Thermal Mass

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  • 830J/kgC specific heat of sand.
  • 830kJ/tonC. Assume a 140 to 90F drop, or 30C.
  • 25,000kJ/ton30C
  • 25MJ/ton of storage for normal conditions.
  • Sand weighs 1.3 ton/cubic yard
  • 32 MJ/yard
  • Wood is 16MJ/kg
  • Equivalent heat of 2 kg of wood
  • 3 cubic yards are 6 kg of wood.
  • Conductivity of sand - .25W/MK.
  • 4.186J/gC° specific heat of water.