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윤환기(Yoon Hwan-Ki),오병주(Oh Byung-Joo) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.1
본 논문은 기존의 추적방식인 아날로그 방식의 하드웨어적 제어에서 탈피하여 디지탈 방식의 소프트웨어적 제어방식인 적응제어 이론을 태양 추적장치에 적용하여 정확하고 간단하게 추적하는 제어장치를 설계 제작하고, 이에 대한 성능을 평가하였다.<br/> 추적회로에 적용할 제어이론은 최근 로보트 제어에 적용하여 각광을 받고있는 Adaptive independent control 이론을 도입하였다. 이 제어이론을 태양 주적장치에 적용했을 경우의 효과에 대해 모델링에 의한 컴퓨터 시뮬레이션을 행하였고, 그 결과, 제어이론을 적용한 경우가 좀더 정확한 추적을 행하며, 추적오차를 약 1/2 정도 줄일 수 있음을 알았다. 추적 제어장치의 제작은 DALLAS 사의 DS5000T를 마이크로 프로세터로 사용하여 회로를 간소화 시켰으며, 제작된 추적장치를 실제로 동작시켜 추적이 제대로 행해지는지를 엔코더와 Data Acquisition System을 설치하여 측정하였다. 측정 결과는 시뮬레이션의 경우와 근접했으며, 적응제어 이론을 적용한 추적 제어장치가 태양을 더 정확하게 추적함을 알 수 있었다. This study aims at developing the control device of solar tracking system which can accurately track the sun with a simple operation. Actual control device is designed and manufactured to evaluate its performance. The digital control method base on recently developed adaptive control theory is adopted for main control algorithm instead of a traditional analog control method.<br/> Adaptive independent control theory is introduced for the control algorithm of tracking circuit, which is prevailing in the field of robot control nowadays. Computer simulation of solar tracking model reveals the new device operated by control theory could reduce the error to one half with the comparison of a existing device. Tracking circuit can be simplified by adopting the DS5000T ?-processor made by the DALLAS company. Actual measurement is conducted to verify the correct operation of manufactured control device with a encorder and a data acquisition system. The experimental results coincided with the simulation results, and our new tracking control device operated by adaptive control theory can track the sun more accuratly.
채관교,이현진,윤환기,김종규,강용혁,이성욱,Chai, Kwan-Kyo,Lee, Hyun-Jin,Yoon, Hwan-Ki,Kim, Jong-Kyu,Kang, Yong-Heack,Lee, Sung-Wook 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.3
A solar thermal simulator is suitable for indoor experiments of solar receivers and reactors when solar insolation and weather conditions are not favorable. Moreover, due to the easy control of electric power input, the solar thermal simulator allows the adjustment of power input incident on solar receivers and reactors and thus the implementation of accurate experiments. We manufactured a solar simulator, which is comprised of three sets of a xenon lamp and an elliptical reflector. In order to serve as a test facility, optical characterization of the solar simulator via radiation heat flux measurement is a critical prerequisite. We applied the flux mapping method to measuring the heat flux distribution of the three lamps. We presented the measurement results in terms of the heat flux distribution, the peak heat flux, the power distribution, the maximum power, and the efficiency for electric power conversion into radiation power. Characterization results show that our solar simulator provides the peak heat flux of $3,019kW/m^2$, the maximum power of 16.9 kW, and the conversion efficiency of 45%, additionally with a 10% operation margin for output increase.
TRANSYS를 이용한 태양열 온수급탕 시스템의 년성능 평가연구
강용혁(Yong-Heack Kaug),윤환기(Hwan-Ki Yoon),곽희열(Hee-yul kwak),윤종호(Jong-Ho Yoon) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.3
본 연구에서는 태양열온수급탕시스템의 장기성능평가를 위한 실험과 TRANSYS를 이용한 시뮬레이션을 수행하였다. PSTAR 방법을 이용한 성능평가는 기존 열성능평가보다 년성능평가를 가능하게 함을 입증하였다. 입증모델의 다양한 에너지 개념의장기성능평가와 에너지량을 계산하였고, 모델시스템의 Audit Model을 작성하여 재표준화 계수를 산정하였다. There is an absolute need to establish standards for testing and performance rating to develop a high-efficiency solar domestic hot water systems for practical utilization and promotion of solar energy, since most of solar domestic hot water systems marketed presently are imported from foreign countries.<br/> The new standard for testing and performance rating should allow accurate, sound intercomparision of alternative systems.<br/> It also should be a means of opimizing a new or developing system design. The objective of this paper is to analyze thermal performance data and simulation modeling for the rating of SDHWS using TRANSYS.<br/> A new method is introduced, based on PSTAR Method, with reconcilation data and model.<br/> Renomalized terms are calculated to validate the model.
