Fouling von Wärmeübertragungsflächen

Fouling of heat transfer surfaces . Fouling of heat transfer surfaces in industry causes considerable costs. Overcoming fouling is therefore essential for technical and economic reasons. Solution of the problems requires a better understanding of the physical, chemical and biological processes causing fouling. It is shown, that the prediction of the fouling behaviour of heat transfer equipment based on existing mathematical models is not jet satisfactory. This article presents a new physical model describing particulate and precipitation fouling based on the assumption of a deposition and a removal process. Experiments to prove the results of the theoretical considerations were carried out using an aqueous CaSO₄ solution. The test unit which is also suitable for in-situ measurements is described in detail. Measured and predicted asymptotic fouling factors agree with acceptable accuracy.