2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Thermal Sprayed Coatings For Heat Exchangers In Heat Storage Applications
Patrick Masset1; Sebastian Schuster1;1FRAUNHOFER UMSICHT, Sulzbach-Rosenberg, Germany (Deutschland);
Type of Paper: Regular
Id Paper: 375
Topic: 17
Abstract:
Heat storage has become a very important topic because of the renewable and alternative energy requests. Its availability and peak demand issues require more efficient and economic solutions for thermal energy storage at times when energy is not needed.
Phase Change Materials (PCMs) use the latent heat at the solid-liquid phase transition point for storing thermal energy. PCMs are commonly grouped in organic (e.g. paraffin waxes) and inorganic compounds (e.g. salt hydrates). Inorganic salt hydrate PCMs exhibit a number of advantages in comparison to organic PCMs (e.g. lower price, higher latent heat per unit volume, higher thermal conductivity). However, one of the main issues of inorganic PCMs is their insufficient long-term stability because they are corrosive to most common metals like aluminium, copper, brass, carbon steel.
Heat exchanger tubes are therefore often made of stainless steel. In this work we investigated the corrosion protection of several thermal sprayed coatings on carbon steel substrate. Thermal spraying is straight forward, fast, low-cost and easy to scale-up coating technique where almost all materials can be coated on almost every substrate materials.
In this work, the performance of several metal-based thermal sprayed coatings has been investigated and compared to bulk material properties of common heat exchanger materials. The immersion corrosion tests have been performed in presence of two inorganic salt hydrates, namely sodium acetate trihydrate and calcium chloride hexahydrate. The tests presented and evaluated were short-time tests (max. 6 weeks).
It was concluded that coatings offer an interesting and suitable alternative to protect heat exchanger materials for heat storage applications.