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백인수,Paek, In-Su 한국음향학회 2009 韓國音響學會誌 Vol.28 No.1
정재파 열음향 냉각기의 스텍에서의 온도 구배와 냉각기 효율의 관계에 대한 연구를 수행하였다. 스택에서의 로트식 (Rott Equation) 을 이용하여, 스택을 통과하는 엔탈피 플럭스의 크기가 크게 되면, 스택에서의 온도구배가 비선형의 특성을 나타내는 것을 밝혀내었다. 또한 이런 비선형의 스택 온도구배가 열음향 냉각기의 냉각 효율을 저하시키는 것을 확인하였다. 1/4 파장의 정재파 열음향 냉각기를 이용한 시뮬레이션을 통해, 특정길이의 스택에 대해 냉각 용량이 커질수록, 또한 특정냉각 용량에 대해, 스택의 길이가 길어질수록 비선형의 스택 온도구배가 크게 일어남을 알아낼 수 있었다. Investigations of the relation between the stack temperature profile of a standing wave thermoacoustic cooler and the cooling efficiency were performed. Based on the mathematical derivations using the Rott Equation, it was found that the temperature profile along the stack becomes nonlinear as the enthalpy flux passing through the stack increases. It was also found that such nonlinear temperature profiles lower the cooling efficiency. Simulations using a thermoacoustic simulation program called DELTAE showed that the nonlinear temperature profile occurs with a long stack and large cooling load.
윤성민,백인수,한영태,남효갑,Youn, Sung-Min,Paek, In-Su,Han, Young-Tae,Nam, Hyo-Gab 한국교육시설학회 2011 敎育施設 Vol.18 No.3
Performance of a small-capacity solar absorption cooling system was investigated experimentally. Ten sets of evacuative-tube solar-heat collectors and a 5 kW single-stage absorption cooler were combined to produce a hybrid cooling system. The performance of the cooling system was measured using a tim-coil unit installed in a small plastic storage. It was found from the test on a sunny day of May that when the temperature of the hot water supplied from the solar collectors to the generator of the absorption cooler reached $60^{\circ}C$, the absorption cooler started cooling and the cold water temperature measured from the fan-coil unit reached $18^{\circ}C$. The COP, which is defined as the ratio of the cooling power to the total electrical power input was higher than 1.0.
소형 풍력발전기 날개 모니터링을 위한 FBG 변형률 센서의 적용
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Arrays of Fiber Bragg Grating (FBG) sensors and strain gauges were used to extract deflection mode shapes of a small wind turbine blade made from fiber reinforced plastic (FRP). A cantilever system developed for this study was employed to fix the blade at the root. Impact Responses of the blade using the sensors attached from the top and bottom surfaces of the blade were measured. The fundamental frequencies and higher modes of the blade cantilever system obtained from both sensors were almost identical. Deflection mode shapes were estimated from the strain modes. The mode shapes were close but slightly different from each other. The differences are considered due to the fact that the top and bottom sections where the sensors were attached are Non-symmetric.
상용 CFD 프로그램을 이용한 풍력터빈 축소모델 출력계수 검증 및 후류 해석
김병수(Kim Byoungsu),백인수(Paek Insu),유능수(Yoo Neungsoo) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
A numerical simulation on the wake flow of a wind turbine which is a scaled version of a multi-megawatt wind turbine has been performed. Two different inlet conditions of averaged wind speed including one below and one above the rated wind speed were used in the simulation. Steady-state pitch angles of the blade associated with the two averaged wind speeds were imposed for the simulation. The steady state analysis based on the Reynolds averaged Navier-Stokes equations with the method of frame motion were used for the simulation to find the torque of the rotor and the wake field behind the wind turbine. The simulation results were compared with the results obtained from the wind tunnel testing. From comparisons, it was found that the simulation results on the turbine power are pretty close to the experimental values. Also, the wake results were relatively close to the experimental results but there existed some discrepancy in the shape of velocity deficit. The reason for the discrepancy is considered due to the steady state solution with the frame motion method used in the simulation. However, the method is considered useful for solutions with much reduced calculation time and reasonably good accuracy compared to the transient analysis.