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  3. must answer a, b and c consider a pumped hydro sys

MUST ANSWER A, B and C Consider a pumped hydro system that is used for energy...

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Electrical Engineering

MUST ANSWER A, B and C

Consider a pumped hydro system that is used for energy storage.During off peak hours, excess electricity is used to pump water upto a storage reservoir. During peak demand periods the flow isreversed and electric power is generated by flowing the waterthrough a hydraulic turbine. The storage reservoir is 100 m abovethe hydro turbine/pump units and the hydraulic turbine canaccommodate up to 650 liters per second of flow.

3a) How much area would the pumped storagereservoir need to be to store 1000 MWh of hydro energy if itsaverage depth were 10 m? Express your answer in square meter. Isthis reasonable?

3b) Estimate the theoretical power (assume 100%efficiency) produced during the times that electricity isgenerated.

3c) If the roundtrip efficiency of the pumpedstorage unit is 75% (i.e., energy out/energy in), how much water (m3) must the reservoir hold to store the same 1000 MWh ofenergy?

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