Study on Heat Exchanger Effect utilizing Deep Sea Water

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  • 海洋深層水を用いた熱交換器性能に関する研究(熱輸送,熱工学部門一般講演)

Abstract

In the design of the several power plant systems, deep sea water (DSW) is used as the cooling water to increase the heat exchanger efficiency of the large scale power plant. DSW has useful characteristics such as purity effect, all season low temperature cooling water and rich nutrient. The objective of this study is to evaluate of heat exchanger effect utilizing DSW. Heat exchanger models were straight annulus tube type with cold sea water inner tube and hot water annular tube. In these experiments, DSW and surface sea water(SSW) was used for cooling water. Inner tube pressure loss and several positions temperature of heat exchanger were measured at long continuous operation, about one year. From these experimental results, pressure loss coefficient of SSW increased about 1.26 times compared with initial condition value. But pressure loss coefficient of DSW was almost equal to initial value. Therefore overall coefficient of heat transmission of SSW decreased about 0.70 times as initial condition value. But overall coefficient of heat transmission of DSW was hold near the initial level. The cause of pressure loss coefficient increase phenomenon and overall coefficient of heat transmission decrease phenomenon under SSW cooling condition are regarded as inner tube attachment dirt. It was confirmed that using purity DSW for heat exchanger was more effective.

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