Determine how much heat can be stored in a 2-m³ storage space using granite rocks with a heat capacity of 2.32 kJ/kg-°C and a temperature change of 20°C. The density of granite is 2700 kg/m³.
Determine how much heat can be stored in a 2-m³ storage space using granite rocks with a heat capacity of 2.32 kJ/kg-°C and a temperature change of 20°C. The density of granite is 2700 kg/m³.
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In solar-heated buildings, energy is often stored as sensible heat in rocks, concrete, or water during the day for use
at night. To minimize the storage space, it is desirable to use a material that can store a large amount of heat
while experiencing a small temperature change. A large amount of heat can be stored essentially at constant
temperature during phase-change process, and thus materials that change phase at about room temperature such
as glaubers salt (sodium sulfate decahydrate), which has a melting point of 32°C and a heat of fusion of 329 kJ/L, are
very suitable for this purpose.
Determine how much heat can be stored in a 2-m3 storage space using granite rocks with a heat capacity of 2.32 kJ/kg-*C and a
temperature change of 20°C. The density of granite is 2700 kg/m³.
The heat stored is 250.56 kJ.
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