Thermal Mass: Difference between revisions
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=Effectiveness of Materials= | =Effectiveness of Materials for Seasonal Heat Storage= | ||
Water is the most robust, bulk heat storage medium, 5x the specific heat capacity of rock - and 2.5 the heat capacity by volume since rock is more dense than water (rocks sink). | Water is the most robust, bulk heat storage medium, 5x the specific heat capacity of rock - and 2.5 the heat capacity by volume since rock is more dense than water (rocks sink). | ||
Revision as of 01:16, 17 December 2020
Effectiveness of Materials for Seasonal Heat Storage
Water is the most robust, bulk heat storage medium, 5x the specific heat capacity of rock - and 2.5 the heat capacity by volume since rock is more dense than water (rocks sink).
A practical storage medium could thus be rock/water mix, where the water has good heat exchange qualities. This is for seasonal storage.
Notes
- 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.