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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.
오용운(Yong Oon Oh),백인수(In Su Paek),남윤수(Yoon Su Nam),라요한(Yo Han La) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.1
A study on the available power of a wind turbine to be used for wind farm control was performed in this study, To accurately estimate the available power it is important to obtain a suitable wind which represents the three dimensional wind that the wind turbine rotor faces and also used to calculate the power. For this, two different models, the equivalent wind and the wind speed estimator were constructed and used for dynamic simulation using matlab simulink. From the comparison of the simulation result with that from a commercial code based on multi-body dynamics, it was found that using the hub height wind to estimate available power from a turbine results in high frequency components in the power prediction which is, in reality, filtered out by the rotor inertia. It was also found that the wind speed estimator yielded less error than the equivalent wind when compared with the result from the commercial code.
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo),남윤수(Yoon Su Nam) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
A load-monitoring system that resembles a small wind turbine is designed to measure the dynamic load of a small wind turbine blade The optical fiber sensors (FBGs) are used in the system to measure the dynamic strain of the blades. The system is designed to perform measurements while the blades are rotating at a specified rotating speed by a motor installed in the Nacelle. It can also be used to test individual pitch control (IPC) algorithms and monitor the conditions of various parts including the main shaft, bearing, tower, and the nacelle in a wind tunnel in the future.
윤광용(Yoon, Kwang-Yong),백인수(Paek, In-Su),유능수(Yoo, Neung-Soo) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
A linear wind prediction program, WAsP, was employed to predict wind speed at two different sites located in complex terrain in South Korea. The reference data obtained at locations more than 7 kilometers away from the prediction sites were used for prediction. The predictions from the linear model were compared with the measured data at the two prediction sites. Two compensation methods such as a self-prediction error method and a delta ruggedness index (RIX) method were used to improve the wind speed prediction from WAsP and showed a good possibility. The wind speed prediction errors reached within 3.5 % with the self prediction error method, and within 10% with the delta RIX method. The self prediction error method can be used as a compensation method to reduce the wind speed prediction error in WAsP.
윤진용(Yoon, Jin-yong),백인수(Paek, In-su),유능수(Yoo, Neung-so) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.1
An aerodynamic design tool was developed for small wind turbine blades based on the blade element momentum theory. The lift and drag coefficients of blades that are needed for aerodynamic blade design were obtained in realtime from the Xfoil program developed at University of Illinois. While running, the developed tool automatically accesses the Xfoil program, runs it with proper aerodynamic and airfoil proper ties, and finally obtains lift and drag coefficients. The obtained aerodynamic coefficients are then used to find out optimal twist angles and chord lengths of the airfoils. The developed tool was used to design a wind turbine blade using low Reynolds number airfoils, SG6040 and SG6043 to have its maximum power coefficient at a specified tip speed ratio. The performance of the blade was verified by a commercial code well known for its prediction accuracies.
윤성민(Youn, Sung-Min),백인수(Paek, In-Su),한영태(Han, Young-Tae),남효갑(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 , the absorption cooler started cooling and the cold water temperature measured from the fan-coil unit reached . The COP, which is defined as the ratio of the cooling power to the total electrical power input was higher than 1.0.
광섬유 브레그격자 센서를 이용한 풍력발전기 날개의 모드 해석
김창환(Chang Hwan Kim),백인수(Insu Paek),유능수(Neung Soo Yoo),남윤수(Yoon Su Nam) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
소형 풍력발전기 날개의 동적 거동에 대한 실험적 연구를 수행하였다. 날개를 따라 배열된 광 브레그 격자 (Fiber Bragg Grating) 센서를 이용하여 날개 표면에서의 변형률(strain)을 측정하였다. 충격 햄머 실험 (Impact Hammer Test)을 통하여, 1차 및 고차 모드의 공진주파수를 측정하였다. 광섬유 센서를 이용한 실험결과를 스트레인 게이지를 이용한 실험 결과와 비교한 결과 모드 주파수는 매우 유사하였다. 하지만, 광섬유 센서의 경우 스트레인 게이지에서 감지하지 못하는 모드를 감지할 수 있었다. 또한, 실험으로부터 얻은 변형률 모드를 이용하여 근사적으로 날개의 변위 모드를 추정하였다. The dynamic behavior of a small wind-turbine blade was analyzed experimentally. Arrays of fiber Bragg-Grating (FBG) sensors attached along the blade were used to measure the strains of the blade surface. An impact test was performed to estimate the resonance frequencies of the fundamental and higher modes of the cantilever blade system developed for this study. The results were similar to the results for conventional strain gages. However, FBG sensors could sense modes that strain gauges could not sense. The strains obtained from the FBG sensor array were used to estimate displacement-mode shapes of the blade.