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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.
채관교(Chai Kwan-Kyo),이현진(Lee Hyun-Jin),김종규(Kim Jong-Kyu),윤환기(Yoon Hwan-Ki),이상남(Lee Sang-Nam),강용혁(Kang Yong-Heack),서태범(Seo Tae-Beom) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Daegu Solar Power Tower Plant of 200 kW thermal capacity was developed for the first time in Korea, 2011. Measurement of the heat flux distribution is essential to evaluate the solar energy concentrated by reflectors and to design a suitable receiver. The flux mapping technique, which uses a radiometer and a diffuse plate, is common for measurement of the heat flux distribution. Because the solar power tower plant has a wide concentration area, the flux mapping technique using a fixed diffuse plate is difficult to apply. Therefore, the flux distribution in the solar power tower plant should be measured by the flux mapping technique using a small moving bar. In this study, we measured flux distributions with the moving-bar system developed at the KIER solar furnace and evaluated its applicability for the solar power tower plant.
채관교(Chai, Kwan-Kyo),이현진(Lee, Hyun-Jin),김종규(Kim, Jong-Kyu),윤환기(Yoon, Hwan-Ki),이상남(Lee, Sang-Nam),강용혁(Kang, Yong-Heack),서태범(Seo, Tae-Beom) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
Concentration characteristics of the KIER solar furnace are analyzed with a heat flux measurement technique. Total heat capacity of 40kW was confirmed within 1.04% average error, and the normalized maximum heat flux of 3,452 kW/m2 was proved. Non-Gaussian flux distribution in the vertical direction implies that reflectors should not be random ratherinc lined downwards. Moreover, we characterized flux distribution variations with furnace blind opening ratio, distance from the focal plane, and misalignment of the measurement system. Based on the results, the heat flux distribution can be simply estimated once reflectivity and direct normal insolation values are known. This study will be helpful to the design and the performance evaluation of receivers or chemical reactors.
개방형 체적식 흡수기를 위한 SiC 허니컴 모듈의 성능 평가
채관교(Chai Kwan-Kyo),이현진(Lee Hyun-Jin),윤환기(Yoon Hwan-Ki),이상남(Lee Sang-Nam),한인섭(Han In-Sub),서두원(Seo Doo-Won) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Daegu Solar Power Tower Plant of a 200 kW thermal capacity uses an open air receiver. An air receiver is generally based on the volumetric receiver concept with porous ceramic absorbers. Because absorber material is important in the volumetric receiver, ceramic materials with excellent thermal conductivity, high solar absorptivity and good thermal stability have been researched. KEER also developed SiC honeycomb absorber modules and evaluated performance of the modules at the KIER solar furnace. For performance evaluation, we made an open volumetric receiver containing the modules and measured the outlet temperature and the efficiency. It is demonstrated that performance of the KEER absorber is comparable to that of a reference absorber developed by DLR.
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.
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.
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.
채관교(Kwan-Kyo Chai),이현진(Hyun-Jin Lee),김종규(Jong-Kyu Kim),이상남(Sang Nam Lee),강용혁(Yong-Heack Kang),서태범(Tae-Beom Seo) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Concentration characteristics of the KIER solar furnace are analyzed with the flux mapping that is a heat flux measurement technique. Total heat capacity of 40kW was confirmed within 3.1% error, and the normalized maximum heat flux of 3491 ㎾/㎡ was proved. Non-Gaussian flux distribution in the vertical direction implies that reflectors should not be random rather inclined downwards. Based on the results, the heat flux distribution can be simply estimated once reflectivity and direct normal insolation values are known. This study will be helpful to the design and the performance evaluation of receivers or chemical reactors.
발포 금속을 이용한 압축 공기용 태양열 흡수기의 설계 및 성능평가
이현진(Lee, Hyun-jin),채관교(Chai, Kwan-kyo),유창균(Yu, Chang-kyun),김종규(Kim, Jong-kyu),강용혁(Kang, Yong-heack) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.4
Recently we reported development of tubular solar receivers to produce the high-temperature and high-pressure air, which is critical to realizing the combined cycle with the concentrated solar radiation. In this study, we present a receiver design to improve efficiency by introducing metal foam as porous media to increase heat transfer area inside a tubular receiver. We conducted performance evaluation test in the KIER solar furnace with 5 bar air and provide preliminary experimental results in terms of outlet temperature and efficiency. Comparisons with the receiver in the previous study that does not use metal foam reveal that the introduction of metal reduces receiver efficiency unlike expectation. The reason is that the different thermal expansion between stainless steel tube and metal foam increases the gap and thereby contact resistance. Because of poor heat transfer inside the tube, the solar receiver with metal foam inside could not resist high solar flux.