海水冷却型プレート式熱交換器の生物汚損に関する研究 : 海水温度の影響

Experimental study of marine biofouling for the plate type heat exchanger with sea water cooling : Effect of sea water temperature

Creators Ichinose Junya

Creators Takami Tarou

Creators Nishida Tetsuya

Creators Inoue Norihiro

An equipment, with a plate heat exchanger, for testing seawater side fouling was operated for an extended period using seawater as the cooling heat source. The degradation of seawater side heat transfer performance with seasonal changes in seawater temperature was compared and examined. The following results were obtained: 1) The overall heat transfer coefficient decreased by 21.2% in winter and 21.9% in early summer compared to that at the start of the experiment. No significant difference was observed under the investigated experimental conditions. 2) The percentage increase in differential pressure was larger than that in overall heat transfer in both winter and early summer but the difference was still only a few kPa. 3) The estimated wall temperature at the seawater side was suitable for biological fouling in all seasons. 4) The fouling factor 30 days after the start of the experiment was 6.104×10^{-5}m^2 ・ K/W in winter and 7.01×10^{-5}m^2 ・ K/W in early summer.

[ISSN]0370-9361