A technique is disclosed for evaluating and monitoring performance of a
heat exchanger system. Operating parameters of the system are monitored
and fouling factors for heat transfer surfaces of the exchanger are
determined. Trending of fouling may be performed over time based upon the
fouling factors, and a model of fouling may be selected from known sets
of models, or a model may be developed or refined. Fluid treatment, such
as water treatment regimes may be taken into account in evaluation of
fouling. An automated knowledge based analysis algorithm may diagnose
possible caused of fouling based upon sensed and observed parameters and
conditions. Corrective actions may be suggested and the system controlled
to reduce, avoid or correct for detected fouling.