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尙凞善 慶一大學校 1999 論文集 Vol.16 No.6
본 논문은 태양광 조사에 의한 실리카겔의 흡수·산란특성을 규명하기 위해 백색 및 청색 실리카겔을 사용하여 함수율, 겔의 입경과 형상에 따른 특성을 분광학적으로 연구하였다. 또한 측정결과와 태양광을 직접 조사하여 실리카겔을 재생한 경우의 입자 충진층에 대해 4 flux 이론을 사용하여 수치계산을 수행하였다. 그 결과 실리카겔 입자 충진층은 산란 지배임을 알 수 있었으며, 태양광을 이용한 제습 냉방시스템에서 재생효율에 영향을 주는 태양광의 흡수율은 함수율이 높은 경우에 백색 및 청색실리카겔은 그다지 차가 없었으며, 파쇄형 보다는 구형, 입경이 작은 경우보다도 큰 경우가 재생효율이 높았음이 확인되었으며, 구하여진 물성은 실리카겔을 이용한 설계에 유용하게 사용될 수 있다. We use white and blue silica gel and study moisture content and properties of a particle dia and a shape of silica gel spectroscopically to show properties of absorption and scattering of silica gel by solar light research on this thesis. We also research these data, results and solar light, and do calculation about particle filling in case of silica gel regeneration by 4-flux theory. As a result, we can find particle filling layer of silica gel is scattering domination, and It isn't much difference between white and blue silica gel when absorptivity of solar light is higher than moisture content of it which have effect on regenerative efficiency in dehumidify heating system using solar light. Also we can find spherical type than crush type and big one than small one have much better regenerative efficiency, and the gain properties is used usefully in system design of silica gel.
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尙凞善 慶一大學校 1997 論文集 Vol.14 No.2
열풍·온풍을 이용한 건조 시스템은 열효율이 낮고, 건조속도가 느리며, 석유류의 사용으로 인한 대기오염 등의 문제가 있다. 본 연구에서는 원적외선 발생용 세라믹 코팅관을 개발하고, 가스 연소시스템에 적용하여, 대표적인 농산물, 수산물 및 세라믹 Coating 전자부품을 대상으로 세라믹이 코팅되지 않는 나관의 경우와 비교하여 전열실험을 수행하여 비교·검토하였다. 실험결과 열방사관의 복사능의 효율은 온도에 따라 다소 다르나, 표면온도가 90℃에서 복사능이 94%이상으로, 건조기의 열효율이 열풍·온풍을 이용한 건조 시스템에 비하여 20%이상 높았으며, 건조대상물의 두께가 두꺼울수록 높았다.
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尙凞善 경일대학교 2001 論文集 Vol.17 No.-
A spectral measurement system for reflection and transmission properties by using an optical fiber and an ellipsoidal mirror was newly developed. The hemispherical reflectance and transmittance spectra of several ceramics materials were measured from visible to middle infrared region. The directional characteristics of reflection and transmission were also investigated in consideration of the absorptance. The measured data were analyzed by using a four flux model of radiation transfer. The radiation properties could be estimated by the obtained scattering and absorption coefficient spectra.
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動力 Plant에 있어서 Energy 有效利用을 위한 蒸氣 Turbine-熱 Pump複合 Cycle에 對한 硏究
尙凞善 慶北工業專門大學 1979 論文集 Vol.16 No.-
We put an end to it as a result of so far discussed study, the following statement s become very manifest. 1. We acknowlege, the higher temperature of heat or condensate temperature of Heat pump generate at compound cycle, the lower the ??, the higher ?? and the lower the ?? 2. If the lower evaporate temperature of Heat pump, the lower the ?? or ??. The ratio is larger Condensate temperature. But it is influence on ?? or >>, the less ??, the far lower ?? or ?? 3. If the lower ??, ?? or ?? decrease by straight line and the higher condensate temperature, the ratio is larger. If ?? is 70℃, ?? become less 10% and ?? lower approximately 6%. But it is less then influence condensated temperature of steam tubine. 4. If partial of heat generated at heat pump condenser used at heat in Boiler feed water, the higher ?? or ??. If ?? is 50℃, ?? larger approximately 2.5%.
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尙熙善 慶一大學校 1990 論文集 Vol.6 No.1
Alumina, Zirconia, Silicon Nitride, Sillcon Carbide의 수직반사율과 확산반사율을 온도 300~700K및 0.45~32㎛의 파장역에서 측정하였다. 결과를 4유속 이론으로 해석하여, 열복사 성질을 결정, 함수화 하였다. 그 결과 임의의 온도, 파장에 있어서 열복사의 물성값이 계산 가능하게 되었고, 또한 Alumina를 코팅한 Hastelloy X의 수직복사율을 계산하여 나타내었다. Ceramics are sintered nonmetallic materials, and have excellent heat resisting properties, Radiations properties of nonmetallic materials are distinguished from those of metallic materials in the features. First, they are scattering and semitransparent media of radiation. The properties are caused by the nonhomogeneous structure and the low electric conductivity. Second, in the case of ceramics, atomic properties are important rather than electric properties. Storong absorption bands of lattice vibration are observed in the infrared region. This study is to develop a model for Heat transfer of porous ceramics material. Heat transfer model was proposed, considering both the conduction and radiation. These experimental results were satisfactorily correlated by the proposed Heat transfer model. This study describes one approach to predicting radiative heat flux in ceramics material. The spectral extinction coefficients and scattering albedo in the wave length 0.45~30㎛ were determined from results of optical transmission and reflection measurements. Spectra of diffuse and specular reflectance of Alumina, Zirconia, Silicon nitride and Silicon Carbide are measured in the temperature range from room temperature to 1300℃. The spectra are analyzed on the basis of a isotropic scattering theory and a dielectric theory of lattice vibration. Quantitative expression of radiation properties are obtained for the heat transfer estimation.
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상희선 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
The flow of a viscous fluid on the outside of a horizontal rotating drum partially submerged on the fluid, has many instances of interesting practical application. The purpose of this paper a well rounded set up theoretical and experimental results for a set of parameters with in the range of interest of coating processes.
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自家發電 Steam turbine의 部分 低負荷에서 效率向上에 對한 考察
尙凞善 慶北工業專門大學 1980 論文集 Vol.17 No.-
The improvement in efficiency of Steam turbine on one's own house an independent electric power plant at part low load, at the heat cycle include Boiler. and many point the improvement in efficiency at the turbine single element depend on close cooperation by the maker side. According if we put on end to it as a result of so far discussed study, the following table become manifest effect. ─────────────────────────────────── No Item Rate of increased Remark efficiency ─────────────────────────────────── 1 Section load 2.0∼3.0% The more increas of capacity, the curve rise slowly ─────────────────────────────────── 2 Amelioration of 0.5∼0.7% " blade part ─────────────────────────────────── 3 Administration of 2.0∼3.3% " condenser vacuum ─────────────────────────────────── 4 Modulation of valve 2.0∼0.8% " point and clear of scale ───────────────────────────────────
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