ラジアントヒータを利用した間接加熱炉の非定常伝熱解析

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  • Unsteady heat transfer analysis of indirect heating furnace with radiant tube heaters.
  • ラジアント ヒータ オ リヨウシタ カンセツ カネツロ ノ ヒテイジョウ デン

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Experiments in heating of a hollow steel device and its theoretical analysis as an unsteady 3-dimensional combined heat transfer problem of radiation, convection and conduction were carried out for a full-size heat treatment furnace equipped with radiant tube heaters to establish a strict design method for industrial furnaces from the viewpoint of heat transfer.<BR>Experiments to clarify the difference in heating performance due to the input of heaters installed in the furnace and the emissivity of the device, both of which are very important factors in heat transfer design of the furnaces, were also conducted.<BR>The results of heating experiments and theoretical analysis coincide closely, and this theoretical analysis of the full-size furnace can simulate the heat transfer sufficiently well to become a basic design method. As for the emissivity of the device, low emissivity makes the radiant heat transfer small, which results in slow heating of the device, but it also accelerates the heating of the inner walls. It was confirmed that heating of the device becomes slow and its temperature becomes uniform if the input of the heaters is decreased.

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