Table 1 The properties of different energy storage materials56,57.

From: Maximizing solar distillation performance for conical solar still through varied energy storage materials

Energy storage materials

Material

Glass balls

Stainless steel balls

Sand stones

Black gravel

Thermal conductivity, W/m.K

6.0

15

1.83

0.55

Heat capacity, J/kg.K

840

500

920

518

Density, kg/m3

3210

7900

2323

1960

Melting point, °C

610

1510

1650

1200

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