Departmental Bulletin Paper 湯沸し鍋の温度測定と伝熱促進
ユワカシナベ ノ オンド ソクテイ ト デンネツ ソクシン
Temperature measurement of a pot with water for boiling and heat transfer enhancement

柳原, 敬志  ,  田中, 裕貴  ,  稲岡, 恭二  ,  千田, 衞  ,  ヤナギハラ, タカシ  ,  タナカ, ヒロキ  ,  イナオカ, キョウジ  ,  センダ, マモル  ,  Yanagihara, Takashi  ,  Tanaka, Hiroki  ,  Inaoka, Kyoji  ,  Senda, Mamoru

57 ( 1 )  , pp.34 - 40 , 2016-04-30 , 同志社大学ハリス理化学研究所 , Transcription:ドウシシャ ダイガク ハリス リカガク ケンキュウジョ , Alternative:Harris Science Research Institute of Doshisha University
Heat transfer experiments have been conducted for a boiling water process of a pot heated by a cartridge-type gas stove. To grasp the basic heat transfer phenomena of the heating process of the boiling pot, time variation of the water temperature, total boiling time of the water, and amounts of heat including the heat transferred to the pot material, water and exhaust gas were respectively measured. In order to enhance the heat transfer from the hot gas into the water, measurements have also done for the cases when extended fin surfaces have been attached on the hot gas side of the bottom surface of the pot. Two types of material of the pot, stainless steel and aluminum, were examined. Three types of fins having different heat transfer areas and arrangements were also tested. It was found from the heat balance analysis that 46% of the heat supplied by the hot gas was used for boiling the water and 52% of the heat was wasted as exhaust gases flowing toward the side of the pot. As a result, about 420 seconds were required to boil two-liter water for the normal pot without fins and no dependency was found in the boiling time for the different pot materials. It was also revealed that the treated fins can enhance the heat transfer from the hot gas into the water. From the heat balance analysis, 67% of the heat was utilized for boiling the water in the maximum area case. This heat transfer enhancement caused about 30% shorter boiling time compared to the time of the normal pot without fins, hence, about 30% energy saving was achieved by introducing the extended surfaces in this study.

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