遠赤外放射加熱される下地のある平板状含水物の加熱特性に関する理論的考察

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Heating characteristics of water containing flat substance with an underlayer plate heated by long-wave infrared radiation and/or hot-air convection are analyzed on a simulated electrical resistance-capacitance network that is equivalent to a given thermal system. In the previous paper we presented analytical results for the case without underlayer plate S and, insted, with the rear surface of heated substance W thermally insulated. The present analysis assumes as before that only the surface of W is heated and that the substance is heated only by thermal conduction. It also assumes that the irradiated heat flow input, apart from the hot-air input, is constant and that W behaves like pure water. In addition to the general analysis, two representative cases W=1mm thick water, and S=10mm thick wood plate or 1mm thick steel plate are considered. Numerical calculations show that the temperature rises of W during a constant drying period are little affected compared with the previous insulated case, though temperature rises are greatly delayed due to thermal capacitance and resistance of S and accordingly much more so for the wood plate case. The theory and the analytical results were checked against published experimental numerical data. In the previous paper, we defined and introduced evaporation resistor γ_υ. Here, for the heating characteristics of W, the importance of the parameter, ratio of γ_υ to convection heat transfer resistor γ_h is explained. Taking advantage of the parameter, guide lines for designing an infrared system heating water containg substance W are added and fully explained.
社団法人照明学会の論文
1998-05-01

遠赤外放射加熱される下地のある平板状含水物の加熱特性に関する理論的考察

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