S0805-1-3 流下液膜および水面下での伝熱管外面管外熱伝達係数の測定(高効率ヒートポンプの要素技術とその応用)

概要

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This paper reports the development of a steam generator in case of low temperature difference between generated steam and heat resources. A steam generator was designed employing a method of vaporization using falling films on evaporation tubes. The tubes were set in a steam generating chamber with a layout of three lines and twenty layers. An electric heater was equipped in each of the tubes as a heat source. While water was fallen on the surface of tubes and evaporated, temperatures of the surfaces and steam were measured. Mother experiment of vaporization by pool boiling was also carried out. As a result, the heat transmission coefficient of the surface evaporation was the largest under the condition of low heat flux. On the other hand, deterioration of the heat transmission coefficient was observed under a condition of high heat flux. Considering these experimental results, development requirements and possibility of the steam generator will be discussed.
社団法人日本機械学会の論文
2009-09-12