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이재호(Jaiho Lee),김광홍(Kwanghong Kim) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.2
미국 표준설계인증을 위해 개발된 APR1400 NRC DC 원전의 최종열침원과 순환수계통은 미국 포괄부지변수를 적용하여 기계통풍식 냉각탑으로 개념 설계되었다. 본 연구에서는 APR1400 NRC DC 최종열침원 냉각탑 수조 크기를 결정하기 위해서 US-APWR 및 US-EPR 원전의 냉각탑 설계특성을 정성적으로 비교 분석하였다. APR1400 NRC DC 냉각탑은 미국 규제지침서 1.27에 따라 소외전원상실 및 원전부지의 최악의 기상조건하에서 외부로부터 보충수 공급 없이 30일 동안 안전정지 및 냉각재상실사고에 대해 충분한 냉각수를 공급할 수 있도록 설계되었다. 냉각탑 수조의 용량은 30일 동안의 냉각수 증발과 비산율을 기반으로 필요한 냉각수량을 계산하여 결정되었다. APR1400 NRC DC 원전의 순환수계통은 각각 28개의 셀을 가진 두 개의 냉각탑으로 설계되었다. The ultimate heat sink (UHS) and circulating water system (CWS) of the APR1400 NRC DC plant developed for US NRC (Nuclear Regulatory Commission) standard design certification were conceptually designed as a mechanical draft cooling towers by applying input parameters enveloping all sites of United States. In this study, the cooling tower design characteristics of the US-APWR and US-EPR plants were qualitatively compared and analyzed to determine the size of UHS cooling towers of the APR1400 NRC DC. The capacity of the basins for the UHS cooling towers was determined by calculating the required cooling water capacity (CWC) based on the cooling water evaporation and the drift loss rate for 30 days. The CWS of the APR1400 NRC DC plant was designed with two cooling towers each with 28 cells
노형운(Hyung-Woon Roh),서상호(Sang-Ho Suh),김진형(Jin Hyung Kim),김태권(Teckwon Kim),오석영(SuegYoung Oh),하필수(PilSu Ha),정종현(Jong-hyun Jung),김광홍(KwangHong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In order to improve the efficiency, the CFD-based design system is applied to the Francis turbine replacement project with Korea Fluid Machinery Association (below KFMA) and K-water. The inversed design technique and the fully turbulent 3-dimensional flow simulations are performed in the previous study. In this study, the runner is newly manufactured from the reversed engineering and CFD's results. By Manufacturing method, the precision wood pattern, casting, a number of the surface blasting as like the buffering and a balancing technique is selected Furthermore, The turbine with newly runner is respectively experimented with the output in accordance with IEC60041 code. The performances of the new design are verified by the approved test and the guarantees have all been successfully met. From the experiment results, the efficiency of the newly turbine, 87.5% is more enhanced than the efficiency of the old model for the 500kW. The perfect combination of the CFD analysis has finally resulted in a new model which can provide about a 10% increase in peak efficiency.