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박진구 대한설비공학회 2003 설비공학 논문집 Vol.15 No.2
Optimization for the insulation thickness and external shape of a household refrigerator is peformed in order to minimize thermal load through the insulation wall. The one dimensional conduction heat transfer model is adopted to calculate thermal load. Calculus of variation is employed to optimize the thickness and shape of refrigerator or freezer. The uniform distribution of an insulation thickness and cubed external shape make thermal load minimize. Finally, by using both of the computational and experimental method, the thermal load is minimized for a refrigerator/freezer. It is shown that there exists optimal thickness of insulation walls and external shape for given the external cabinet dimensions and freezer and refrigerator internal volumes, Also, the analytical results are well agreed with the experimental results.
박진구,송영상,김종길,김호건 한양대학교 이학기술연구소 2005 이학기술연구지 Vol.8 No.-
TEOS(tetrethyl orthosilicate)로 부터 제조된 구형의 SiO_(2) 미립자를 TiOCl_(2) 수용액과 반응시켜 SiO_(2) 표면에 10~20㎚ 두께의 균일한 TiO_(2)막이 형성된 TiO_(2)-SiO_(2) 복합미립자를 합성하였다. X-선 회절 분석결과 합성초기의 복합체 TiO_(2)는 비정질 상태이지만 700℃이상의 열처리에 의하여 anatase결정상이 나타났고 900℃이상에서 rutile결정상으로 전이됨을 확인하였다. TiO_(2)-SiO_(2) composite particle in which the homogeneous TiO_(2) layer with width of 10~20㎚ was formed on the SiO_(2) surface by the reaciton of the spherical SiO_(2) particale in TiOCl_(2) solution As the resulte of XRD analysis the phase of TiO_(2) coated on SiO_(2) sphere was noncrystalline state however it was changed to anatase crystal state by heating at 700℃and th anatase phase was transfomed to reile phase at the aboce 900℃