Corrosion testing of metals in contact with calcium chloride hexahydrate used for thermal energy storage. Issue 10 (7th July 2017) - Ren, S. J.
Abstract : Thermal energy storage (TES) using a phase change material (PCM) has been proposed as a supplemental cooling system to improve the performance of power plant air‐cooled condensers (ACCs). In this proposed system, frozen PCM would remove heat from plant's condensing steam during the day, which would melt the PCM. The PCM would be frozen at night as its stored heat is rejected to the cooler atmosphere. Calcium chloride hexahydrate (CaCl2 · 6H2 O) is an attractive material to serve as a PCM in this innovative system due to its appropriate melting temperature, low price, and relatively high latent heat of fusion. The corrosion of container materials is a major challenge in using CaCl2 · 6H2 O. Any material used needs to survive constant exposure to the salt for several years to ensure a long operational life for the system. In this study, the corrosion behavior of four metals in contact with CaCl2 · 6H2 O was experimentally investigated. Three different temperature conditions and two pH level conditions were considered under static metal exposure conditions. Abstract : Thermal energy storage using a phase change material has been proposed as a supplemental cooling system to improve the performance of power plant air‐cooled condensers. A study was carried out to investigate in the laboratory the corrosion behavior of four metals for encapsulation of CaCl2 · 6H2 O according to the ASTM‐G1 guideline. Three different temperatures and two different pH level conditions were investigated under static conditions.