Performance Evaluation of Various Kinds of Heat Exchangers by Using Water Solutions with Flow Drag Reduction Surfactant

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  • 流動抵抗低減剤添加水を熱媒体とした各種熱交換器の性能評価
  • リュウドウ テイコウ テイゲンザイ テンカスイ オ ネツバイタイ ト シタ カクシュ ネツコウカンキ ノ セイノウ ヒョウカ

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Abstract

A flow resistance of flow drag reduction surfactant water solutions could be reduced considerably by adding a small amount of the surfactant to the heat transfer fluid. And surfactants also lead to reduced overall heat transfer coefficient compared to those of pure water, too. So a recent application of drag reduction effect is to reduce the pumping power in the district heating and cooling systems. However, most of the previous experimental studies of drag reduction effect have been confined to straight pipelines. In this paper, the flow and heat transfer characteristics of water solution with the surfactant flowing in a shell tube type and plate heat exchangers have been measured under various experimental conditions of mean velocity and solution temperature. And it was found that the flow resistance and heat transfer of the surfactant water solution flow in these heat exchangers were greater than those in the straight pipes. However, the flow drag reduction rate and the modified Reynolds range in the plate type heat exchanger were less than those in the shell tube type heat exchanger. And in the plate type heat exchanger, the heat transfer reduction rate was greater than the flow drag reduction effect. The performance of these exchangers have been evaluated by investigating both the temperature efficiency and the pumping power rate.

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