Does the common salt store around 300 kwh/m3 melting/solidifying?

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Mrhy24

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In my chemistry book the value of the heat of fusion of the common salt, NaCl, is around 30 kj/mol(around 300 kwh/m3...).
It's possible to use it to store the heat of the sun during the day for example. So it's perfect, the temperature is constant and electric energy can be produced when we need...

Firstly, is the value of the heat of fusion of my chemistry book correct?
Is my idea feasible? I don't know if it's not possible because of the high temperature (thermal radiation in the vacuum, materials, etc...).
 
It seems really OK and especially... doesn't seem too costly !

My book value is 27,2 kj/mol.
The real problem seems to be only thermal insulation...
 
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