Department of Nautical Sciences and Marine Systems Engineering, University of the Basque Country UPV/EHU, Portugalete, Spain.
Department of Sciences & Techniques of Navigation and Ship Construction, University of Cantabria, Santander, Spain.
Biofouling. 2020 Jan;36(1):73-85. doi: 10.1080/08927014.2020.1715954. Epub 2020 Jan 27.
A CUSUM chart method is presented as an alternative tool for continuous monitoring of an electromagnetic field-based (EMF) antifouling (AF) treatment of a heat exchanger cooled by seawater. During an initial experimental phase, biofilm growth was allowed in a heat exchanger formed of four tubes until sufficient growth had been established. In two of the tubes, continuous EMF treatment was then applied. The heat transfer resistance and heat duty (heat transfer per unit time) results showed that biofilm adhesion was reduced by the EMF treatment. EMF treatments resulted in a 35% improvement in the heat transfer resistance values. The proposed CUSUM chart method showed that the EMF treatment increased the useful life of the heat exchanger by ∼20 days. Thus, CUSUM charts proved to be an efficient tool for continuous monitoring of an AF treatment using data collected online and can also be used to reduce operation and maintenance costs.
提出了一种累积和（CUSUM）图方法，作为一种替代工具，用于对基于电磁场（EMF）的防污（AF）处理持续进行连续监测，该处理用于冷却海水的热交换器。在初始实验阶段，允许在由四个管组成的热交换器中生长生物膜，直到建立了足够的生长。然后，在其中两个管中连续施加 EMF 处理。传热阻力和热负荷（单位时间的传热）结果表明，EMF 处理减少了生物膜的粘附。EMF 处理使传热阻力值提高了 35％。提出的 CUSUM 图方法表明，EMF 处理使热交换器的有效使用寿命延长了约 20 天。因此，CUSUM 图被证明是一种有效的工具，可用于使用在线收集的数据对 AF 处理进行连续监测，并且还可以用于降低运营和维护成本。
