In two-tank direct thermal storage systems, the same fluid is used for both heat transfer and storage. Commonly used fluids in these systems include mineral oil and molten salt.
- Mineral Oil: This was often used in early parabolic trough power plants due to its good heat transfer properties and stability at high temperatures.
- Molten Salt: This is also widely used because it offers a high thermal capacity and can operate effectively at high temperatures, making it suitable for systems requiring prolonged thermal energy storage.
These fluids are ideal for systems where the same fluid can efficiently handle both heat transfer and storage.
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