> So, more heat capacity and less mass means lower cost per mwh.
Can you compare different technologies with these scaling laws? Also what are the limits of these approximations (e.g. taking temperatures to extremes tends to run into maintenance problems).
In this case the sand battery delivers 400 C steam from 600 C sand [0], via some heat exchange fluid (solar salt?) that flows next to the sand. Going through heating/cooling cycles can cause material issues, especially for larger temperature differences.
Can you compare different technologies with these scaling laws? Also what are the limits of these approximations (e.g. taking temperatures to extremes tends to run into maintenance problems).
In this case the sand battery delivers 400 C steam from 600 C sand [0], via some heat exchange fluid (solar salt?) that flows next to the sand. Going through heating/cooling cycles can cause material issues, especially for larger temperature differences.
[0] https://polarnightenergy.com/sand-battery/