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식생형 LID 시설에서 면적 기반의 적정 용량 설계 방법 연구
박서원,길경익 한국습지학회 2018 한국습지학회지 Vol.20 No.4
Recently, it has been reported that water pollution due to non-point pollutants continues. Studies have been actively carried out to prevent such non-point pollutants from flowing into the water system and to prevent water pollution. In this study, to evaluate the adequate design of the LID facilities the rainfall corresponding to 80% of the cumulative rainfall of Yongin city was applied to an SA / CA graph obtained from the analysis of monitoring results of the vegetation type LID facility. As a result, the appropriate SA/CA ratio was 0.6% for stormwater sustain efficiency 80% and the appropriate SA/CA ratio was 0.5% for TSS removal efficiency 80%. The appropriate SA/CA ratio of the vegetation type LID proposed in this study can be used as a basis. for the future vegetation type LID design. If more data of vegetation type LID are added through continuous research, it will be more accurate. 최근 비점오염 물질로 인한 수계 오염이 보고되고 있으며, 이러한 비점오염 물질에 의한 수계 오염을 방지하기 위한연구가 활발히 수행되고 있다. 본 연구에서는 LID 시설의 적정 용량 설계 여부를 평가하기 위해 식생형 LID 시설의모니터링 결과를 분석에서 얻은 SA/CA 그래프에 용인시의 누적강우량 80%에 해당하는 강우를 적용시켜 보았다. 분석결과, 누적강우량 80%에 해당하는 강우의 유량저감 효율 80%를 달성하기 위한 SA/CA 비율은 0.6%, TSS 제거효율80%를 달성하기 위한 SA/CA 비율은 0.5%로 나타났다. 본 연구에서 제시한 식생형 LID 시설의 적정 SA/CA 비율은향후 식생형 LID 시설 설계의 기초자료로 활용될 수 있으며, 지속적인 연구를 통해 더 많은 식생형 LID 시설의 데이터를추가한다면 신뢰도를 높일 수 있을 것이다.
오일의 유량 변화와 오프셋 스트립 휜을 고려한 오일쿨러의 복합열전달 해석
박서원(S.W. Park),최형권(H.G. Choi) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.1
Conjugate heat transfer of an automotive oil cooler with offset-strip fins was numerically investigated to predict the performance of the oil cooler for various flow-rates. The simulations were conducted by directly modeling offset-strip fins with unstructured meshes. The incompressible Navier-Stokes equations coupled with energy equation were used for the present simulations. Heat transfer characteristics of the oil cooler was compared well with experimental results and the errors were approximately within 5 percents. It was found that the performance of the oil cooler increased as the flow-rate increased up to the flow-rate of 12 L/min, but the performance seemed to be saturated beyond a critical flow-rate, which was estimated as 15 L/min. Furthermore, it was confirmed that compared to the performance without fins, that of the oil cooler with offset-strip fins was increased by about 75 percents.