Heat Transfer in Fire Resistance Furnaces - Experimental Investigation of the Variation of Heat Impact due to Furnace Construction and Control Thermocouples -

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  • 耐火試験炉内の熱伝達―炉の構造と制御用熱電対の差異に起因する加熱力の変動に関する実験―
  • タイカ シケンロ ナイ ノ ネツ デンタツ ロ ノ コウゾウ ト セイギョヨウ ネツデンツイ ノ サイ ニ キイン スル カネツリョク ノ ヘンドウ ニ カンスル ジッケン

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Abstract

To discuss the possibility to furnace harmonization, heat transfer in fire resistance furnaces was investigated experimentally. A standard calibration plate element (sandwich panel) was put in two different furnaces. One is lined with ceramic fiber, the other is lined with brick. The furnace temperature was controlled by three different thermocouples, i. e., sheath, steel tube and plate thermocouple. As a result of this series of experiments, six temperature measurements and heat flux measurements were obtained and discussed. In summary, (1) the heat impact on specimen is greatly influenced by thermocouple geometry. By using plate or tube thermocouples, the heat flux to the specimen is greatly increased in the beginning of fire test. (2) In case of specimens with small thermal inertia, plate and tube thermocouple control gives similar heat impact on the specimen. The difference between brick wall furnace and ceramic lined furnace is negligible. However the sheath thermocouple control gives much smaller impact on the specimen compared with tube and plate thermocouple control. (3) In case of specimens with large thermal inertia, tube thermocouple control gives the largest impact on the specimen, even compared with plate thermocouple control.

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