Heat is stored in 2 m3 granite by heating it from 20 oC to 40 oC. The denisty of granite is 2400 kg/m3 and the specific heat of granite is 790 J/kgoC. The thermal heat energy stored in the granite can be calculated as
q = (2 m3) (2400 kg/m3) (790 J/kgoC) ((40 oC) - (20 oC))
= 75840 kJ
qkWh = (75840 kJ) / (3600 s/h)
= 21 kWh
The heat required to to heat 1 pound of water by 1 degree Fahrenheit when specific heat of water is 1.0 Btu/lboF can be calculated as
q = (1 lb) (1.0 Btu/lboF) (1 oF)
= 1 Btu
This calculator can be used to calculate amount of thermal energy stored in a substance. The calculator can be used for both SI or Imperial units as long as the use of units are consistent.
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