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Abstract: Biofouling is an undesirable phenomenon in heat exchangers, which adheres slowly and progressively to the
inner surface of the tubes, results in a reduction of the heat transfer, and increases the operating and maintenance costs. Controlling this phenomenon is essential to ensure that the equipment operates under optimal conditions.
Different biofouling detection methods are currently available, depending on the properties of the fluid or by
means of intrusive elements in the process. In this paper, the validation of the CUSUM control graph as an
alternative technique to conventional detection methods is proposed. This type of graph is very efficient in the
early detection of slow and progressive changes within a process.
In a pilot plant, formed by two tubular heat exchangers, biofouling was allowed to grow until experimental
variables indicated that growth had occurred. The biofouling growth was monitored through the evolution of the heat transfer resistance Rf, which is a technique that has been widely validated for this purpose, and through the CUSUM control graphs.
The variable Rf, clearly indicates the different phases of growth. However, the evolution of this variable
depends on the physical-chemical characteristics and biological activity of water. The CUSUM graphs demonstrated a greater predictive capacity with regard to changes in the biological adherence process. Additionally, their results do not depend on the characteristics of water.
Fuente: Applied Thermal Engineering, 2019, 152, 24-31
Editorial: Elsevier Ltd
Fecha de publicación: 10/02/2019
Nº de páginas: 8
Tipo de publicación: Artículo de Revista
Url de la publicación: https://doi.org/10.1016/j.applthermaleng.2019.02.009
GOMEZ-SOLAETXE, MIGUEL ANGEL
SERGIO GARCIA GOMEZ
ALFREDO TRUEBA RUIZ