Abstract
The National Renewable Energy Laboratory is developing a thermal energy storage (TES) system that uses solid particles as the storage medium for a concentrating solar power plant. This paper focuses on the particle-TES performance in terms of three efficiency metrics: first-law efficiency, second-law efficiency, and storage effectiveness. The paper presents the derivation of the efficiency expression and their application in assessing the particle-TES performance and design. The particle-TES system uses low-cost stable materials that withstand high temperature at a fraction of the cost of the salt and metal containment vessels for high-temperature TES. Cost analysis indicates that particle TES costs less than $10/kWhth, which is less than half the cost of the current molten-salt-based TES and just a fraction of liquid heat transfer fluid storage at a similar high temperature of >700°C, due to its low cost of storage medium and containment. The fluidized-bed TES can hold hot particles of > 800°C with >95% exergetic efficiency, storage effectiveness, and thermal efficiency.
Original language | American English |
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Pages | 898-907 |
Number of pages | 10 |
DOIs | |
State | Published - 2014 |
Event | International Conference on Solar Power and Chemical Energy Systems, SolarPACES 2013 - Las Vegas, NV, United States Duration: 17 Sep 2013 → 20 Sep 2013 |
Conference
Conference | International Conference on Solar Power and Chemical Energy Systems, SolarPACES 2013 |
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Country/Territory | United States |
City | Las Vegas, NV |
Period | 17/09/13 → 20/09/13 |
NREL Publication Number
- NREL/CP-5500-60400
Keywords
- Concentrating solar power
- Gas/solid two-phase flow
- Heat transfer fluid
- Thermal energy storage