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잠열축열 장치를 갖춘 온실의 난방 열 특성 예측모형 개발
노정근(J.G.Ro),송현갑(H.K.Song) 한국태양에너지학회 2001 한국태양에너지학회 논문집 Vol.21 No.3
A greenhouse equipped with latent heat storage system was built to obtain various thermal properties, such as greenhouse air temperature, soil surface temperature, energy flow in latent heat storage, etc., which could be used in validation of greenhouse numerical model to be developed in this study. This numerical model expressed with Newton-Raphson method was programed by C-language and utilized to simulate greenhouse thermal behavior. Greenhouse air temperature and soil surface temperature predicted by the greenhouse model developed in this study were very close to the measured data obtained through almost 3 years of experiment. Therefore, it is concluded that the greenhouse model developed and verified by measured data could be utilized for simulating various thermal behaviors of greenhouses equipped with latent heat storage system to be used for energy saving purposes.
냉축열을 위한 H₂O - NaCl 혼합물의 상변화 온도와 잠열 특성분석
송현갑(H. K. Song),노정근(J. G. Ro) 한국태양에너지학회 1999 한국태양에너지학회 학술대회논문집 Vol.- No.-
H₂O-NaCl혼합물을 냉축열재로 선택하였으며, 이 혼합물의 상변온도를 물농도 변화에 의하여 조절하였다. 그리고 고농도와 저농도의 NaCl과 H₂O가 Ion-dipole interaction으로 결합하는 구조를 그림으로 가시화하고 가열, 냉각과정에서 H₂O-NaCl이 동결, 융해하는 현상을 도시하므로서 융해와 동결과정에서 상변화온도가 2단계로 나타나는 구조적 원인을 구명하였으며, NaCl의 농도변화에 따른 상변온도를 이론적으로 분석하므로서 실험 및 이론분석 결과의 타당성을 증명할 수 있도록 하였다. In this study H₂O-NaCl mixture was selected as the thermal storage material and it's phase change temperature(liquid⇔solid) was controlled with the molar concentration of Nacl.<br/> Ion dipole interaction mechanism and the fusion and crystallization structure of H₂O-NaCl were visualized with the low and high concentration of NaCl in the heating and cooling processes.<br/> The original cause of the appearance of two steps phase change period in each process was found by the visualization of the ion dipole interaction mechanism of H₂O-NaCl, and the theoretical model of the phase change temperature variation with the NaCl molar concentration was developed.
냉축열을 위한 H₂O-NaCl 혼합물의 상변화 온도와 잠열 특성분석
송현갑(H.K.Song),노정근(J.G.Ro) 한국태양에너지학회 1999 한국태양에너지학회 논문집 Vol.19 No.2
H₂0-NaCl혼합물을 냉축열재로 선택하였으며, 이 혼합물의 상변화온도를 몰농도 변화에 의하여 조절하였다. 그리고 고농도와 저농도의 NaCl과 H₂0가 ion-dipole interaction으로 결합하는 구조를 그림으로 가시화하고 가열, 냉각과정에서 H₂0-NaCl이 동결, 융해하는 현상을 도시하므로서 융해와 동결과정에서 상변화온도가 2단계로 나타나는 구조적 원인을 구명하였으며, NaCl의 농도변화에 따른 상변화온도를 이론적으로 분석하므로서 실험 및 이론분석 결과의 타당성을 증명할 수 있도록 하였다. In this study H₂0-NaCl mixture was selected as a cold thermal storage material and its phase change temperature(liquid>solid) was controlled with the molar concentration of NaCl.<br/> Ion dipole interaction mechanism and the fusion and crystallization structure of H₂O-NaCl were visualized' with the low and high concentration of NaCl in the heating and cooling processes.<br/> In this study, the original cause of the appearance of two steps phase change period in heating and cooing processes were found by the visualization of the ion dipole interaction mechanism of H₂O- NaCl, and the theoretical equation of the phase change temperature variation in the NaCl high molar concentration was rearranged.
송현갑(H. K Song),유영선(Y. S. Ryou),노정근(J. G. Ro) 한국태양에너지학회 1998 한국태양에너지학회 학술대회논문집 Vol.- No.-
온축열재로 물성을 안정시켜 개발한 Na₂SO₄ㆍ10H₂O와 H₂O의 상변화 용도를 냉축열온도로 하향조절하여, 냉축열재로 활용할 수 있도록 잠열재의 상변화 온도조절기법을 실험적으로 확인하고, 온도조절과 상변화 사이클이 냉축열 특성에 미치는 영향을 실험적으로 분석하였다. In order to utilize Na₂SO₄ㆍ10H₂O and H₂O as clod thermal storage media, the theory of Phase Change Temperature Control (PCTC) and the crystallization model of PCM were suggested, and the phase change temperature of the PCM could be controlled bellow 0℃ with the PCTC theory.<br/> And the effect of PCTC and the phase change cycle on .the cold thermal storage characteristics of PCM was experimentally analysed.