Quantifying the ‘implementation gap’ for antifouling coatings

• Published in: Applied thermal engineering Vol. 99; pp. 683 - 689
• Main Authors: Magens, Ole Mathis, Ishiyama, Edward M., Wilson, D. Ian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 25.04.2016
• Subjects: Antifouling coating; Antifouling coatings; Asymptotic; Asymptotic properties; Cleaning; Fouling; Heat exchangers; Pricing; Sensitivity analysis; Techno-economic analysis; Thermal engineering; Antifouling coating; Techno-economic analysis; Cleaning; Fouling; Asymptotic
• ISSN: 1359-4311
• DOI: 10.1016/j.applthermaleng.2016.01.087

•A techno-economic analysis of anti-fouling coatings to mitigate heat exchanger fouling is presented.•The scope of analysis covers an individual heat exchanger subject to asymptotic fouling with or without an induction period.•An approximate, explicit solution of the cleaning scheduling problem is presented.•The ‘value pricing’ concept is demonstrated for a case study where a PFPE coating was used to mitigate water scaling.•A sensitivity analysis identified when coating was attractive and where cleaning could be avoided. Fouling is a chronic problem in many heat transfer systems and leads to regular cleaning of heat exchangers. Antifouling coatings are one mitigation option: the financial attractiveness of installing a coated exchanger depends on trade-offs between capital and operating costs over the lifetime of the unit. Such considerations effectively set bounds on the price of coatings, bounded by manufacturing costs and the maximum saving that can be achieved from fouling mitigation, in a ‘value pricing’ calculation. The ‘value pricing’ concept is considered here, for the first time, for heat exchangers subject to asymptotic fouling. An explicit solution to the cleaning scheduling optimisation problem is presented for the case of equal heat capacity flow rates in a counter-current single phase exchanger. A case study is used to illustrate the concepts and key learnings. A sensitivity analysis identifies scenarios where the use of antifouling coatings may be attractive, and also where there is no financial benefit in cleaning a fouled exchanger.