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신현준,서정윤,Shin, H.J.,Seo, J.Y. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.3
Thermosyphons are simple devices that can passively transport thermal energy over relatively large distance with little temperature degradation. Especially, the thermosyphon system requires no costly energy input and is completely maintenance free. These attributes permit the use of low grade thermal energy for thermal control of structures including the stabilization of highway foundations. This paper presents the experimental results of the snow melting system in which thermosyphon was utilized to ransfer the earth energy to the pavement to remove snow and ice. The test facility, three earth heated and one unheated test panels, is designed to investigate the variables associated with removing snow and ice from pavement surfaces. The results of these test show that the earth heated panel surface temperature is higher $2{\sim}6^{\circ}C$ than unheated panel when the ambient air temperature is $-7^{\circ}C$. The thermal performance of this earth source thermosyphon system for road heating showed that there was no snow on the heated test panels when the snowfall was 5cm average for the region.
신현준(H. J. Shin),양한주(H. J. Yang),오수철(S. C. Ohu) 한국자동차공학회 1982 오토저널 Vol.4 No.3
Heat transfer on packed bed is considered to be important for the effective designs of chemical reaction equipment, air conditioning system, and storage type heat exchanger, etc. Currently studies are being carried out quite actively in this field in order to increase the heat transfer effeciency.<br/> The effect of heat transfer is closely related to materials, shapes, porosities and packing states of packed bed as well as mutual dimensional relations between particles and the container. Investigation shows that heat transfer results appear to be influenced by such parameters as fluid velocity through packed bed, mass flow, and thermal properties. It is noted that viscosity is also considered to be an important factor in this problem.<br/> In this study, effective thermal conductivities on packed bed, effects of thermal conductivity (Ke) and friciton factor (Fk) according to change of porosity ( ε) and Reynolds number (Reh), and pressure loss of the fluid, are experimentally investigated.<br/> Results show that the effective thennal conductivity increases and the friction factor decreases, as against the increase of Reynolds number. But as the increase of porosity increase them both.