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연구용 원자로의 다양한 운전범위에 따른 일차계통펌프 설계
서경우(Kyoungwoo Seo),윤현기(Hyungi Yoon),지대영(Dae-young Chi),윤주현(Juhyeon Yoon) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A design of a primary cooling system, which removes the heat generated from the core, is dependent on a purpose of a research reactor. A reactor can require variable operating ranges for the primary cooling system. To operate the variable operating range, the primary cooling pump is designed with an inverter or a control valve in the system. The system pressure losses are calculated by the analytic and the numerical methods for the required flow rates estimated from the required core powers and temperature differences. It can be designed that the pump curve is moved by the rpm control with an inverter for the variable pump operating range. If a control valve is installed in the system, a pump curve can be used for the variable range.
정민규(Minkyu Jung),서경우(Kyoungwoo Seo),김성훈(Seonghoon Kim) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.5
In this study we apply and compare a variety of numerical methods for calculating residence time distribution in decay tanks, a major design component in the for reducing N-16 radioactivity. Our research group has used a streamlined method using user-defined particle numbers. However, this streamlined method has several problems, including low exiting particle ratios, particle diminishing, and unphysical time distribution, among others. We utilize three numerical methods to establish residence time and time distribution (streamlined, discrete phase method [DPM], and user defined scalar [UDS]) and subsequently compare the averaged results of each. The three tests demonstrate the flow features within the decay tanks, which are then numerically simulated to enable comparison. We conclude that although each simulation predicts similar time averages, the UDS methodology provides a smoother time distribution and tracer contour plots at specific times.