Abstract
Phase change materials (PCM) is one of the most interesting solutions to be used in thermal energy storage (TES) systems for direct steam generation (DSG) thermosolar facilities. Properties such as high energy density and energy storing/delivery at constant temperature bring PCM based systems in excellent candidates for DSG facility storage units. Accordingly, LiOH-KOH peritectic mixture, with a melting point of 315 °C and an enthalpy change of 535 kJ/kg, has been reported as attractive solution for the saturated storage module in DSG plants. A steam-PCM heat exchanger is the critical component to carry out the thermal transference between both substances. Although materials selection to be applied for steam applications is well known, lack of knowledge is detected in the field of high temperature hydroxides corrosion. Therefore, three metallic materials, A516 Gr70 carbon steel, A316L stainless steel and Inconel 625 Ni-base alloy, have been evaluated to determine their corrosion performance after hydroxides exposure. While A516 Gr70 was discarded for this application due to high corrosion rates, A316L and Inconel 625 displayed good corrosion resistance after 2640 h. Finally, A316L stainless steel was selected as potential candidate for the construction of the steam-PCM heat exchanger considering cost and thermal efficiency optimization.
| Original language | English |
|---|---|
| Pages (from-to) | 526-535 |
| Number of pages | 10 |
| Journal | Solar Energy Materials and Solar Cells |
| Volume | 159 |
| DOIs | |
| Publication status | Published - 1 Jan 2017 |
Keywords
- Corrosion
- Solar energy
- Direct steam generation (DSG)
- Thermal energy storage (TES)
- Phase change material (PCM)
- Hydroxides
Project and Funding Information
- Funding Info
- The research leading to these results has received funding from_x000D_ CDTI in the project Innterconecta Thesto (ITC-20111050). The work is_x000D_ partially funded by the Spanish Government (ENE2011-28269-C03-_x000D_ 02, ENE2011-22722, ENE2015-64117-C5-1-R, and ENE2015-64117-_x000D_ C5-2-R). The authors would like to thank the Catalan Government for_x000D_ the quality accreditation given to their research group GREA (2014_x000D_ SGR 123) and research group DIOPMA (2014 SGR 1543).