집광 열유속 측정과 모델링의 비교를 통한 집광오차 평가
채관교(Chai, Kwan-kyo),윤환기(Yoon, Hwan-Ki),이현진(Lee, Hyun-Jin),이성욱(Lee, Seong-Uk),김시석(Kim, Si-Seok) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.4
It is important to evaluate concentration errors due to its critical role to the concentrated solar power technology. Nonetheless, the evaluation of concentration errors is challenging because error sources are various and they are not easy to measure and count all together. In this paper, we explain that concentration errors can be represented in terms of a root mean square value of reflection surface slope errors. Then we present an indirect approach to assessing the reflection surface slope errors by comparing solar flux measurement data with modeling calculation. We applied the approach for solar furnaces and investigated its feasibility.
집광 열유속 측정과 모델링의 비교를 통한 집광 오차 평가
채관교(Chai Kwan-kyo),윤환기(Yoon Hwan-Ki),이현진(Lee Hyun-Jin),이성욱(Lee Seong-Uk),김시석(Kim Si-Seok) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.3
Concentration errors critically affect the performance of solar concentrator, so their evaluation is important to the concentrated solar power technology. However, the evaluation is very challenging because error sources are various and not easy to measure individually. Therefore, the integrated effect of concentration errors is often more interesting and useful for large-scale applications. In the present work, we analytically investigate and classify various concentration error sources and then explain that the effect of various concentration errors can be represented in terms of a root mean square value of reflector surface slope error. We present an indirect approach to assessing the reflector surface slope error by comparing solar flux measurement data with modeling calculations. We apply the approach for solar furnaces with different thermal capacity and investigate its advantages and disadvantages.
김종규,강용혁,김진수,윤환기,유창균,이상남,Kim, Jong-Kyu,Kang, Yong-Heack,Kim, Jin-Soo,Yoon, Hwan-Ki,Yu, Chang-Kyun,Lee, Sang-Nam 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.1
This paper describes the procedure and calculation results of basic design and transient variation of performance of 1 MWe large scale solar thermal power plant (STPP) by using the commercial software of THERMOFLEX and TRNSYS, respectively. In order to simulate the transient variation of STPP, the results of basic design are necessary. The design standard of the STPP is 1 MWe generation with solar only at high DNI condition and then 0.6 MWe output power for 1 hour using stored energy when the DNI becomes lower unable to operate normally. The results of basic design show the important design data of flow rates, water/steam conditions at each equipments and the estimated efficiency of STPP. In addition, dynamic simulation results of STPP are predicted and plotted for one year and three different days weather data of Daejeon.
강명철(Kang, Myeong-Cheol),강용혁(Kang, Yong-Heack),윤환기(Yoon, Hwan-Ki),유성연(Yoo, Seong-Yeon) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
To evaluate the performance of concentrating solar cookers, a parabolic solar cooker have been designed and constructed. Tests were carried out to define the performance characteristics of concentrating cookers under ambient conditions. The performance and test of the solar cooker were measured and conducted using the international standard procedure that was proposed at the Third World Conference on solar cooking. Stagnation temperature and water heating tests were carried out to determine the maximum temperature attained by the cooker and to evaluate the thermal performance of the cooker. The analysis showed that the solar cooker has maximum cooking power and efficiency 474W, 420W and 41%, 40%, respectively.
채관교(Chai Kwan-Kyo),이현진(Lee Hyun-Jin),윤환기(Yoon Hwan-Ki),김종규(Kim Jong-Kyu),강용혁(Kang Yong-Heack),이성욱(Lee Sung-Wook),김시석(Kim Si-Seok) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
The solar simulator system is designed for indoor tests of solar thermal receivers and reactors in the case of changeable weather conditions. Because the solar simulator allows the control of electric power input, it is easy to adjust solar thermal power input and thus to implement accurate tests of receivers. Recently, we have manufactured a solar simulator, which is comprised of three sets of a xenon lamp and an elliptical reflector. In order to serve as a test facility, optical characterization of the solar simulator via radiation heat flux measurement is a critical prerequisite. We used the flux mapping method that the measurement error proved to be less than 5% and individually measured the flux distribution of the three lamps. We presented the measurement results in terms of the heat flux distribution, the maximum heat flux, the power distribution, and the efficiency for electric power conversion into radiation power.
Dish-Stirling 태양열 발전시스템 운전 및 성능분석
김진수(Kim, Jin-Soo),강용혁(Kang, Yong-Heack),이상남(Lee, Sang-Nam),윤환기(Yoon, Hwan-Ki),유창균(Yu, Chang-Kyun),김종규(Kim, Jong-Kyu),조덕기(Jo, Dok-Ki) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
As a final step for developing a small-scale solar thermal power generation technology, a demonstration project for a dish-stirling power system has been carried out by KIER. During the two years project period, 10kW solar-only power system was built in Jinhae city and successful solar operations were demonstrated. In this paper an example of typical clean day operation and analysis results was introduced.