Evaporation Heat Transfer of Ammonia/Water Mixtures for Plate Type Evaporator

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  • プレート式蒸発器のアンモニア/水平均蒸発熱伝達
  • プレートシキ ジョウハツキ ノ アンモニア ミズ ヘイキン ジョウハツ ネツ デンタツ

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Abstract

The performance test of plate type evaporators was carried out. Ammonia/Water mixtures were utilized as working fluid and warm water was utilized as heat source. Five kinds of ammonia mass fraction are tested. The overall heat transfer coefficient of ammonia/water mixtures was lower than the pure ammonia in the same experimental condition. In the convection dominant region, the mean evaporation heat transfer of ammonia/water mixtures was almost the same as ammonia by considering thermophysical properties. In the region where nucleate boiling contributes to the heat transfer, the mean evaporation heat transfer coefficient was influenced of mass fraction. An empirical correlation was proposed in order to predict the mean evaporation heat transfer coefficient of ammonia/water mixtures for plate type evaporators.

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