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Question: energy storage is necessary to for example allow solarderived electricity...

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Energy storage is necessary to, for example, allow solar-derived electricity to be generated around the clock. For a given mass of storage medium, show that the ratio of sensible thermal energy storage capacity to potential energy storage capacity may be expressed as

R = DEst,t = cDT DEst,PE gz

where DT is the difference between the maximum and minimum temperatures associated with thermal energy storage, c is the specific heat, and z is the vertical coor- dinate for potential energy storage. Considering stone mix concrete as the storage medium, determine the value of R for DT = 100°C and z = 100 m. Which energy storage approach, thermal or potential, is more effective for the parameters of this problem?

1.28Energy storage is necessary to, for example, allow solar-derived electricity to be generatedaround the clock. For a given mass of storage medium, show that the ratio of sensible thermal energy storage capacity to potential energy storage capacity mav be expressed as AE CAT st,t st,PE where is the difference between the maximum and minimum temperatures associated with thermal energy storage, c is the specific heat, and z is the vertical coor- dinate for potential energy storage. Considering stone mix concrete as the storage medium, determine the

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