Basically salts only used to store temperature other than that what materials can be used that should be cost effective
Phase change materials (PCM) can b used to store the solar energy. In this case, the PCM material would be a solid that absorbs heat and become a melt. When the latter re-solidifies, it reject the absorbed heat.
Hope this helps answer your question.
Professor Yehia Khalil
Yale University
USA
Dear Brother,
Pebbles beds can be used to store the solar energy and you should arranged that pebbles beds setup intermediate of solar pond.
The salts are needed to, by virtue of their concentration gradient, maintain the temperature gradient (thermocline) in the pond. For storing heat withdrawn from the pond (i.e., exterior), a variety of strategies could be explored, including PCMs, sensible storage, etc. But improving the performance of the pond itself would require experimenting with different salts for improved halocline/thermocline maintenance or improving solar radiation absorption through using a higher absorptivity bottom material or a different thickness (volume) of water in the pond. Hope this helps!
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