High-Temperature Phase Change Materials (PCM) Candidates for Thermal Energy Storage (TES) Applications

Gomez, J. C.

关键词: ALLOYS;    CONTAINERS;    ENERGY DENSITY;    ENERGY SOURCES;    ENERGY STORAGE;    ENERGY SUPPLIES;    MOLTEN SALTS;    PHASE CHANGE MATERIALS;    PHASE TRANSFORMATIONS;    PHYSICAL PROPERTIES;    POWER PLANTS;    STABILITY;    TRANSFORMATIONS CONCENTRATING SOLAR POWER;    CSP;    THERMAL ENERGY STORAGE;    TES;    LATENT HEAT;    PHASE CHANGE MATERIAL;    PCM;    PHASE CHANGE TRANSFORMATION TEMPERATURES;    MELTING POINT;    Solar Energy - Thermal;   

DOI  :  10.2172/1024524
RP-ID  :  NREL/TP-5500-51446
PID  :  OSTI ID: 1024524
Others  :  TRN: US201120%%47

美国|英语

来源: SciTech Connect

【 摘 要 】

It is clearly understood that lower overall costs are a key factor to make renewable energy technologies competitive with traditional energy sources. Energy storage technology is one path to increase the value and reduce the cost of all renewable energy supplies. Concentrating solar power (CSP) technologies have the ability to dispatch electrical output to match peak demand periods by employing thermal energy storage (TES). Energy storage technologies require efficient materials with high energy density. Latent heat TES systems using phase change material (PCM) are useful because of their ability to charge and discharge a large amount of heat from a small mass at constant temperature during a phase transformation like melting-solidification. PCM technology relies on the energy absorption/liberation of the latent heat during a physical transformation. The main objective of this report is to provide an assessment of molten salts and metallic alloys proposed as candidate PCMs for TES applications, particularly in solar parabolic trough electrical power plants at a temperature range from 300..deg..C to 500..deg.. C. The physical properties most relevant for PCMs service were reviewed from the candidate selection list. Some of the PCM candidates were characterized for: chemical stability with some container materials; phase change transformation temperatures; and latent heats.