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Question 8

Two methods of storing surplus electricity from a wind farm are being compared:

  • Method A (Thermal Storage): Heating a specialized storage medium.

    • Energy stored per 100 kg100\text{ kg}100 kg of medium = 40,000 kJ40,000\text{ kJ}40,000 kJ
    • Percentage of stored energy wasted = 35%35\%35%

  • Method B (Gravitational Storage): Pumping mass up a vertical shaft.

    • Energy stored per 100 kg100\text{ kg}100 kg of mass = 800 kJ800\text{ kJ}800 kJ
    • Percentage of stored energy wasted = 15%15\%15%

Calculate the difference in the useful energy retrieved (in kJ\text{kJ}kJ) from 100 kg100\text{ kg}100 kg of storage material between Method A and Method B.

[5]
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1 Energy Questions

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