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seifrob · 10-06-2016, 07:34 PM

The trouble is soil has 4 to 5 times lower thermal capacity (specific heat in english?) than water. You end with basement full of sand to store that heat.

How about to store the heat in melted wax? Its proven.

10-06-2016, 07:34 PM	#2 (permalink)
seifrob Permanent Lurker Join Date: May 2011 Location: Czechoslovakia (sort of), Europe Posts: 348 Dáčenka - '10 Dacia / Renault Logan MCV 1.5 dCi (X90 k9k) 90 day: 47.08 mpg (US) Thanks: 129 Thanked 198 Times in 92 Posts	The trouble is soil has 4 to 5 times lower thermal capacity (specific heat in english?) than water. You end with basement full of sand to store that heat. How about to store the heat in melted wax? Its proven.