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Development of a Dynamic Fouling Model for a Heat Exchanger
Zahid, Khayyam Patel, Rajnikant
Zahid, Khayyam
Patel, Rajnikant
Publication Date
2016
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Abstract
Fouling in heat exchangers (HE) is a major problem in industry and accurate prediction of the onset or degree
of fouling would be of a huge benefit to the operators. Modelling of the fouling phenomenon however, remains
a challenging field of study. Cleaning of heat exchangers, coulpled with the down time, is a financial burden
and for industrialized nations and costs can reach to almost 0.25 % of the country’s Gross National Product
(Pritchard, 1988).This work presents the development of a dynamic fouling model based on experimental data
collected using a laboratory concentric tube heat exchanger handling a saline system. Heat transfer
coefficients were obtained from first principles as well as from either the Sieder-Tate or Petukhov-Kirillov
correlations modified by Gnielinski depending on the flow regime. The outlet temperatures were calculated
using the Effectiveness-NTU method. The dynamic fouling factor was based on the Kern and Seaton fouling
model and validation was completed by comparing the experimental outlet temperatures with those predicted
by the model. The model predicts the outlet temperatures with an average discrepancy of 1.6 °C and 0.4 °C
for the cold and hot streams respectively.
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Citation
Zahid K, Patel R and Mujtaba IM ( 2016) Development of a Dynamic Fouling Model for a Heat Exchanger. Chemical Engineering Transactions. 52 (1135).
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