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김덕진(Deok Jin Kim),유해성(Hea Seong Ryu),신상윤(Sang Yoon Shin) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
A pressure-type rapid automatic filter of 2000㎜ diameter and 170 ton/h filtering capacity was fabricated. In case of no external impurity inflow, the turbidity removal efficiency on raw water was experimented and the numbers of impurities of each sizes were analyzed by particle counter. As the result of circulated filtering, the raw water of 40 NTU was filtered to 0.44 NTU and the numbers of impurities above 1㎛ were removed by approximately 95%. With the filtering efficiency experimented and the mathematical method, the turbidity change of circulation water were calculated according to the inflow rate of external impurity and water treatment method of blow-down or filtering. The cost of blow-down water was calculated from above results. And simple payback period for this filter is calculated as about one year. Nowadays, as the cost of water is continuously increasing and environment regulations will be more strict, the water quality control using this filter will be expected to satisfy the user requirement.
딤플형 판형 열교환기의 유동 및 전열특성에 대한 수치해석
안혁진(Hyuk Jin Ahn),이상혁(Sang Hyuk Lee),허남건(Nahmkeon Hur),박형준(Hyoung Joon Park),유해성(Hea Seong Ryu) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.3
In the present study, the characteristics on the internal flow and heat transfer of the dimple-type plate heat exchanger were numerically investigated. For the numerical analysis, the conjugate heat transfer analysis between hot fluid-separating plate-cold fluid was performed using the periodic boundary condition at the center area of the plate and appropriate inlet and outlet conditions for the two streams. The numerical results were validated by the comparison with the experimental data. From these results, the correlations of the Colburn j-factor for the heat transfer and the Fanning f-factor for the flow friction were obtained. The present results could be applicable for the optimal design of dimple-type plate heat exchanger.