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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.
복잡지형에서의 Wind Shear Exponent 예측
김현기(Kim Hyeon-Gi),김병민(Kim Byeong-Min),김진한(Kim Jin-han),백인수(Paek In-Su),유능수(Yoo Neung-Soo) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.2
In this study, we found a relationship between wind shear exponent, α, and a few factors such as the wind speed, V, ruggedness index(RIX), and the Weibull shape parameter, k of sites in complex terrain in Korea. Wind shear exponents in main wind directions were calculated using wind speed data measured for one year from various heights of eleven meteorological masts in Gangwon province. It was found from the analysis that the reciprocal of the wind shear exponent can be expressed by an exponentially decaying function with respect to a multiple of V, RIX and k. This result is considered useful to be used to characterize wind characteristics of specific sites in complex terrain in Korea with limited information.
김현기(Kim Hyeon-Gi),김병민(Kim Byeong-Min),백인수(Paek In-Su),유능수(Yoo Neung-Soo),김현구(Kim Hyun-Goo) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.5
In this study we performed a sensitivity analysis to see how the true north error of a wind direction vane installed to a meteorological mast affects predictions of the annual-average wind speed and the annual energy production. For this study two meteorological masts were installed with a distance of about 4 km on the ridge in complex terrain and the wind speed and direction were measured for one year. Cross predictions of the wind speed and the AEP of a virtual wind turbine for two sites in complex terrain were performed by changing the wind direction from -45° to 45° with an interval of 5°.A commercial wind resource prediction program WindPRO was used for the study. It was found that the prediction errors in the AEP caused by the wind direction errors occurred up to more than 20% depending on the orography and the main wind direction at that site.
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.
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.
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.
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.
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.