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회체가스중합법에 의한 수증기의 파장별 복사물성치 모델에 관한 연구
김욱중,송태호,Kim, Uk-Jung,Song, Tae-Ho 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.10
각종 노(furnace)를 포함하여 보일러, 가스터빈, 우주선 추진기구, 원자로 및 연료전지 등 고온이 열전달 문제를 다루는데 있어서 복사 열전달 연구는 매우 중요하다. 이러한 복사열전달에 대한 연구동향은 최근 복사 물성치(특히 가스에서의)를 예측하기 위한 이론 모델의 개발 및 측정분야와 복사전달 방정식의 해를 비교적 간단하게 구하기 위한 근사해법에 대한 연구로 크게 대별되고 있다. 이러한 두가지 연구방햐은 완전히 분리, 독립되어 있는 것은 아니며 서로 많은 연관성을 가지고 있다. 특히, 비회체가스(nongray gas)의 복사 성질에 대한 모델링은 근사 해법의 계산결과에 큰 영향을 미치게 되므로 가스의 복사 성질의 예측은 매우 중요한 연구 과제가 된고 있다. a Low resolution spectral modeling of water vapor is carried out by applying the weighted-sum-of-gray-gases model (WSGGM) to a narrow band. For a given narrow band, focus is placed on proper modeling of gray gas absorption coefficients vs. temeprature relation used for any solution methods for the Radiative Transfer Equation(RTE). Comparison between the modeled emissivity and the "true" emissivity obtained from a high temperatue statistical narrow band parameters is made ofr the total spectrum as well as for a few typical narrow bands. Application of the model to nonuniform gas layers is also made. Low resolution spectral intensities at the boundary are obtained for uniform, parabolic and boundary layer type temeprature profiles using the obtained for uniform, parabolic and boundary layer type temperature profiles using the obtained WSGGM's with 9 gray gases. The results are compared with the narrow band spectral intensities as obtained by a narrow band model-based code with the Curtis-Godson approximation. Good agreement is found between them. Local heat source strength and total wall heat flux are also compared for the cases of Kim et al, which again gives promising agreement. Low resolution spectral modeling of water vapor is carried out by applying the weighted-sum-of-gray-gases model (WSGGM) to a narrow band. For a given narrow band, focus is placed on proper modeling of gray gas absorption coefficients vs. temeprature relation used for any solution methods for the Radiative Transfer Equation(RTE). Comparison between the modeled emissivity and the "true" emissivity obtained from a high temperatue statistical narrow band parameters is made ofr the total spectrum as well as for a few typical narrow bands. Application of the model to nonuniform gas layers is also made. Low resolution spectral intensities at the boundary are obtained for uniform, parabolic and boundary layer type temeprature profiles using the obtained for uniform, parabolic and boundary layer type temperature profiles using the obtained WSGGM's with 9 gray gases. The results are compared with the narrow band spectral intensities as obtained by a narrow band model-based code with the Curtis-Godson approximation. Good agreement is found between them. Local heat source strength and total wall heat flux are also compared for the cases of Kim et al, which again gives promising agreement.
김욱중,김선태,김성수,권순길,안준모,김근홍,천창환,Kim, Uk-Jung,Kim, Seon-Tae,Kim, Seong-Su,Gwon, Sun-Gil,An, Jun-Mo,Kim, Geun-Hong,Cheon, Chang-Hwan 한국재료학회 2001 한국재료학회지 Vol.11 No.11
Conductive microspheres with a density of 0.2 g/cc were fabricated by electroless silver plating for application to the light-weighted microwave absorbers. The silver plating was conducted with the variation of plating conditions (sensitizing condition, $AgNO_3$, concentration, amount of reducing agent). Specimens have very low electro-resistivity. Under an optimum processing condition, conductive microspheres with uniform silver plating layer can be produced. Rubber-sphere composites were fabricated and their microwave absorbing properties were measured by HP8722D Network Analyzer. It was found that the lower the electrical resistance of microsphere, the better the microwave absorbing properties. Feasibility of microwave absorbers using this microspheres can be demonstrated with the result of microwave reflection loss of -15 dB and thickness of 1.44 mm.
김종률(Jong-Ryul Kim),김용민(Yong-Min Kim),김석영(Suk-Young Kim),이공훈(Kong-Hoon Lee),김욱중(Ook-Joong Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
It is granted that industrial division known as one of the biggest energy consumers has been estimated to consume over 55% of total energy consumption in Korea. There have been many studies to reduce its energy consumption by improving efficiency or suggesting new conceptions. Of the them, some studies concerned on industrial heat pump applications have shown highly effective performance and have been expected to result in magnificent energy saving effect because over 90% of dryer for industrial usage are hot wind type dryer running with 30~50% efficiency by evacuating exhaust air. Comparing with conventional dryers with 30%~50% energy efficiency, newly developing high temperature heat pump dryer is expected to enhance energy efficiency up to 60%~80% efficiency. In this paper, heat pump system for high temperature was designed, constructed and tested. The result has shown that system COPh is estimated over 2.8 producing hot water up to 90℃ and expected to over 90℃ or higher even when modified to air-to-air type.