F-0942 減圧・蓄熱式電気温水器のサブクール核沸騰時に生じる凝縮振動音の低減化(G10-8 制音・制振)(G10 機械力学・計測制御部門一般講演)

概要

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On the use of a regenerative and vacuum-electric boiler, the subcooling boiling appears under the low pressure accompanied with a big metallic noise caused by the rapid collapse of bubble. Since the sound level strongly decreases as the degree of subcooling decrease, it is supposed that bubble dynamics closely related with the liquid subcooling around the heater. In this experiment, measurements of sound level with a microphone and observations of bubble behavior with a high-speed camera are performed in some condition of liquid subcooling, to clarify the characteristic of such noise. In order to control the degree of subcooling, it is proposed to regulate the temperature around the heater by controlling a valve equipped at lower part of cylindrical cover over the heater. It could be clear that the temperature control keeping the liquid subcooling around the heater 2K is effective for the noise reduction.
一般社団法人日本機械学会の論文
2001-08-22