Question 11.7: An SHS storage system is required for a high-temperature CSP......

An SHS storage system is required for a high-temperature CSP plant that is operating as follows:

• CSP plant electric power output $P_{el}$ is 30 MW
• Overall (electrical) efficiency of the CSP power plant $\eta_{el}$ is 20%
• Energy storage duration $\tau$ is 6 h a day
• Storage medium is high-temperature concrete
• Storage medium temperature varies in a storage cycle from $t_{min}$ of 520°C to $t_{max}$ of 760°C
• Properties of storage medium: specific heat c = 0.9 kJ/kg K, density $\rho$ = 2400 kg/m³

Calculate (a) the required thermal capacity of the storage, (b) the storage energy density, and (c) the required mass and volume of storage material.