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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.
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.