The scope of this research is to obtain a film coating on stainless steel surfaces in order to reduce the interaction between the metal surface and the precipitates, so to mitigate fouling in heat exchangers. Perfuoropolyethers were used to obtain nano-range fluorinated layers in order to make hydrophobic the stainless steel surfaces. A pilot plant with two identical heat exchangers was built to investigate the ability of the hydrophobic coating of preventing fouling. The heat exchangers, installed in parallel, operated at the same temperature and pressure conditions, i.e. laminar flow regime and inlet flow temperatures of 291–293 K for cold streams and 313–333 K for hot streams. We compared the heat transfer performance of the two heat exchangers. After a five months operation the decrease in the heat transferred was 56% for the coated heat exchanger and 62% for the uncoated heat exchanger. Moreover, the increase of heat transfer resistance due to scale on the uncoated heat exchanger, with respect to the coated one, was three times higher.
Perfluoropolyethers coatings design for fouling reduction on heat transfer stainless steel surfaces / V. Oldani, C.L. Bianchi, S. Biella, C. Pirola, G. Cattaneo. - In: HEAT TRANSFER ENGINEERING. - ISSN 0145-7632. - 37:2(2015), pp. 210-219. [10.1080/01457632.2015.1044417]
Perfluoropolyethers coatings design for fouling reduction on heat transfer stainless steel surfaces
V. OldaniPrimo
;C.L. BianchiSecondo
;C. PirolaPenultimo
;
2015
Abstract
The scope of this research is to obtain a film coating on stainless steel surfaces in order to reduce the interaction between the metal surface and the precipitates, so to mitigate fouling in heat exchangers. Perfuoropolyethers were used to obtain nano-range fluorinated layers in order to make hydrophobic the stainless steel surfaces. A pilot plant with two identical heat exchangers was built to investigate the ability of the hydrophobic coating of preventing fouling. The heat exchangers, installed in parallel, operated at the same temperature and pressure conditions, i.e. laminar flow regime and inlet flow temperatures of 291–293 K for cold streams and 313–333 K for hot streams. We compared the heat transfer performance of the two heat exchangers. After a five months operation the decrease in the heat transferred was 56% for the coated heat exchanger and 62% for the uncoated heat exchanger. Moreover, the increase of heat transfer resistance due to scale on the uncoated heat exchanger, with respect to the coated one, was three times higher.File | Dimensione | Formato | |
---|---|---|---|
heat transfer engineering 2015 bis.pdf
accesso aperto
Tipologia:
Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione
805.41 kB
Formato
Adobe PDF
|
805.41 kB | Adobe PDF | Visualizza/Apri |
Perfluoropolyethers Coatings Design for Fouling Reduction on Heat Transfer Stainless Steel Surfaces.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
827.28 kB
Formato
Adobe PDF
|
827.28 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.