• Journal of the Korean Society for Precision Engineering
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• v.13 no.8
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• pp.72-79
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• 1996

In a BAF(Batch Annealing Furnace), various studies have been pursued in order to reduce energy consumption rate to improve productivity and to stabilize the properties of products. The purpose of this study was to investigate the effects of both the atmospheric gas and convector plate shapes on the augmentation of heat transfer. The use of hydrogen instead of nitrogen as an atmospheric gas, combined with high convection in the BAF, has shown that considerable increases in furnace out put and significantly improved material quality are attainable. Because convector plate shapes make the atmosheric gas easily flow density, high diffusivity and reducing character of hydrogen, a better heat transfer rates resulting in uniform material temperature distribution and improved coil surface quality can be achieved. Also, it was found that the closed convector plate took more time for the annealing cycle time than the other plate type(open-type)by about ten hours.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2003.11a
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• pp.41-46
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• 2003

In recent days, it is usual case to extend the dwelling area to the balcony which is provided by service area. But the use of the extended area can be arisen discomfort with a view point of thermal environment by excessive heat accumulation in summer and excessive cold draft in winter. In this study, the skills were reviewed to improve the thermal environment of the extended area and evaluations were carried out. Additional heat supply by heat-convector installed at the lower end of the curtain wall can improve the thermal environment of the extended area and also arise surface temperature of the curtain wall surface. And aluminum plate installed under the floor could not improve the thermal environment but it was effective to shortening the initial heating time.