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        裵信徹,柳秀烈 단국대학교 1994 論文集 Vol.28 No.-

        One way of reducing radiant heat transfer between surfaces is to use the shields which are made from highly reflective or lowly emissivitive materials. In this study, the surface temperature of tube type furnace and the radiation shields were measured in the vacuum bell-jar. The tube type furnace was made by stainless steel 304 foil with 0.03 mm and 0.05 mm. The experimental data were compared with theoretical results. Since the heat convection effects can be neglected due to experiment in vaccum chamber, and the heat conduction effects can be also neglected due to very thin the thickness of specimen, there are only the radiative heat transfer. To find the effect of shield numbers, the electric furnaces with the one to five shields were made. As the results, the energy consumption decrease as increasing the number of shields, and using lower emissivitive material. To determine the position placing the specimen for measuring the thermophysical properties, the surface temperature distribution in axial direction was measured and compared with theoretical results. Since the errors among the experimental and theoretical data were changed in the range of ±5%, the accuracy of the present method was verified. Although the maximum temperature of the furnace rise as increasing shield number, since the difficulties and tedious job in manufacturing the furnace with more numbers of shield beyond the arailability of the reducing the energy consumptions, the use of two or three shields can be recommended. Also it was found that the specimen should be placed in 52.2% midsection in axial length of the furnace, and the maximum temperature difference between the end and midsection of the furnace was 20 degree under the present condition.

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