You can also have a temperature cycle of 600C with dirt. Water is limited to 50-... | Hacker News

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		ted_dunning 5 months ago \| parent \| context \| favorite \| on: Standard Thermal: Energy Storage 500x Cheaper Than... You can also have a temperature cycle of 600C with dirt. Water is limited to 50-70C so the dirt loses a factor of 4 in specific heat, but wins back a factor of 10 due to delta T. The net is dirt wins by a factor of 2.5.

pfdietz 5 months ago [–]

The thermal conductivity of rocks (and, I presume, soils) also typically declines as temperature increases, falling by a factor of 2 or 3 at 600 C.

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