1994 설비공학 논문집 Vol.6 No.2
Three dimensional characteristics of fluid flow and heat transfer have been studied numerically around the latent heat storage vessel which was applied to the practical ice-storage system. The result obtained indicates that the value of frictional coefficient decreases with decrease of baffle width. For the baffle spacing. $S/H_D=9.375$, baffle height. $H/H_D=0.5$ and various pressure drop, average Nusselt numbers in heat transfer surface are much dependent on the width of side baffle and middle baffle. that is. Nu_m decreases with decrease of the width of middle baffle when the width of side baffle is 4.375, where as the optimum condition of side baffle for $Nu_m$ exists in the range of 3.5< $B_1/H_D$ <4.375 at the width of middle baffle, $B_2/H_D=6.875$.
Pressure Drop in a Separator Type Filter
Jae-Heon Lee,Sang-Jun Cho,Young-Ryoul Back,Myoung-Sig Park 대한설비공학회 1993 International Journal Of Air-Conditioning and Refr Vol.1 No.-
Theoretical and experimental investigations to find the characteristics of pressure drop have been made for various filter elements with different separator heights, filter depths, and average inlet velocities. A filter element with square cross-section was selected as a test model to predict the pressure drop in a separator type filter with a 90˚ pleated angle. The filter element consists of two flow channels enveloped with upstream filter medium, flat filter medium, downstream filter medium, and separator. On the theoretical study, the total pressure drop was calculated by combining the pressure drop generated by the filter medium and the pressure drop generated by friction through the flow channels. On the experimental study, the local pressure drop was measured from the test model.<br/> The results indicate that for a given filter element there is an optimum separator height with a minimum total pressure drop. At higher separator height, the total pressure drop is mainly influenced by the pressure drop due to the filter medium. But, as the filter height decreases, the friction of the flow channels takes more effect to the total pressure drop.